Passive locating system
First Claim
1. A locating system comprising:
- a receiver for generating digital time domain signal samples related to a signal source;
a transform processor for generating digital frequency domain signal samples in response to the digital time domain signal samples generated by said receiver;
an adder circuit for generating the digital summed frequency domain signal samples as pseudo noise digital summed frequency domain signal samples that are suitable for correlation processing by selectively adding the plurality of digital frequency domain signal samples from the array of digital frequency domain signal sampled generated by said transform processor;
a time difference processor for generating time difference signal samples by processing the digital summed signal samples generated by said adder circuit, said time difference processor including a correlation processor for generating the time difference signal samples by correlation processing of the pseudo noise digital summed signal samples generated by said adder circuit; and
a location processor for generating a location parameter defining location of a signal source in response to the time difference signal samples generated by said time difference processor.
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Accused Products
Abstract
A passive surveillance system provides ranging and location capability of a signal source. A single receiver in a multipath environment or alternatively a plurality of receivers receive the signal from the source having different propagation delays along different paths. Selection of corresponding frequency components from different paths and mixing of the corresponding selected frequency components from each of the paths generates complex pseudo-noise signals that are suitable for correlation processing. Correlation processing of the mixed signals yields the time difference between the multiple paths. The maximum time difference parameters for each path are used to generate a locus line, either explicitly or implicitly. Range and location processing of the locus information identifies range and location of the signal source.
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Citations
20 Claims
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1. A locating system comprising:
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a receiver for generating digital time domain signal samples related to a signal source; a transform processor for generating digital frequency domain signal samples in response to the digital time domain signal samples generated by said receiver; an adder circuit for generating the digital summed frequency domain signal samples as pseudo noise digital summed frequency domain signal samples that are suitable for correlation processing by selectively adding the plurality of digital frequency domain signal samples from the array of digital frequency domain signal sampled generated by said transform processor; a time difference processor for generating time difference signal samples by processing the digital summed signal samples generated by said adder circuit, said time difference processor including a correlation processor for generating the time difference signal samples by correlation processing of the pseudo noise digital summed signal samples generated by said adder circuit; and a location processor for generating a location parameter defining location of a signal source in response to the time difference signal samples generated by said time difference processor. - View Dependent Claims (2, 3, 4, 5)
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6. A locating system comprising:
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a receiver for generating digital time domain signal samples related to a signal source; a transform processor for generating digital frequency domain signal samples in response to the digital time domain signal samples generated by said receiver; an adder circuit for generating the digital summed frequency domain signal samples as pseudo noise digital summed frequency domain signal samples that are suitable for correlation processing by selectively adding the plurality of digital frequency domain signal samples from the array of digital frequency domain signal sampled generated by said transform processor; a time difference processor for generating time difference signal samples by processing the digital summed signal samples generated by said adder circuit, said time difference processor including a correlation processor for generating the time difference signal samples by correlation processing of the pseudo noise digital summed signal samples generated by said adder circuit; a location processor for generating a location parameter defining location of a signal source in response to the time difference signal samples generated by said time difference processor; and an operator keyboard selection circuit for operator selection of the plurality of digital frequency domain signal samples generated by said transform processor that are selectively added by said adder circuit for generating digital summed frequency domain signal samples.
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7. A locating system comprising:
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a receiver for generating digital time domain signal samples related to a signal source; a transform processor for generating digital frequency domain signal samples in response to the digital time domain signal samples generated by said receiver; an adder circuit for generating digital summed frequency domain signal samples by selectively adding a plurality of digital frequency domain signal samples generated by said transform processor; a correlation processor for generating correlated signal samples by correlating the digital summed signal samples generated by said adder circuit; and a location processor for generating a location parameter defining location of a signal source in response to the correlated signal samples generated by said correlation processor. - View Dependent Claims (8, 9, 10, 11)
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12. A locating system comprising:
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a receiver for generating digital time domain signal samples related to a signal source; a transform processor for generating digital frequency domain signal samples in response to the digital time domain signal samples generated by said receiver; an adder circuit for generating pseudo noise signal samples that are suitable for correlation processing by selectively adding a plurality of digital frequency domain signal samples generated by said transform processor; a correlation processor for generating correlated signal samples by correlating the pseudo noise signal samples generated by said adder circuit; and a location processor for generating a location parameter defining location of a signal source in response to the correlated signal samples generated by said correlation processor. - View Dependent Claims (13, 14, 15)
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16. A locating system comprising:
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a receiver for generating an array of digital time domain signal samples related to a signal source; a transform processor for generating an array of digital frequency domain signal samples in response to the array of digital time domain signal samples generated by said receiver; a selection circuit for selecting a plurality of frequency signal samples from the array of digital frequency domain signal samples generated by said transform processor; an adder circuit for generating summed signal samples by adding the plurality of frequency signal samples selected by said selection circuit; a correlation processor for generating correlated signal samples by correlating the summed signal samples generated by said adder circuit; a peak detector circuit for generating a time parameter defining the time relation of a peak of the correlated signal samples generated by said correlation processor; and a location processor for generating a location parameter defining location of a signal source in response to the time parameter generated by said peak detector circuit. - View Dependent Claims (17, 18, 19, 20)
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Specification