Multistatic target detection and geolocation
First Claim
1. A multistatic radar system comprising:
- a transmitter for transmitting a first signal at a first time to reflect off a target, the first signal reflecting off the target as a second signal at a second time;
a plurality of spatially separated receivers on corresponding geographically separated platforms, each of the receivers being configured to receive the second signal from the target as one of a corresponding plurality of third signals and at one of a corresponding plurality of third times; and
a signal processor for fusing the third signals and the third times from the receivers,wherein the fusing of the third signals and the third times comprises;
aligning the third signals in time delay and Doppler shift using the corresponding plurality of third times; and
summing the resulting aligned third signals to detect or geolocate the target at the second time.
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Abstract
Aspects of this invention are directed to the substantially improved detection and geolocation accuracy of targets (stationary or moving) by using the coherent data received at multiple airborne sensors. Further aspects are directed to aligning the (unknown) time-delayed and Doppler-shifted signals received at the multiple sensors relative to an arbitrary reference sensor, which depend on the unknown target position. This results in the target position and velocity vectors being simultaneously estimated and the detection peak enhanced by obtaining near coherent gain. Still further aspects are directed to the coherent generalized likelihood ratio test (GLRT) and the minimum variance distortionless response (MVDR) statistic for multistatic radar systems, conditioned on estimation of certain parameters that render the system coherent. Analytical and computer simulation results are presented to show substantially enhanced detection and geolocation of moving targets in clutter.
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Citations
20 Claims
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1. A multistatic radar system comprising:
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a transmitter for transmitting a first signal at a first time to reflect off a target, the first signal reflecting off the target as a second signal at a second time; a plurality of spatially separated receivers on corresponding geographically separated platforms, each of the receivers being configured to receive the second signal from the target as one of a corresponding plurality of third signals and at one of a corresponding plurality of third times; and a signal processor for fusing the third signals and the third times from the receivers, wherein the fusing of the third signals and the third times comprises; aligning the third signals in time delay and Doppler shift using the corresponding plurality of third times; and summing the resulting aligned third signals to detect or geolocate the target at the second time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of detection and geolocation of a target by a multistatic radar system comprising a transmitter, a plurality of spatially separated receivers on corresponding geographically separated platforms, and a signal processor, the method comprising:
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transmitting a first signal at a first time from the transmitter to the target, the first signal reflecting off the target as a second signal at a second time; receiving the second signal in the receivers on the corresponding geographically separated platforms, each of the receivers receiving the second signal from the target as one of a corresponding plurality of third signals and at one of a corresponding plurality of third times; and fusing the third signals and the third times from the receivers on the signal processor, comprising; aligning the third signals in time delay and Doppler shift using the corresponding plurality of third times; and summing the resulting aligned third signals to detect or geolocate the target at the second time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification