SYSTEM AND METHODS FOR MULTISTEP TARGET DETECTION AND PARAMETER ESTIMATION
First Claim
1. A method of detecting one or more targets comprising:
- a. generating one or more target hypotheses in a Doppler-shift/time delay plane based on one or more curves of one or more cross ambiguity functions of one or more transmitted signals and their received reflections from the one or more targets; and
b. determining one or more coordinates of the one or more targets in the Doppler-shift/time delay plane by validating the one or more generated target hypotheses,wherein the Doppler-shift/time delay plane is a cross-ambiguity function Doppler-shift/time plane.
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Abstract
A system and methods for multistep target detection and parameter estimation which utilizes slices and/or projections of the cross-ambiguity function of the transmitted and received signals of a sensor system is disclosed. The system and methods of the present invention offer a computationally efficient means of detecting targets while achieving a high probability of detection and a reduced false alarm rate. Detection and parameter estimation of targets is accomplished by generating hypotheses and then validating the generated hypotheses. The hypotheses are generated using slices and/or projections of cross-ambiguity functions of transmitted signals and reflections received from the targets without the need to compute the entire cross-ambiguity function. After hypotheses are generated they are validated by determining the amplitude of a cross-ambiguity function at the coordinates of the hypotheses and comparing the amplitude to a predetermined threshold.
66 Citations
21 Claims
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1. A method of detecting one or more targets comprising:
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a. generating one or more target hypotheses in a Doppler-shift/time delay plane based on one or more curves of one or more cross ambiguity functions of one or more transmitted signals and their received reflections from the one or more targets; and b. determining one or more coordinates of the one or more targets in the Doppler-shift/time delay plane by validating the one or more generated target hypotheses, wherein the Doppler-shift/time delay plane is a cross-ambiguity function Doppler-shift/time plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15)
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13. A system for detecting one or more targets comprising:
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a. a waveform generator; b. a signal transmitter; c. a signal receiver; and d. a detection processor comprising; i. a curve processor; ii. a target hypothesis generator configured to generate cross-ambiguity function Doppler-shift/time delay coordinates of one or more target hypotheses based on curves of one or more cross-ambiguity functions; and iii. a hypothesis validation processor. - View Dependent Claims (14)
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16. A system for detecting one or more targets comprising:
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a. means for generating one or more target hypotheses in a Doppler-shift/time delay plane based on one or more curves of one or more cross ambiguity functions of one or more transmitted signals and their received reflections from the one or more targets; and b. means for determining one or more coordinates of the one or more targets in the Doppler-shift/time delay plane by validating the one or more generated target hypotheses, wherein the Doppler-shift/time delay plane is a cross-ambiguity function Doppler-shift/time plane. - View Dependent Claims (17, 18)
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19. A computer program product comprising a medium with instructions stored thereon that cause a computer system to:
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a. generate one or more target hypotheses in a Doppler-shift/time delay plane based on one or more curves of one or more cross ambiguity functions of one or more transmitted signals and their received reflections from the one or more targets; and b. determine one or more coordinates of the one or more targets in the Doppler-shift/time delay plane by validating the one or more generated target hypotheses, wherein the Doppler-shift/time delay plane is a cross-ambiguity function Doppler-shift/time plane. - View Dependent Claims (20, 21)
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Specification