Patent Description:
Warehouses, distribution centers, and other material handling environments often rely on a number of components, systems, and the like for transporting products, articles, items, etc. to and from various locations within these environments. In some instances, human operators or users are responsible for picking, moving, and sorting these articles and may require assistance to identify articles for picking. The inventors have identified numerous deficiencies with these existing technologies in the field, the remedies for which are the subject of the embodiments described herein.

<CIT> discloses apparatus and methods for automatically interrogating a tagged object using radio frequency identification (RFID) when the object is moved.

<CIT> discloses a wearable motion sensor device with RFID tag.

<CIT> discloses methods and apparatus to determine in-aisle locations in monitored environments.

<CIT> discloses a user identification system.

<CIT> discloses a synthetic aperture RFID handheld with tag location capability.

As noted above, traditional warehouses and distribution centers may rely upon human operators to perform various tasks in these material handling environments. In some instances, these operators may be equipped with scanning devices configured to facilitate their actions by providing information (e.g., current location, item code, article destination, etc.) regarding tagged articles. For example, some operators employ barcode scanners configured to scan a barcode located on an article (e.g., item, product, etc.) that the operator intends to pick or otherwise handle. Barcode scanners, however, require line-of-sight (LOS) between the scanning device and the barcode located on the article in order to receive information (e.g., data) associated with this article. Radio-frequency identification (RFID) tags, however, operate using electromagnetic fields such that LOS between the RFID tag located on the article and the RFID scanner is unnecessary. Although RFID systems do not require LOS, an operator equipped with an RFID scanner may approach a plurality of articles in close proximity each of which include a respective RFID tag. As such, the RFID scanner of the operator may receive RFID tag data from the plurality of articles resulting in erroneous instructions to the operator.

To solve these issues and others, embodiments of the present invention utilize a first sensor attached to the RFID scanner and a second sensor separate from the RFID scanner (e.g., attached to a portable data terminal (PDT)) in order to accurately identify an intended RFID tag. Embodiments of the present invention employ accelerometers, gyroscopes, and related positional sensors in order to determine relative acceleration and tilt between a user's hand (e.g., supporting the RFID scanner) and the user's torso (e.g., supporting the PDT). The net rotation and net acceleration may be used to determine a pick operation (e.g., when a user grabs an item) and determine an intended RFID tag that corresponds with the pick operation. Furthermore, embodiments of the present invention also utilize time data and signal strength data associated with the received RFID tags in order to further improve the accuracy of intended RFID tag determinations. In doing so, such example implementations reliably identify intended RFID tags resulting in efficient operator workflows with reduced down time. The present invention is defined by the appended independent claims, to which reference should now be made. Specific embodiments are defined in the dependent claims.

According to an aspect of the present invention, there is provided a method for tag identification, the method comprising: receiving a stream of radio-frequency identification, RFID, tags, wherein each RFID tag is associated with a respective article; receiving first positional data from a first sensor associated with a user; receiving second positional data from a second sensor associated with the user and located separate from the first sensor; and determining an intended RFID tag from amongst the stream of RFID tags based upon the first positional data and the second positional data.

According to another aspect of the present invention, there is provided a scanning system comprising: a radio-frequency identification (RFID) scanner configured to receive a stream of RFID tags, wherein each RFID tag is associated with a respective article; a first sensor associated with a user and attached to the RFID scanner, and configured to generate first positional data; a second sensor associated with the user and positioned separate from the first sensor, and configured to generate second positional data; a computing device communicably coupled with the RFID scanner, the first sensor, and the second sensor; and configured to receive the stream of RFID tags, receive first positional data from the first sensor, receive second positional data from the second sensor; and determine an intended RFID tag from amongst the stream of RFID tags based upon the first positional data and the second positional data.

In some embodiments, in operation the first sensor is positioned on a user's hand.

In some embodiments, in operation the second sensor is positioned on the user's torso.

In some embodiments, the first positional data includes first rotational data associated with the user's hand, the second positional data includes second rotational data associated with the user's torso, and the computing device is further configured to: subtract the second rotational data from the first rotational data; determine a net rotation of the first sensor relative to the second sensor; determine a pick operation in an instance in which the net rotation satisfies a rotation threshold; and determine the intended RFID tag that corresponds with the pick operation.

In some embodiments, first positional data includes first acceleration data associated with the user's hand, the second positional data includes second acceleration data associated with the user's torso, and the computing device is further configured to: subtract the second acceleration data from the first acceleration data; determine a net acceleration of the first sensor relative to the second sensor; determine a pick operation in an instance in which the net acceleration satisfies an acceleration threshold; and determine the intended RFID tag that corresponds with the pick operation.

In some further embodiments, each RFID tag in the stream includes tag time data, the first positional data includes first time data, and the second positional data includes second time data, and the computing device is configured to: generate an intended time window based upon the tag time data; and analyze first positional data and second positional data having first time data and second time data, respectively, within the intended time window.

In some embodiments, the computing device is further configured to: analyze the intended RFID tag; and generate a user notification based upon the intended RFID tag.

In some embodiments, the computing device is further configured to: receive signal strength data for each RFID tag in the stream; and determine an intended RFID tag from amongst the stream of RFID tags based upon the first positional data, the second positional data, and the signal strength data.

It will be appreciated that the scope of the invention as defined by the appended claims encompasses many potential embodiments in addition to those here summarized, some of which will be further described below.

Reference will now be made to the accompanying drawings. The components illustrated in the figures may or may not be present in certain embodiments described herein. Some embodiments may include fewer (or more) components than those shown in the figures.

Some embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the inventions are shown. As used herein, the description may refer to a scanning system as an example "apparatus. " However, elements of the apparatus described herein may be equally applicable to the claimed method and computer program product.

As used herein, the terms "data," "content," "information," "electronic information," "signal," "command," and similar terms may be used interchangeably to refer to data capable of being transmitted, received, and/or stored in accordance with embodiments of the present invention. Further, where a first computing device is described herein to receive data from a second computing device, it will be appreciated that the data may be received directly from the second computing device or may be received indirectly via one or more intermediary computing devices, such as, for example, one or more servers, relays, routers, network access points, base stations, hosts, and/or the like, sometimes referred to herein as a "network. " Similarly, where a first computing device is described herein as sending data to a second computing device, it will be appreciated that the data may be sent directly to the second computing device or may be sent indirectly via one or more intermediary computing devices, such as, for example, one or more servers, remote servers, cloud-based servers (e.g., cloud utilities), relays, routers, network access points, base stations, hosts, and/or the like.

