System and method for direction finding and geolocation of emitters based on line-of-bearing intersections
First Claim
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1. A system for locating an emitter comprising:
- a plurality of antennas including a first antenna with a first radiation pattern and a second different antenna with a second radiation pattern different from the first radiation pattern, wherein the first and second radiation patterns provide a received signal gain with respect to signals received from said emitter;
a receiver to receive signals from each of said plurality of antennas transmitted by said emitter and obtain received signal strength measurements of said received signals at a plurality of different locations; and
a processor to process said received signal strength measurements to locate said emitter, wherein said processor includes;
a location module to;
process said received signal strength measurements and determine lines-of-bearing to said emitter based on a combination of received signal strength measurements of a signal received by each of said first antenna and said second antenna at said plurality of different locations; and
determine a location of said emitter based on intersections of said lines-of-bearing to said emitter at said plurality of different locations.
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Abstract
According to an embodiment of the present invention an emitter geolocation technique determines the geolocation of a radio frequency (RF) emitter using pair-wise line-of-bearing intersections that are derived from signal-to-noise ratios of transmitted signals received at a sensor. The technique may be employed with ground based vehicle or small unmanned air vehicles (UAV), and obtains reliable geolocation estimates of radio frequency (RF) emitters of interest.
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Citations
49 Claims
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1. A system for locating an emitter comprising:
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a plurality of antennas including a first antenna with a first radiation pattern and a second different antenna with a second radiation pattern different from the first radiation pattern, wherein the first and second radiation patterns provide a received signal gain with respect to signals received from said emitter; a receiver to receive signals from each of said plurality of antennas transmitted by said emitter and obtain received signal strength measurements of said received signals at a plurality of different locations; and a processor to process said received signal strength measurements to locate said emitter, wherein said processor includes; a location module to; process said received signal strength measurements and determine lines-of-bearing to said emitter based on a combination of received signal strength measurements of a signal received by each of said first antenna and said second antenna at said plurality of different locations; and determine a location of said emitter based on intersections of said lines-of-bearing to said emitter at said plurality of different locations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for locating an emitter comprising:
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(a) receiving signals transmitted by said emitter via each of a plurality of antennas including a first antenna with a first radiation pattern and a second different antenna with a second radiation pattern different from the first radiation pattern, wherein the first and second radiation patterns provide a received signal gain with respect to signals received from said emitter, and obtaining received signal strength measurements of said received signals at a plurality of different locations; and (b) processing said received signal strength measurements, via a processor, and determining lines-of-bearing to said emitter based on a combination of received signal strength measurements of a signal received by each of said first antenna and said second antenna at said plurality of different locations to determine a location of said emitter based on intersections of said lines-of-bearing to said emitter at said plurality of different locations. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A program product apparatus comprising a non-transitory computer readable memory device with computer program logic recorded thereon for locating an emitter, wherein a receiver receives signals transmitted by said emitter via each of a plurality of antennas including a first antenna with a first radiation pattern and a second different antenna with a second radiation pattern different from the first radiation pattern to obtain received signal strength measurements of said received signals at a plurality of different locations, said program product apparatus further comprising:
a location module to process said received signal strength measurements of signals transmitted by said emitter and obtained at a plurality of different locations, and determine lines-of-bearing to said emitter based on a combination of received signal strength measurements of a signal received by each of said first antenna and said second antenna at said plurality of different locations to determine a location of said emitter based on intersections of aid lines-of-bearing to said emitter at said plurality of different locations. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
Specification