Statistical communication link
First Claim
1. A communications system for determining a state of a plurality of radios, each radio transmitting one of a plurality of unique signals based on the state of the particular radio, said communications system comprising a receiver system receiving the unique signals, said receiver system separating the unique signals from the plurality of radios and measuring the combined power for each group of separated unique signals, said receiver system determining the number of radios transmitting each unique signal based on the combined power.
4 Assignments
0 Petitions
Accused Products
Abstract
A communications system (34) that monitors a state of a plurality of radios (10). In one embodiment, the communications system (34) automatically and continuously monitors the number of radios (10) tuned to each of a plurality of available radio stations. Each radio (10) generates a coded signal depending on which radio station the radio (10) is currently tuned to. The coded signal is applied to a frequency generator (32) that generates a unique frequency signal for each code that is then transmitted by the radio (10). Each radio (10) tuned to the same station would transmit the same unique frequency signal at substantially the same power level. The frequency signals transmitted by all of the radios (10) are received by a receiver (34), such as a satellite-based receiver (34), that separates the signals by frequency. The power received for each different frequency signal is then measured to give a total power output for that frequency. An estimation of the number of transmission for each different frequency signal is determined as the measured power level minus the expected receiver noise power, divided by the expected received power from a transmission from a single radio (10).
6 Citations
17 Claims
- 1. A communications system for determining a state of a plurality of radios, each radio transmitting one of a plurality of unique signals based on the state of the particular radio, said communications system comprising a receiver system receiving the unique signals, said receiver system separating the unique signals from the plurality of radios and measuring the combined power for each group of separated unique signals, said receiver system determining the number of radios transmitting each unique signal based on the combined power.
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8. A system for providing an estimation of the number of radios tuned to each of a plurality of different radio stations, each of the radios transmitting one of a plurality of unique frequency signals based on which station that radio is tuned to, said system comprising:
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a plurality of bandpass filters, each filter passing the frequency signal of one of the unique frequency signals transmitted from the plurality of radios;
a plurality of power detectors, each of the power detectors receiving the frequency signals passed by one of the band pass filters, said power detectors providing a separate power measurement signal of the combined frequency signals received by the system for each of the unique frequency signals; and
a processor, said processor receiving the power measurement signals from each of the power detectors and providing an estimation of the number of radios tuned to a particular radio station based on the power measurement signal for each unique frequency signal, the expected noise of the system, and the expected received power for each signal transmitted by the radios. - View Dependent Claims (9, 10, 11, 12)
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- 13. A system for determining a state of a plurality of transmitters, each transmitter transmitting one of a plurality of predefined signals based on the state of that transmitter, said system comprising a receiver system receiving the predefined signals, said receiver system separating the predefined signals into groups of the same signal and measuring the combined power for each group of separated signals, said receiver system determining the number of transmitters transmitting each signal based on the combined power.
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15. A method of identifying a state of a plurality of radios, said method comprising the steps of:
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providing a plurality of radios where each radio transmits one of a plurality of unique signals based on the state of the particular radio;
receiving the unique signals transmitted by the plurality of radios in a common receiver;
separating the unique signals from the plurality of radios into groups in the receiver;
measuring the combined power for each group of separated unique signals; and
determining the number of radios transmitting each unique signal based on the combined power. - View Dependent Claims (16, 17)
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Specification