Mobile sense through the wall radar system
First Claim
1. A method for sensing a target through a wall or obstruction by a Moving Target Indicator (MTI) radar sensor and including a transmitter and a receiver, comprising:
- transmitting a series of radar pulses at frequencies less than about 5 GHz;
receiving radar return signals from a plurality of receive antenna array subapertures;
processing the radar return signals from each of the plurality of receive antenna subapertures in respective receive channels each corresponding to a respective receive antenna subaperture to;
digitize analog radar return signals and provide complex time samples of the radar return signals;
process the complex time samples by a digital beamformer to form multiple beams;
process the beamformer outputs through a complex FFT processor to provide a range matrix map of clutter and targets for each channel;
process a time series of range matrix maps comprising a coherent processing interval through a Doppler compression function to provide range-Doppler maps indicating moving target velocities at each range;
performing target detection processing on the outputs of the Doppler compression function for each channel to detect moving and stationary targets through a plurality of parallel target detection signal processing paths, to provide target detection signals representing detected moving and stationary targets and their range and angular location; and
providing the target detection signals to an operator interface.
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Accused Products
Abstract
A method and apparatus for sensing a target through a wall or obstruction by a Moving Target Indicator (MTI) radar sensor. In an exemplary embodiment, a series of radar pulses are transmitted at frequencies less than about 5 GHz. Radar return signals are received at a plurality of receive antenna array subapertures. The radar return signals are processed by a digital beamformer to form multiple beams. Target detection processing detects moving and stationary targets through a plurality of parallel target detection signal processing paths.
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Citations
21 Claims
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1. A method for sensing a target through a wall or obstruction by a Moving Target Indicator (MTI) radar sensor and including a transmitter and a receiver, comprising:
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transmitting a series of radar pulses at frequencies less than about 5 GHz; receiving radar return signals from a plurality of receive antenna array subapertures; processing the radar return signals from each of the plurality of receive antenna subapertures in respective receive channels each corresponding to a respective receive antenna subaperture to; digitize analog radar return signals and provide complex time samples of the radar return signals; process the complex time samples by a digital beamformer to form multiple beams; process the beamformer outputs through a complex FFT processor to provide a range matrix map of clutter and targets for each channel; process a time series of range matrix maps comprising a coherent processing interval through a Doppler compression function to provide range-Doppler maps indicating moving target velocities at each range; performing target detection processing on the outputs of the Doppler compression function for each channel to detect moving and stationary targets through a plurality of parallel target detection signal processing paths, to provide target detection signals representing detected moving and stationary targets and their range and angular location; and providing the target detection signals to an operator interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A portable hand-held Moving Target Indicator (MTI) radar sensor for sensing a target through a wall or obstruction, comprising:
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a transmitter for transmitting a series of radar pulses at L-band or S-band; an antenna array including a transmit subaperture coupled to the transmitter and a plurality of receive subapertures; a radar receiver responsive to radar return signals from each of the plurality of receive subapertures for generating time domain signals representative of radar return signals in a plurality of receiver channels; an operator interface including a display; a radar signal processor configured to process the radar return signals from each of the plurality of receive subapertures in the respective receiver channels, the processor configured to; digitize analog radar return signals and provide complex time samples of the radar return signals; process the complex time samples by a digital beamformer to form multiple overlapping beams spaced across the radar field of view; process the beamformer outputs through a complex FFT processor to provide a range matrix map of clutter and targets for each channel; process the range matrix maps through a Doppler compression function over multiple range matrix maps comprising a coherent processing interval to provide range-Doppler maps indicating moving target velocities at each range; perform target detection processing on the output of the Doppler compression function for each channel to detect walking and stationary targets through a plurality of parallel target detection signal processing paths, to provide target detection signals representing detected walking and stationary targets and their range and angular location; and provide the target detection signals to the operator interface. - View Dependent Claims (19, 20, 21)
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Specification