As used herein, the term "comprising" means including but not limited to and should be interpreted in the manner it is typically used in the patent context. Use of broader terms such as comprises, includes, and having should be understood to provide support for narrower terms such as consisting of, consisting essentially of, and comprised substantially of.

As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present invention. Thus, the particular feature, structure, or characteristic may be included in more than one embodiment of the present invention such that these phrases do not necessarily refer to the same embodiment.

As used herein, the word "example" is used herein to mean "serving as an example, instance, or illustration. " Any implementation described herein as "example" is not necessarily to be construed as preferred or advantageous over other implementations.

As used herein, the terms "scanning system," "scanner," "scanning device," and the like refer to devices and associated computer hardware that is configured (either physically or by the execution of software) to gather information from a tagged article. By way of example, the scanning system <NUM> of the present application may include a radio-frequency identification (RFID) scanner or reader configured to receive a stream of RFID tags each associated with a respective article. In some embodiments, the scanning system, scanner, or scanning device may include a "smart device" that is equipped with chip of other electronic device that is configured to communicate with a portable data terminal (PDT), computing device, or the like via Bluetooth, NFC, Wi-Fi, <NUM>, <NUM>, <NUM> protocols, and the like. In some embodiments, the RFID scanner may be configured to be worn attached to a user's hand <NUM> as illustrated in <FIG>.

As used herein, the term "portable data terminal (PDT)," refers to any object, device, or system which may be in network communication with the scanning device (e.g., RFID scanner) and/or the computing device <NUM> described hereafter. For example, the PDT may refer to a wireless electronic device configured to interact with various other devices that includes a data collection function (e.g., barcode or RFID reader data collection). The PDT may be configured to communicate with a RFID scanner, computing device, or the like via Bluetooth, NFC, Wi-Fi, <NUM>, <NUM>, <NUM> protocols, and the like.

As used herein, the term "computer-readable medium" refers to non-transitory storage hardware, non-transitory storage device or non-transitory computer system memory that may be accessed by a controller, a microcontroller, a computational system or a module of a computational system to encode thereon computer-executable instructions or software programs. A non-transitory "computer-readable medium" may be accessed by a computational system or a module of a computational system to retrieve and/or execute the computer-executable instructions or software programs encoded on the medium. Exemplary non-transitory computer-readable media may include, but are not limited to, one or more types of hardware memory, non-transitory tangible media (for example, one or more magnetic storage disks, one or more optical disks, one or more USB flash drives), computer system memory or random access memory (such as, DRAM, SRAM, EDO RAM), and the like.

Having set forth a series of definitions called-upon throughout this application, an example system architecture and example apparatus is described below for implementing example embodiments and features of the present invention.

With reference to <FIG>, an example scanning system <NUM> is illustrated with a RFID scanner <NUM> worn on a user's hand <NUM> and communicably connected via a network <NUM> to a portable data terminal (PDT) <NUM>, and a computing device <NUM>. Although the example scanning system <NUM> is illustrated connected via a network <NUM>, the present invention contemplates that, in some embodiments, the RFID scanner <NUM>, the PDT <NUM>, and/or the computing device <NUM> may be in direct connection (e.g., physically connected). Furthermore, the present invention contemplates that, in some embodiments, the RFID scanner <NUM> or the PDT <NUM> may comprise the computing device <NUM>, or a portion thereof.

The RFID scanner <NUM> may include circuitry, processors, chipsets, radio transponders, radio receivers, transmitters, and the like configured to receive RFID tag data from RFID tags located proximate the RFID scanner. In particular, the RFID scanner <NUM> may be configured to generate and transmit an electromagnetic interrogation pulse configured to cause proximate RFID tags to transmit RFID tag data to the RFID scanner <NUM>. The RFID scanner <NUM> may be configured to receive a stream of RFID tags (e.g., RFID tag data) where each RFID tag is associated with a respective article. Furthermore, the RFID scanner <NUM> may be configured to operate with passive RFID tags (e.g., RFID tags powered from the RFID scanner's interrogation pulse) as well as active RFID tags (e.g., RFID tags with independent power sources). Although illustrated affixed atop of a user's hand <NUM>, the RFID scanner <NUM> may also be configured to, in operation, attached to a user's palm, wrist, arm, or the like.

The RFID scanner <NUM> may further include first sensors (e.g., positional sensors) configured to generate first positional data. By way of example, the RFID scanner <NUM> may include one or more gyroscopes or other rotational sensors configured to generate first rotational data associated with the user's hand. The RFID scanner <NUM> may further include one or more accelerometers or equivalent sensors configured to generate first acceleration data associated with the user's hand. Although described herein with reference to gyroscopes and accelerometers, the present invention contemplates that the RFID scanner <NUM> may include any sensor (e.g., proximity sensors, position transducers, resolvers, encoders, rotary sensors, or the like) based upon the intended application of the sensing system <NUM>.

The PDT <NUM> may include second sensors (e.g., positional sensors) configured to generate second positional data in addition to circuitry needed to operably connect the PDT <NUM> with the RFID scanner <NUM>, and the computing device <NUM> as described above. By way of example, the PDT <NUM> may include one or more gyroscopes or other rotational sensors configured to generate second rotational data associated with the user's torso. The PDT <NUM> may further include one or more accelerometers or equivalent sensors configured to generate second acceleration data associated with the user's torso. Although described herein with reference to gyroscopes and accelerometers, the present invention contemplates that the PDT <NUM> may include any sensor (e.g., proximity sensors, position transducers, resolvers, encoders, rotary sensors, or the like) based upon the intended application of the sensing system <NUM>.

