Abstract:
A method for providing uplink collision identification includes at a first satellite uplink, transmitting a first signal to a satellite; at the first satellite uplink, transmitting a first unique satellite uplink identification signal to the satellite; at a satellite downlink, receiving the first signal and the first unique satellite uplink identification signal; and at the satellite downlink, identifying the first satellite uplink in response to the first unique satellite uplink identification signal.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of U.S. provisional patent application 60/872,182 filed Dec. 1, 2006, the entire contents of which are incorporated herein by reference. 
     
    
     BACKGROUND 
       [0002]    Exemplary embodiments relate generally to satellite communications and, more particularly, to methods, systems, and computer program products for providing satellite uplink identification to avoid signal collision. 
         [0003]    Occasionally, either by accident or intention, more than one satellite uplink will transmit into the same transponder of a given satellite. This results in a mixing of the two transmissions, referred to in the art as double illumination. The satellite downlink receives the mixed signals, but cannot determine which satellite uplink is interfering with the intended signal. This may result in the proper transmission being terminated in an attempt to identify the source of the unwanted signal. In this scenario, the satellite downlink typically ceases distribution of signals to recipients until the unwanted signal can be terminated. Alternatively, recipients of the satellite downlink signal receive the unwanted signal. In either case, the recipients of the satellite downlink (e.g., viewers of programming) are not receiving the intended content. 
         [0004]    Thus, there is a need in the art to identify the transmission source of a signal transmitted on a satellite uplink such that, in the event that a signal is unwanted, the transmitter may be promptly notified. 
       BRIEF SUMMARY 
       [0005]    Exemplary embodiments relate to a method for identifying satellite uplink signals by transmitting a unique identification signal associated with the satellite uplink. The identification signal may be used by the satellite downlink to quickly identify the source of unwanted satellite signals. 
         [0006]    Additional exemplary embodiments include systems and computer program products for identifying satellite uplinking signals. 
         [0007]    Other systems, methods, and/or computer program products according to embodiments will be or become apparent to one with skill in the art upon review of the following drawings and detailed description. It is intended that all such additional systems, methods, and/or computer program products be included within this description, be within the scope of the exemplary embodiments, and be protected by the accompanying claims. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0008]    Referring now to the drawings wherein like elements are numbered alike in the several FIGURES: 
           [0009]      FIG. 1  is a high level block diagram of a satellite uplink and downlink; and 
           [0010]      FIG. 2  illustrates a code transmitted in the satellite uplink. 
           [0011]      FIG. 3  illustrates a code transmitted in the satellite uplink in alternate embodiments. 
           [0012]    The detailed description explains the exemplary embodiments, together with advantages and features, by way of example with reference to the drawings. 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0013]      FIG. 1  is a block diagram of an exemplary satellite system. In  FIG. 1 , a satellite uplink  10  transmits a signal to satellite  12  for distribution to a satellite downlink site  14 , such as a satellite gateway for distribution of the satellite signal. The satellite uplink  10  transmits the signal on a certain carrier frequency or channel. The double illumination problem arises when a second satellite uplink  11  transmits a signal on the same channel as uplink  10 . The satellite  12  receives both uplink signals and mixes the signals. The signal received at the satellite downlink  14  is a mix of the intended signal from satellite uplink  10  and the unwanted signal from satellite uplink  11 . 
         [0014]    Embodiments of the invention utilize a unique satellite uplink identification signal in the uplink transmission to identify the source of the satellite uplink&lt;signal. Further, the frequencies used by each uplink are also specified by an industry entity. This allows the operator of the satellite downlink  14  to quickly identify the unwanted satellite uplink  11  and contact the unwanted satellite uplink to cease transmission on that particular channel. As described in further detail herein the satellite downlink  14  is associated with a processor  20 , which accesses a database  24  over network  22 . This allows for prompt identification of the unwanted satellite uplink  11 . 
         [0015]      FIG. 2  illustrates an example of the satellite uplink identification signal.  FIG. 2  illustrates an uplink channel defined by a lower frequency band edge  100  and an upper frequency band edge  102 . In embodiments of the invention, the satellite uplink identification signal is transmitted on a frequency  106  within a frequency band  104  adjacent the upper frequency band edge  102 . In the exemplary embodiment shown in  FIG. 2 , frequency band  104  is 0.5 MHz wide. In the exemplary embodiment shown in  FIG. 2 , the uplink identification signal  106  uses 100 kHz, and thus may be placed in a variety of locations in the 0.5 MHz band  104 . The position of the uplink identification signal  106  may be varied to prevent uplink identification signals from overlapping each other. Additionally, the location of the uplink identification signal  106  in frequency band  104  may be used to identity a specific uplink or a group of uplinks assigned to that frequency. 
