Transmitter independent techniques to extend the performance of passive coherent location
First Claim
1. A method of tracking a target using passive coherent location, comprising the steps of:
- receiving, at a plurality of receivers, reflections of radio signals from target, the radio signals being generated by one or more of uncontrolled or controlled transmitter sources, at least one or more of the plurality of receivers not in a line-of-sight to the transmitter sources,identifying the reflections of the radio signals as reflections from the target;
analyzing the reflections of the radio signals by one or more of analyzing analog television information patterns, analyzing FM modulation characteristics, and through spectral analysis of the reflections of the radio signals to determine a transmitter source,measuring a time difference of arrival of the reflections of the radio signals at the plurality of receivers, anddetermining target position from the time difference of arrival of the reflections of the radio signals.
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Abstract
Methods to improve the performance of passive coherent location by non-reliance on a direct view of the signal source are described. Passive Coherent Location, or PCL, has become a promising technology as more computer-processing power has become generally available. Basically, most PCL techniques rely on comparing signal sources with their reflections from an object in order to determine the location of the object. However, this requires line of sight access from the receiver system to the signal source which may not always be practical and may limit the performance of the system overall. The techniques described herein do not require line of sight to the transmitter sources.
456 Citations
12 Claims
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1. A method of tracking a target using passive coherent location, comprising the steps of:
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receiving, at a plurality of receivers, reflections of radio signals from target, the radio signals being generated by one or more of uncontrolled or controlled transmitter sources, at least one or more of the plurality of receivers not in a line-of-sight to the transmitter sources, identifying the reflections of the radio signals as reflections from the target; analyzing the reflections of the radio signals by one or more of analyzing analog television information patterns, analyzing FM modulation characteristics, and through spectral analysis of the reflections of the radio signals to determine a transmitter source, measuring a time difference of arrival of the reflections of the radio signals at the plurality of receivers, and determining target position from the time difference of arrival of the reflections of the radio signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for tracking a target reflecting radio signals, the system comprising:
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a plurality of receivers receiving reflections of radio signals from target, the radio signals being generated by one or more of uncontrolled or controlled transmitter sources, one of the plurality of receivers not being in line-of-sight with one or more of the uncontrolled or controlled transmitter sources, a detector identifying reflections of radio signals reflected from the target and measuring a time difference of arrival of the reflections of the radio signals at the plurality of receivers, an analyzer analyzing the reflections of the radio signals by one or more of analyzing analog television information patterns, analyzing FM modulation characteristics, and through spectral analysis of the reflections of the radio signals to determine a transmitter source, and a calculator for determining target position from the time difference of arrival of the reflections of the radio signals. - View Dependent Claims (9, 10, 11, 12)
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Specification