The computing device <NUM> may include circuitry, networked processors, or the like configured to perform some or all of the apparatus-based (e.g., scanning system-based) processes described herein, and may be any suitable processing device and/or network server. In this regard, the computing device <NUM> may be embodied by any of a variety of devices. For example, the computing device <NUM> may be configured to receive/transmit data (e.g., RFID tag data, first positional data, and/or second positional data) and may include any of a variety of fixed terminals, such as a server, desktop, or kiosk, or it may comprise any of a variety of mobile terminals, such as a portable digital assistant (PDA), mobile telephone, smartphone, laptop computer, tablet computer, or in some embodiments, a peripheral device that connects to one or more fixed or mobile terminals. Example embodiments contemplated herein may have various form factors and designs but will nevertheless include at least the components illustrated in <FIG> and described in connection therewith. In some embodiments, the computing device <NUM> may be located remotely from the RFID scanner <NUM> and/or the PDT <NUM>, although in other embodiments, the RFID scanner <NUM> and/or the PDT <NUM> may comprise the computing device <NUM> in whole or in part. The computing device <NUM> may, in some embodiments, comprise several servers or computing devices performing interconnected and/or distributed functions. Despite the many arrangements contemplated herein, the computing device <NUM> is shown and described herein as a single computing device to avoid unnecessarily overcomplicating the invention. In some embodiments, one or more components of the computing device <NUM> may be wholly or partially housed within one or more of the RFID scanner <NUM> or the PDT <NUM>.

The network <NUM> may include one or more wired and/or wireless communication networks including, for example, a wired or wireless local area network (LAN), personal area network (PAN), metropolitan area network (MAN), wide area network (WAN), or the like, as well as any hardware, software and/or firmware for implementing the one or more networks (e.g., network routers, switches, hubs, etc.). For example, the network <NUM> may include a cellular telephone, mobile broadband, long term evolution (LTE), GSM/EDGE, UMTS/HSPA, IEEE <NUM>, IEEE <NUM>, IEEE <NUM>, Wi-Fi, dial-up, and/or WiMAX network. Furthermore, the network <NUM> may include a public network, such as the Internet, a private network, such as an intranet, or combinations thereof, and may utilize a variety of networking protocols now available or later developed including, but not limited to TCP/IP based networking protocols.

As illustrated in <FIG>, the computing device <NUM> may include a processor <NUM>, a memory <NUM>, input/output circuitry <NUM>, and communications circuitry <NUM>. Moreover, the computing device <NUM> may include RFID circuitry <NUM> and/or positional circuitry <NUM>. The computing device <NUM> may be configured to execute the operations described below in connection with <FIG>. Although components <NUM>-<NUM> are described in some cases using functional language, it should be understood that the particular implementations necessarily include the use of particular hardware. It should also be understood that certain of these components <NUM>-<NUM> may include similar or common hardware. For example, two sets of circuitry may both leverage use of the same processor <NUM>, memory <NUM>, communications circuitry <NUM>, or the like to perform their associated functions, such that duplicate hardware is not required for each set of circuitry. The use of the term "circuitry" as used herein includes particular hardware configured to perform the functions associated with respective circuitry described herein. As described in the example above, in some embodiments, various elements or components of the circuitry of the computing device <NUM> may be housed within one or more of the RFID scanner <NUM> and the PDT <NUM>. It will be understood in this regard that some of the components described in connection with the computing device <NUM> may be housed within one of these devices, while other components are housed within another of these devices, or by yet another device not expressly illustrated in <FIG>.

Of course, while the term "circuitry" should be understood broadly to include hardware, in some embodiments, the term "circuitry" may also include software for configuring the hardware. For example, although "circuitry" may include processing circuitry, storage media, network interfaces, input/output devices, and the like, other elements of the computing device <NUM> may provide or supplement the functionality of particular circuitry.

In some embodiments, the processor <NUM> (and/or co-processor or any other processing circuitry assisting or otherwise associated with the processor) may be in communication with the memory <NUM> via a bus for passing information among components of the computing device <NUM>. The memory <NUM> may be non-transitory and may include, for example, one or more volatile and/or non-volatile memories. In other words, for example, the memory may be an electronic storage device (e.g., a non-transitory computer readable storage medium). The memory <NUM> may be configured to store information, data, content, applications, instructions, or the like, for enabling the computing device <NUM> to carry out various functions in accordance with example embodiments of the present invention.

The processor <NUM> may be embodied in a number of different ways and may, for example, include one or more processing devices configured to perform independently. Additionally or alternatively, the processor may include one or more processors configured in tandem via a bus to enable independent execution of instructions, pipelining, and/or multithreading. The use of the term "processing circuitry" may be understood to include a single core processor, a multi-core processor, multiple processors internal to the computing device, and/or remote or "cloud" processors.

In an example embodiment, the processor <NUM> may be configured to execute instructions stored in the memory <NUM> or otherwise accessible to the processor <NUM>. Alternatively or additionally, the processor <NUM> may be configured to execute hard-coded functionality. As such, whether configured by hardware or by a combination of hardware with software, the processor <NUM> may represent an entity (e.g., physically embodied in circuitry) capable of performing operations according to an embodiment of the present invention while configured accordingly. Alternatively, as another example, when the processor <NUM> is embodied as an executor of software instructions, the instructions may specifically configure the processor <NUM> to perform the algorithms and/or operations described herein when the instructions are executed.

The computing device <NUM> further includes input/output circuitry <NUM> that may, in turn, be in communication with processor <NUM> to provide output to a user and to receive input from a user, user device, or another source. In this regard, the input/output circuitry <NUM> may comprise a display that may be manipulated by a mobile application. In some embodiments, the input/output circuitry <NUM> may also include additional functionality including a keyboard, a mouse, a joystick, a touch screen, touch areas, soft keys, a microphone, a speaker, or other input/output mechanisms. The processor <NUM> and/or user interface circuitry comprising the processor <NUM> may be configured to control one or more functions of a display through computer program instructions (e.g., software and/or firmware) stored on a memory accessible to the processor (e.g., memory <NUM>, and/or the like).