         [0016]      FIG. 3  shows an alternate embodiment where the uplink identification signal  106  is transmitted in a frequency band  104  adjacent to the lower frequency band edge  100 . In the exemplary embodiment shown in  FIG. 3 , the uplink identification signal  106  uses 100 kHz, and thus may be placed in a variety of locations in the 0.5 MHz band  104 . The position of the uplink identification signal  106  may be varied to prevent uplink identification signals from overlapping each other. Additionally, the location of the uplink identification signal  106  in frequency band  104  may be used to identity a specific uplink or a group of uplinks assigned to that frequency. 
         [0017]    The satellite uplink identification signal may be a continuous wave carrier modulated off/on by an identification code. In exemplary embodiments, the identification code may be a four character International Morse Code carrying the satellites uplink&#39;s unique identifier. The carrier frequency of the satellite uplink identification signal  106  should be transmitted at signal level (e.g., 20 db) below the main carrier. It is understood that other codes may be used and the use of International Morse Code is exemplary. For example, embodiments may represent the identification code using ASK, PSK, FSK type modulation. 
         [0018]    The identification signal is added within the upconverter of each satellite uplink. Generation of the identification signal is integral to the upconverter and shall not be easily disabled. The identification carrier frequencies may be located on 400 hertz centers starting at the transponder edge and going down in frequency. The Morse Code identification may be transmitted at 5 words per minute. The Morse Code keying of the carrier shall be shaped with a Blackman-Harris digital filter so that the sidebands of the identification signal shall be at least 100 db below an adjacent identification carrier 200 hertz from the sideband. 
         [0019]    The frequencies for each upconverter shall also be assigned by an industry entity and shall reside in a database  24 . Also, the four-character identification code for each satellite uplink shall be assigned by an industry entity and placed in database  24  available to all concerned parties (including regulatory entities such as the FCC). 
         [0020]    If a double illumination event occurs, the satellite downlink  14  receives the identification signal from both satellite uplinks  10  and  11 . Presumably, the identification signal from satellite uplink  10  is recognized at the downlink  14 . The identification code from unwanted satellite uplink  11  may be used by processor  20  (e.g., computer or server executing a computer program) to query database  24  containing identification codes for all satellite uplinks. The processor  20  may access database  24  over a network  22  (e.g., Internet, WAN, LAN, etc). The processor  20  and database  24  form an identification system that can automatically retrieve the identity of satellite uplink  11 . 
         [0021]    The database provides identification information for the satellite uplink  11 , including contact information, telephone numbers, geographic location, etc. The operator of satellite downlink  14  may then contact unwanted satellite uplink  11  to request cessation of the interfering signal. In alternate embodiments, an operator at the satellite downlink  14  may recognize the identification code (e.g., recognize the Morse code) in the transmission of the unwanted satellite uplink and identify the source. 
         [0022]    Additionally, the frequencies for each upconverter assigned by an industry entity are stored in database  24 . Thus, the frequency of the signal from the unwanted satellite uplink  11  may be used to identify the operator of the satellite uplink  11 . The uplink frequency and the identification code provide two mechanisms for identifying the satellite uplink  11  transmitting the unwanted signal. 
         [0023]    As described heretofore, the exemplary embodiments can be provided in the form of computer-implemented processes and apparatuses for practicing those processes. The exemplary embodiments can also be provided in the form of computer program code containing instructions embodied in tangible media, such as floppy diskettes, CD ROMs, hard drives, or any other computer-readable storage medium, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus for practicing the exemplary embodiments. The exemplary embodiments can also be provided in the form of computer program code, for example, whether stored in a storage medium, loaded into and/or executed by a computer, or transmitted over some transmission medium, loaded into and/or executed by a computer, or transmitted over some transmission medium, such as over electrical wiring or cabling, through fiber optics, or via electromagnetic radiation, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus for practicing the exemplary embodiments. When implemented on a general-purpose microprocessor, the computer program code segments configure the microprocessor to create specific logic circuits. 
         [0024]    While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed for carrying out this invention. Moreover, the use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another. Furthermore, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.