Please select the most similar patent number from A, B, C and D. Which number is?
A debris flow monitoring, evacuating and alarming system, comprising a plurality of sensor modules, a plurality of signal receivers, and a monitoring host platform of a disaster-prevention center. The sensor modules are paved in a monitored area into an esther matrix. Status change information of the monitored area detected by sensors, real-time status information of the sensors and low-voltage alarm information are wirelessly transmitted to the signal receivers by means of an internet communication protocol LPWA. The signal receivers forward the status change information, the real-time status information of the sensors and the low-voltage alarm information to the monitoring host platform of the disaster-prevention center through a wired or wireless network. The monitoring host platform of the disaster-prevention center determines, according to an alarming reference value and an alarming rule and by using an esther matrix rule and an esther AI judgment formula, whether sensors in an alarming or alert state are neighbored and whether to perform a debris flow evacuating alarm.
A: A battery monitoring apparatus (10) and system (100). The battery monitoring apparatus (10) comprises a plurality of sensors, a processing unit (41) and a PLC interface (45). The plurality of sensors comprise one or more ultrasonic sensors (11), and the plurality of sensors are used for sensing a plurality of parameters of a cell (30). The processing unit (41) is electrically connected to the plurality of sensors, and is used for receiving the plurality of parameters and determining the state of the cell (30) according to the plurality of parameters. The PLC interface (45) is electrically connected to the processing unit (41) and is electrically connected to a power line of the cell (30), and is used for reporting state information to a controller (20) by means of the power line. By means of the apparatus, on the basis of a signal transmission mode of a PLC protocol, high-speed transmission and real-time transmission of a signal can be realized, thereby reducing additional transmission lines and being convenient to implement; and a plurality of sensors including an ultrasonic sensor (11) can be integrated into a battery monitoring system to realize real-time monitoring of the state of a cell (30).
B: A parking space detection system and method based on a LoRa wireless communication technology. The method comprises: use a geomagnetic sensor circuit to detect geomagnetic data for representing the parking space state; a microcontroller circuit controls on and off of the geomagnetic sensor circuit, and stores the data detected by the geomagnetic sensor circuit; a wireless radio frequency circuit sends the data stored by the microcontroller circuit to a wireless data radio by means of the LoRa wireless communication technology; the wireless data radio forwards the received information of the parking space state to an upper computer; the upper computer determines the parking space state, and forwards same to a cell phone of a vehicle owner. The detection system and method relate to monitoring magnetic fields of each parking space, analyzing the changes in the magnetic fields, determining whether there is a vehicle, and forwarding the result to the vehicle owner, which can make the vehicle owner learn about the information of the parking state of a parking lot more intuitively.
C: The present invention relates to the field of wireless information technology processing. Disclosed is an indoor fire detection and alarm system based on a wireless signal. Steps for realizing the system mainly comprise: a wireless receiving end receiving a wireless electromagnetic signal from a wireless transmitting end, evaluating CSI (channel state information), and adopting a data filtering technique (a Butterworth filter) to carry out denoising on data; using an abnormality detection algorithm (sequence abnormality) to recognize an abnormality of a change in channel state information; and adopting a random forest algorithm, selecting five feature extraction methods (such as standard deviation and an interquartile range), storing indoor fire signal information, and if a signal feature in an abnormal mode matches a stored signal feature, determining that an indoor fire has broken out, and then giving a fire alarm signal. The present invention has the following beneficial effects: an existing wireless network and a device are mainly used, no additional detection or sensing device needs to be installed in a room, no additional laying price is needed, the fire can be monitored in real time, and the universality thereof is extremely high.
D: A matrix-type three-dimensional-layered landslide monitoring and early-warning system characterized in that: the system consists of stand-alone positioning sensors (1), and a relay station (2) and a monitoring center (3) in proximity to the stand-alone positioning sensors. The stand-alone positioning sensors are buried vertically in positions in a mountain requiring monitoring. The stand-alone positioning sensors are each provided with a radio module, a battery (1-7), and a positioning response device. A wireless signal transmitted by the stand-alone positioning sensors (1) is received and retransmitted by the relay station to the monitoring center (3) reception system. The advantages of the early-warning system are: the early-warning system has a long life, allows for automatic remote monitoring, has a simple structure, has accurate early-warning capabilities, and does not consume energy during periods of inactivity. The stand-alone positioning sensors remain hidden from sight and are not easily damaged. The early-warning system minimizes losses caused by natural disasters such as landslides, mudslides, and sand dune movements.
Answer: D