The communications circuitry <NUM> may be any means such as a device or circuitry embodied in either hardware or a combination of hardware and software that is configured to receive and/or transmit data from/to a network and/or any other device, circuitry, or module in communication with the computing device <NUM>. In this regard, the communications circuitry <NUM> may include, for example, a network interface for enabling communications with a wired or wireless communication network. For example, the communications circuitry <NUM> may include one or more network interface cards, antennae, buses, switches, routers, modems, and supporting hardware and/or software, or any other device suitable for enabling communications via a network. Additionally or alternatively, the communication interface may include the circuitry for interacting with the antenna(s) to cause transmission of signals via the antenna(s) or to handle receipt of signals received via the antenna(s). These signals may be transmitted by the computing device <NUM> using any of a number of wireless personal area network (PAN) technologies, such as Bluetooth® v1. <NUM> through v3. <NUM>, Bluetooth Low Energy (BLE), infrared wireless (e.g., IrDA), ultra-wideband (UWB), induction wireless transmission, or the like. In addition, it should be understood that these signals may be transmitted using Wi-Fi, Near Field Communications (NFC), Worldwide Interoperability for Microwave Access (WiMAX) or other proximity-based communications protocols.

RFID circuitry <NUM> includes hardware components designed to receive a stream of radio-frequency identification (RFID) tags, wherein each RFID tag is associated with a respective article. The RFID circuitry <NUM> may be housed in whole or in part within the RFID scanner <NUM>, the PDT <NUM>, and or the computing device <NUM>. The RFID circuitry <NUM> may utilize processing circuitry, such as the processor <NUM>, to perform its corresponding operations, and may utilize memory <NUM> to store collected information.

Positional circuitry <NUM> includes hardware components designed to analyze positional data generate by the first sensor(s) and the second sensor(s). Positional circuitry <NUM> may utilize processing circuitry, such as the processor <NUM>, to perform its corresponding operations, and may utilize memory <NUM> to store collected information. The positional circuitry <NUM> may be housed in whole or in part within the RFID scanner <NUM>, the PDT <NUM>, and or the computing device <NUM>. In some instances, the positional circuitry <NUM> may be configured to, based upon first rotational data and second rotational data from the first sensor and second sensor, respectively, determine a net rotation of the first sensor relative to the second sensor and determine a pick operation in an instance in which the net rotation satisfies a rotation threshold. Similarly, the positional circuitry <NUM> may be configured to, based upon first acceleration data and second acceleration data from the first sensor and second sensor, respectively, determine a net acceleration of the first sensor relative to the second sensor and determine a pick operation in an instance in which the net acceleration satisfies an acceleration threshold.

It should also be appreciated that, in some embodiments, the RFID circuitry <NUM> and/or the positional circuitry <NUM> may include a separate processor, specially configured field programmable gate array (FPGA), or application specific interface circuit (ASIC) to perform its corresponding functions.

In addition, computer program instructions and/or other type of code may be loaded onto a computer, processor or other programmable circuitry to produce a machine, such that the computer, processor other programmable circuitry that execute the code on the machine create the means for implementing the various functions, including those described in connection with the components of computing device <NUM>.

As described above and as will be appreciated based on this invention, embodiments of the present invention may be configured as scanning systems, methods, and the like. Accordingly, embodiments may comprise various means including entirely of hardware or any combination of software with hardware. Furthermore, embodiments may take the form of a computer program product comprising instructions stored on at least one non-transitory computer-readable storage medium (e.g., computer software stored on a hardware device). Any suitable computer-readable storage medium may be utilized including non-transitory hard disks, CD-ROMs, flash memory, optical storage devices, or magnetic storage devices.

<FIG> illustrates a flowchart containing a series of operations for improved tag identification. The operations illustrated in <FIG> may, for example, be performed by, with the assistance of, and/or under the control of an apparatus (e.g., computing device <NUM>), as described above. In this regard, performance of the operations may invoke one or more of processor <NUM>, memory <NUM>, input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, and/or positional circuitry <NUM>.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, or the like, for receiving a stream of radio-frequency identification (RFID) tags. As described above, the warehouse or other material handling environment may include a plurality of articles each of which includes an RFID tag attached thereto. Due to the close proximity of these articles, the RFID scanner <NUM> may receive a stream of RFID tags each of which is associated with a respective article at operation <NUM>. In some embodiments, as described hereafter with reference to <FIG>, each of the RFID tags in the stream may be timestamped (e.g., include tag time data) indicative of the time at which the RFID tag received an interrogation signal from the RFID scanner <NUM>. In some embodiments, the RFID tags (e.g., RFID tag data) and/or tag time data may be stored by the RFID scanner <NUM>. In other embodiments, the RFID scanner may transmit the RFID tag data and/or tag time data to the computing device <NUM> and/or PDT <NUM> for further processing as described hereafter.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving first positional data from a first sensor. As described above, in some embodiments, the first sensor may be housed by the RFID scanner <NUM> and, in operation, may be positioned on a user's hand. In this way, the first sensor of the RFID scanner <NUM> may be configured to generate first positional data indicative of the position, location, velocity, tilt, etc. of the RFID scanner <NUM>. By way of example and as described hereafter with reference to <FIG>, the first sensor may comprise a gyroscope or other rotational sensor such that the first positional data comprises first rotational data associated with the RFID scanner <NUM> (e.g., and user's hand). By way of an additional example and as described hereafter with reference to <FIG>, the first sensor may comprise an accelerometer or other equivalent sensor such that the first positional data comprises first acceleration data associated with the RFID scanner <NUM> (e.g., and user's hand).

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving second positional data from a second sensor located separate from the first sensor. As described above, in some embodiments, the second sensor may be housed by the PDT <NUM> and, in operation, may be positioned on a user's torso. In any event, the second sensor may be positioned separate from the first sensor so as to provide an independent source of positional data (e.g., associated with the user but distinct from the RFID scanner <NUM>). In this way, the second sensor of the PDT <NUM> may be configured to generate second positional data indicative of the position, location, velocity, tilt, etc. of the user's torso. By way of example and as described hereafter with reference to <FIG>, the second sensor may comprise a gyroscope or other rotational sensor such that the second positional data comprises second rotational data associated with the PDT <NUM> (e.g., and user's torso). By way of an additional example and as described hereafter with reference to <FIG>, the second sensor may comprise an accelerometer or other equivalent sensor such that the second positional data comprises second acceleration data associated with the PDT <NUM> (e.g., and user's torso).

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, positional circuitry <NUM>, or the like, for determining an intended RFID tag from amongst the stream of RFID tags based upon the first positional data and the second positional data. As described further hereafter with reference to <FIG>, the scanning system and/or computing device <NUM> may analyze the first positional data from the first sensor and the second positional data from the second sensor to determine an intended RFID tag from amongst the stream of RFID tags received at operation <NUM>. By way of example, a user may be equipped with the RFID scanner <NUM> located on the user's hand. The user may approach a plurality of articles each associated with respective RFID tags, and the RFID scanner <NUM> may receive a stream of RFID tags (e.g., RFID tag data) from the plurality of articles. As described with reference to operation <NUM>, the scanning system <NUM> may receive first positional data from the first sensor indicative of the position of the user's hand. As described with reference to operation <NUM>, the scanning system <NUM> may receive second positional data from the second sensor indicative of the position of the user's torso.

Although the first positional data may indicate the position of the RFID scanner <NUM> and user's hand, the first positional data alone may not be indicative of the RFID scanner <NUM> and user's hand performing a picking operation. Said differently, a user's hand may be located proximate many articles at times that coincide with RFID tag data received by the scanning system <NUM> and/or computing device <NUM>. As such, the scanning system <NUM> described herein may rely upon the first positional data from the first sensor in conjunction with the second positional data of the second sensor (e.g., positioned at the user's torso) in order to determine a pick operation as described hereafter with reference to <FIG>. In some embodiments, the scanning system <NUM> may use the second positional data indicative of the position of the user's torso to determine the net positional data (e.g., difference between the first positional data and the second positional data) in order to identify a pick operation. For example, first acceleration data of the RFID scanner <NUM> and user's arm alone may indicate that the user is moving his or her arm to pick an article. However, second acceleration of the PDT <NUM> and second sensor may indicate that the user is also moving (e.g., walking or running). In such an embodiment, the net acceleration may indicate that a pick operation is not occurring.

In some embodiments, as shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, or the like, for analyzing the intended RFID tag. For example, the RFID circuitry <NUM> may identify or receive the intended RFID tag from the stream of RFID tags and analyze the intended RFID tag to determine one or more characteristics of the article associated with the intended RFID tag. In some embodiments, the intended RFID tag, when received by the RFID scanner <NUM>, may include various characteristics of the associated article (e.g., product type, current location, destination location, etc.). In other embodiments, the intended RFID tag may include identifying information (e.g., product code, item number, etc.) such that the scanning system <NUM> (e.g., computing device <NUM>) may query an article database (not shown) storing one or more characteristics the article associated with the intended RFID tag.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, or the like, for generating a user notification based upon the intended RFID tag. For example, the scanning system <NUM> may determine the intended RFID tag and analyze the intended RFID tag at operations <NUM> and <NUM>, respectively, to identify one or more characteristics of the intended RFID tag. The communications circuitry <NUM> and/or input/output circuitry <NUM> of the computing device <NUM> may generate a user notification displaying or more characteristics of the intended RFID tag. By way of example, the intended RFID tag may include destination characteristics indicative of a next or final position of the article associated with the intended RFID tag. As such, the user may grab the article, the scanning system may perform the operations described above (e.g., operations <NUM>-<NUM>), and may present a visual or audio notification to the user indicative of the destination of the article associated with the intended RFID tag (e.g., move article to shuttle A). Although described herein with reference to a destination location, the present invention contemplates that any characteristic of the article associated with the intended RFID tag may be presented to the user based upon the intended application of the scanning system <NUM>.

<FIG> illustrates a flowchart containing a series of operations for net rotation determinations. The operations illustrated in <FIG> may, for example, be performed by, with the assistance of, and/or under the control of an apparatus (e.g., computing device <NUM>), as described above. In this regard, performance of the operations may invoke one or more of processor <NUM>, memory <NUM>, input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, and/or positional circuitry <NUM>.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving first positional data from the first sensor including first rotational data. As described above, in some embodiments, the first sensor may be housed by the RFID scanner <NUM> and, in operation, may be positioned on a user's hand. In this way, the first sensor of the RFID scanner <NUM> may be configured to generate first positional data indicative of the rotational position, tilt, or the like of the RFID scanner <NUM>. In particular, the first sensor may comprise a gyroscope or other rotational sensor such that the first positional data comprises first rotational data associated with the RFID scanner <NUM> (e.g., and user's hand). By way of example, a user may attempt to hold, grab, etc. an article by grasping the sides (e.g., vertical sides) of the article. In such an example, the first rotational data from the first sensor (e.g., housed with the RFID scanner <NUM>) may indicate that the force of gravity exists in the X-Z plane indicating that the user's hand is located on a vertical surface of the article. Furthermore, in an instance in which the total gravitational force detected by the first sensor (e.g., gyroscope, accelerometer, or the like) exceeds <NUM>, the first rotational sensor data may be indicative of the user lifting the article.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving second positional data from a second sensor including second rotational data. As described above, in some embodiments, the second sensor may be housed by the PDT <NUM> and, in operation, may be positioned on a user's torso. In any event, the second sensor may be positioned separate from the first sensor so as to provide an independent source of positional data (e.g., associated with the user but distinct from the RFID scanner <NUM>). In this way, the second sensor of the PDT <NUM> may be configured to generate second positional data indicative of the rotational position, tilt, or the like of the user's torso. The second sensor may comprise a gyroscope or other rotational sensor such that the second positional data comprises second rotational data associated with the PDT <NUM> (e.g., and user's torso).

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for subtracting the second rotational data from the first rotational data to determine a net rotation of the first sensor relative to the second sensor. As described above, in some embodiment, reliance upon the first rotational data of the first sensor housed by the RFID scanner <NUM> may be insufficient to identify instances in which a user is performing a pick operation. By way of example, the first rotational data may indicate that the user hand (e.g., RFID scanner <NUM>) is located at <NUM> degrees such that the user may be resting his or her hand on a vertical surface of an article. Due to the varying slopes, levels, etc. in a material handling environment, however, the user's hand (e.g., RFID scanner <NUM>) may instead be located at <NUM> degrees with respect to a sloped surface (e.g., ramp, conveyor, etc.) but not <NUM> degrees with respect to the user's body (e.g., torso). As such, the scanning system <NUM> may subtract the second rotational data (e.g., from the PDT <NUM>) from the first rotational data (e.g., RFID scanner <NUM>) to determine the net rotation of the first sensor (e.g., RFID scanner <NUM>) relative to the second sensor (e.g., PDT <NUM>). Said differently, the net rotation may more accurately indicate instances in which the user grips the vertical side of an article.

As shown in operations <NUM> and <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for determining a pick operation in an instance in which the net rotation satisfies a rotation threshold. The scanning system <NUM> and computing device <NUM> may employ one or more rotation thresholds indicative of a user performing a pick operation (e.g., grasping an article). By way of example, the rotation threshold may include a net rotation range of between approximately <NUM> degrees and <NUM> degree with respect to the PDT <NUM> (e.g., the second sensor). In such an example, a net rotation that falls within the range would satisfy the rotation threshold and indicate that the user is performing a pick operation (e.g., positioning his or her hands to grasp a vertical surface of the article). Although described herein with reference to a rotational range, the present invention contemplates that any rotation threshold based upon gravitational force, angular velocity, or the like may be used based upon the intended application of the scanning system <NUM>.

In response to determining a pick operation at operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, positional circuitry <NUM>, or the like, for determining the intended RFID tag that corresponds with the pick operation at operation <NUM>. As described above, the stream of RFID tags may be timestamped (e.g., include tag time data) indicative of the time at which the RFID tag received an interrogation signal from the RFID scanner <NUM>. In some embodiments, the RFID tags (e.g., RFID tag data) and/or tag time data may be stored by the RFID scanner <NUM>. In other embodiments, the RFID scanner may transmit the RFID tag data and/or tag time data to the computing device <NUM> and/or PDT <NUM> for further processing as described hereafter. In order to determine the intended RFID tag, the scanning system <NUM> and/or computing device <NUM> may select the RFID tag from amongst the stream of RFID tags having a timestamp that coincides with the time of the determined pick operation. Said differently, the scanning system <NUM> may determine that the user is grasping the vertical side of an article (e.g. performing a pick operation) and select the RFID tag having tag time data that corresponds with this action. As described with reference to <FIG>, the scanning system may further analyze the intended RFID tag and/or generate a notification to the user based upon the intended RFID tag.

<FIG> illustrates a flowchart containing a series of operations for net acceleration determinations. The operations illustrated in <FIG> may, for example, be performed by, with the assistance of, and/or under the control of an apparatus (e.g., computing device <NUM>), as described above. In this regard, performance of the operations may invoke one or more of processor <NUM>, memory <NUM>, input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, and/or positional circuitry <NUM>.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving first positional data from the first sensor including first acceleration data. As described above, in some embodiments, the first sensor may be housed by the RFID scanner <NUM> and, in operation, may be positioned on a user's hand. In this way, the first sensor of the RFID scanner <NUM> may be configured to generate first positional data indicative of the acceleration, velocity, or the like of the RFID scanner <NUM>. In particular, the first sensor may comprise an accelerometer or other equivalent sensor such that the first positional data comprises first acceleration data associated with the RFID scanner <NUM> (e.g., and user's hand). By way of example, a user may attempt to hold, grab, etc. an article by moving his or her hand from the user's torso to a position to grasp the sides (e.g., vertical sides) of the article. In such an example, the first acceleration data from the first sensor (e.g., housed with the RFID scanner <NUM>) may indicate that the user's hand (e.g., RFID scanner <NUM>) is accelerating away from the user's body.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving second positional data from a second sensor including second acceleration data. As described above, in some embodiments, the second sensor may be housed by the PDT <NUM> and, in operation, may be positioned on a user's torso. In any event, the second sensor may be positioned separate from the first sensor so as to provide an independent source of positional data (e.g., associated with the user but distinct from the RFID scanner <NUM>). In this way, the second sensor of the PDT <NUM> may be configured to generate second acceleration data indicative of the acceleration, velocity, or the like of the user's torso. The second sensor may comprise an accelerometer or other equivalent sensor such that the second positional data comprises second acceleration data associated with the PDT <NUM> (e.g., and user's torso).

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for subtracting the second acceleration data from the first acceleration data to determine a net acceleration of the first sensor relative to the second sensor. As described above, in some embodiment, reliance upon the first acceleration data of the first sensor housed by the RFID scanner <NUM> may be insufficient to identify instance in which a user is performing a pick operation. By way of example, the first acceleration data may indicate that the user hand (e.g., RFID scanner <NUM>) is accelerating from the user's torso to grasp a vertical surface of an article. Due to the movement of the user about the material handling environment, however, the user's hand (e.g., RFID scanner <NUM>) may instead be accelerating from the user's torso while the user's torso is also accelerating (e.g., the user is walking, running, or otherwise moving). As such, the scanning system <NUM> may subtract the second acceleration data (e.g., from the PDT <NUM>) from the first acceleration data (e.g., RFID scanner <NUM>) to determine the net acceleration of the first sensor (e.g., RFID scanner <NUM>) relative to the second sensor (e.g., PDT <NUM>). Said differently, the net acceleration may more accurately indicate instances in which the user hand is moving from the user's torso so as to grip the vertical side of an article.

The present invention contemplates that the subtract of acceleration data described with reference to operation <NUM> may refer to subtraction of a portion of the second acceleration data from the first acceleration data. In particular, second acceleration data from the second sensor may include low frequency component data that, when removed or subtracted from the first acceleration data, improves the quality of the first acceleration data. Said differently, low frequency component data of the second sensor may, in some embodiments, represent movement of the user's entire body (e.g., when the second sensor is positioned on the operator's torso) such that this low frequency component data likely represents movement of both the first sensor and the second sensor. As such, by removing this low frequency component data associated with the movement of the first sensor and the second sensor, the first acceleration data may more accurately represent the acceleration of the first sensor.

As shown in operation <NUM> and <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for determining a pick operation in an instance in which the net acceleration satisfies an acceleration threshold. The scanning system <NUM> and computing device <NUM> may employ one or more acceleration thresholds indicative of a user performing a pick operation (e.g., grasping an article). By way of example, the acceleration threshold may include a net acceleration range of between approximately <NUM>/s<NUM> and <NUM>/s<NUM> with respect to the PDT <NUM> (e.g., the second sensor). In such an example, a net acceleration that falls within the range would satisfy the acceleration threshold and indicate that the user is performing a pick operation (e.g., positioning his or her hands to grasp a vertical surface of the article). Although described herein with reference to an acceleration range, the present invention contemplates that any acceleration threshold based upon gravitational force, angular velocity, or the like may be used based upon the intended application of the scanning system <NUM>.

As described above, in response to determining a pick operation at operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, positional circuitry <NUM>, or the like, for determining the intended RFID tag that corresponds with the pick operation at operation <NUM>. The stream of RFID tags may be timestamped (e.g., include tag time data) indicative of the time at which the RFID tag received an interrogation signal from the RFID scanner <NUM>. In some embodiments, the RFID tags (e.g., RFID tag data) and/or tag time data may be stored by the RFID scanner <NUM>. In other embodiments, the RFID scanner may transmit the RFID tag data and/or tag time data to the computing device <NUM> and/or PDT <NUM> for further processing as described hereafter. In order to determine the intended RFID tag, the scanning system <NUM> and/or computing device <NUM> may select the RFID tag from amongst the stream of RFID tags having a timestamp that coincides with the time of the determined pick operation. Said differently, the scanning system <NUM> may determine that the user is grasping the vertical side of an article (e.g. performing a pick operation) and select the RFID tag having tag time data that corresponds with this action. As described with reference to <FIG>, the scanning system may further analyze the intended RFID tag and/or generate a notification to the user based upon the intended RFID tag.

<FIG> illustrates a flowchart containing a series of operations for intended time window determinations. The operations illustrated in <FIG> may, for example, be performed by, with the assistance of, and/or under the control of an apparatus (e.g., computing device <NUM>), as described above. In this regard, performance of the operations may invoke one or more of processor <NUM>, memory <NUM>, input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, and/or positional circuitry <NUM>.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving tag time data for each RFID tag in the stream. As described above, in some embodiments, each RFID tag from the stream of RFID tags may be timestamped (e.g., include tag time data) indicative of the time at which the RFID tag received an interrogation signal from the RFID scanner <NUM>. In some embodiments, the RFID tags (e.g., RFID tag data) and/or tag time data may be stored by the RFID scanner <NUM>. In other embodiments, the RFID scanner may transmit the RFID tag data and/or tag time data to the computing device <NUM> and/or PDT <NUM> for further processing as described hereafter.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving first positional data from a first sensor including first time data. As described above, the first sensor may be housed by the RFID scanner <NUM> and, in operation, may be positioned on a user's hand. In this way, the first sensor of the RFID scanner <NUM> may be configured to generate first positional data indicative of the rotational position, tilt, or the like of the RFID scanner <NUM>. In particular, the first sensor may comprise a gyroscope and/or accelerometer such that the first positional data comprises first rotational data and/or first acceleration data associated with the RFID scanner <NUM> (e.g., and user's hand). In some embodiments, each first positional data entry generated by the first sensor of the RFID scanner <NUM> and received by the computing device <NUM> may be timestamped (e.g., include first time data) indicative of the time at which the first positional data was generated.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for receiving second positional data from a second sensor including second time data. Similar to the first positional data, in some embodiments, the second sensor may be housed by the PDT <NUM> and, in operation, may be positioned on a user's torso. In any event, the second sensor may be positioned separate from the first sensor so as to provide an independent source of positional data (e.g., associated with the user but distinct from the RFID scanner <NUM>). In this way, the second sensor of the PDT <NUM> may be configured to generate second positional data indicative of the rotational position, tilt, or the like of the user's torso. The second sensor may comprise a gyroscope and/or accelerometer such that the second positional data comprises second rotational data and/or second acceleration data associated with the PDT <NUM> (e.g., and user's torso). In some embodiments, each second positional data entry generated by the second sensor of the PDT <NUM> and received by the computing device <NUM> may be timestamped (e.g., include second time data) indicative of the time at which the second positional data was generated.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, positional circuitry <NUM>, or the like, for generating an intended time window based upon the tag time data. As described above, each RFID tag may be associated with tag time data. Given that the scanning system <NUM> is concerned with improving tag identification (e.g., reducing incorrect RFID tag selection), the computing device <NUM> may, at operation <NUM>, generate an intended time window by removing positional data (e.g., first positional data and second positional data) that is outside (e.g., does not correspond with) the tag time data. Said differently, the scanning system <NUM> may remove positional data readings that are not associated with (e.g., coincide with tag time data) timestamped RFID tags (e.g., user movement unrelated to pick operations).

In response to generating an intended time window at operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, positional circuitry <NUM>, or the like, for analyzing first positional data and second positional data having first time data and second time data, respectively, within the intended time window. As described above at operation <NUM>, the scanning system <NUM> may remove positional data received from the first sensor and the second sensor outside of the intended time window to reduce false positives (e.g., positional data indicated of a pick operation but not associated with tag time data). The scanning system <NUM> and/or computing device <NUM> may utilize the operations described above with refence to <FIG> and <FIG> to determine intended RFID tags within the intended time window.

<FIG> illustrates a flowchart containing a series of operations for signal strength determinations. The operations illustrated in <FIG> may, for example, be performed by, with the assistance of, and/or under the control of an apparatus (e.g., computing device <NUM>), as described above. In this regard, performance of the operations may invoke one or more of processor <NUM>, memory <NUM>, input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, and/or positional circuitry <NUM>.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, or the like, for receiving a stream of radio-frequency identification (RFID) tags. As described above with reference to <FIG>, the warehouse or other material handling environment may include a plurality of articles each of which includes an RFID tag attached thereto. Due to the close proximity of these articles, the RFID scanner <NUM> may receive a stream of RFID tags each of which is associated with a respective article at operation <NUM>. In some embodiments, as described above with reference to <FIG>, each of the RFID tags in the stream may be timestamped (e.g., include tag time data) indicative of the time at which the RFID tag received an interrogation signal from the RFID scanner <NUM>. In some embodiments as described hereafter with reference to operation <NUM>, the RFID tags may include an associated signal strength, received signal strength indicator (RSSI), or the like.

Although described hereafter with reference to signal strength determinations alone, the present disclose contemplates that signal strength data associated with the stream of RFID tags may be used in conjunction with the positional data of the first sensor (e.g., first rotational data and/or first acceleration data), the positional data of the second sensor (e.g., second rotational data and/or second acceleration data), and tag time data. Said differently, the operations described hereafter with reference to <FIG> may be used in conjunction with one or more of the operations described in <FIG> to further improve intended tag determinations.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, or the like, for receiving signal strength data for each RFID tag in the stream. As described above, an operator equipped with the RFID scanner may approach a plurality of articles in close proximity each of which include a respective RFID tag. As such, the RFID scanner of the operator may receive RFID tag data from the plurality of articles each of which is associated with a received signal strength indicator (RSSI). Although described hereafter with reference to a RSSI, the present invention contemplates that any indication of the signal strength associated with each RFID tag may also be used. In some embodiments, the RFID signal strength data may be stored by the RFID scanner <NUM>. In other embodiments, the RFID scanner may transmit the signal strength data to the computing device <NUM> and/or PDT <NUM> for further processing as described hereafter. Furthermore, in some embodiments, the signal strength data may be associated with a value measured in decibels (dB), for example between <NUM> dB and -<NUM> dB, such that the closer that the value of the signal strength data is to <NUM> dB, the stronger the signal strength.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, or the like, for analyzing the signal strength data to determine if the signal strength of each RFID tag satisfies a signal threshold. By way of example, the scanning system <NUM> and/or computing device <NUM> may receive a stream of RFID tags that includes RFID tag data associated with three (<NUM>) distinct RFID tags. Each of the three (<NUM>) RFID tags from the stream may include an associated signal strength (e.g., signal strength data). For example, a first RFID tag may include a signal strength of -<NUM> dB, a second RFID tag may include a signal strength of -<NUM> dB, and a third RFID tag may include a signal strength of -<NUM> dB. In such an example, the signal strength of the first RFID tag is the largest from amongst the plurality of RFID tag data. In some embodiments, the scanning system <NUM> and/or computing device <NUM> may determine that the RFID tag with the largest signal strength data is the intended RFID tag. In other embodiments in which a large number of RFID tags are received, for example, the system may employ one or more signal strength thresholds to determine the intended RFID tag.

With continued reference to operation <NUM>, a signal strength threshold may be defined as -<NUM> dB such that any signal strength data that is less than the -<NUM> dB threshold (e.g., is farther from zero than -<NUM> dB) fails to satisfy signal strength threshold. In an instance in which the signal strength exceeds -<NUM> dB (e.g., is closer to zero than -<NUM> dB) the scanning system <NUM> and/or the computing device may determine that the signal strength satisfies the signal strength threshold at operation <NUM>. In some embodiments, the signal strength threshold may include a range of values within which the received signal strength must fall in order to satisfy the signal strength threshold. By way of example, an operator may be located proximate a large collection of articles each of which include an associated RFID tag. Such a large collection may result in the operator physically contacting some articles (e.g., articles not intended to be picked) while picking the intended article. Said differently, the scanning system <NUM> and/or computing device <NUM> may receive signal strength data associated with an RFID tag that is stronger than the signal strength of the intended RFID tag. As such, a signal threshold range (e.g., between -<NUM> dB and -<NUM> dB) may also be used to determine the intended RFID tag.

As shown in operation <NUM>, the apparatus (e.g., scanning system <NUM> and/or computing device <NUM>) includes means, such as input/output circuitry <NUM>, communications circuitry <NUM>, RFID circuitry <NUM>, or the like, for determining the intended RFID tag based upon the signal strength. In response to operations <NUM> and <NUM>, the scanning system <NUM> and/or computing device <NUM> may, in some embodiments, determine that the RFID tag from amongst the stream that satisfies the signal strength threshold is the intended RFID tag. In other embodiments, the scanning system <NUM> and/or computing device <NUM> may determine that the RFID tag from amongst the stream having the largest signal strength threshold is the intended RFID tag. In other embodiments, however, the scanning system <NUM> and/or computing device <NUM> may receive a plurality of RFID tag data each of which satisfy the signal strength threshold and/or are substantially the same in value. In such an example, the scanning system <NUM> and/or computing device <NUM> may be configured to utilize the methods of <FIG> in conjunction with the signal strength data to determine the intended RFID tag.

As described above, various technical challenges are surmounted via technical solutions contemplated herein. For instance, example implementations of embodiments of the present invention may utilize a first sensor attached to the RFID scanner and a second sensor separate from the RFID scanner (e.g., attached to a PDT) in order to accurately identify an intended RFID tag. Embodiments of the present invention may employ accelerometers, gyroscopes, and related positional sensors in order to determine relative acceleration and tilt between a user's hand (e.g., supporting the RFID scanner) and the user's torso (e.g., supporting the PDT). The net rotation and net acceleration may be used to determine a pick operation (e.g., when a user grabs an item) and determine an intended RFID tag that corresponds with the pick operation. In doing so, such example implementations reliably identify intended RFID tags resulting in efficient operator workflows with reduced down time.

<FIG> thus illustrate flowcharts describing the operation of apparatuses, methods, and computer program products according to example embodiments contemplated herein. It will be understood that each flowchart block, and combinations of flowchart blocks, may be implemented by various means, such as hardware, firmware, processor, circuitry, and/or other devices associated with execution of software including one or more computer program instructions. For example, one or more of the operations described above may be implemented by an apparatus executing computer program instructions. In this regard, the computer program instructions may be stored by a memory <NUM> of the computing device <NUM> and executed by a processor <NUM> of the computing device <NUM>. As will be appreciated, any such computer program instructions may be loaded onto a computer or other programmable apparatus (e.g., hardware) to produce a machine, such that the resulting computer or other programmable apparatus implements the functions specified in the flowchart blocks. These computer program instructions may also be stored in a computer-readable memory that may direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture, the execution of which implements the functions specified in the flowchart blocks. The computer program instructions may also be loaded onto a computer or other programmable apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions executed on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart blocks.

Claim 1:
A method for tag identification, the method comprising:
receiving a stream of radio-frequency identification, RFID, tags, wherein each RFID tag is associated with a respective article;
receiving first positional data from a first sensor associated with a user;
receiving second positional data from a second sensor associated with the user and located separate from the first sensor; and
determining an intended RFID tag from amongst the stream of RFID tags based upon the first positional data and the second positional data.