MULTI-PIXEL HIGH-RESOLUTION THREE-DIMENSIONAL IMAGING RADAR
First Claim
1. A radar imaging system, comprising:
- a quasioptical device for dividing a source transmit beam into a first transmit beam and a second transmit beam and multiplexing them, where both the first transmit beam and the second transmit beam are directed to be reflected off a target such that the second transmit beam is time-delayed from the first transmit beam to correspond to a distinct IF frequency for demultiplexing and processing and received as a single multiplexed receive signal with the quasioptical device; and
a system for signal mixing and a digital signal processor for performing fast Fourier transform (FFT) processing for demultiplexing and processing the single multiplexed receive signal to determine range information of the target for both a first pixel from the first transmit beam and a second pixel from the second transmit beam.
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Accused Products
Abstract
A three-dimensional imaging radar operating at high frequency e.g., 670 GHz radar using low phase-noise synthesizers and a fast chirper to generate a frequency-modulated continuous-wave (FMCW) waveform, is disclosed that operates with a multiplexed beam to obtain range information simultaneously on multiple pixels of a target. A source transmit beam may be divided by a hybrid coupler into multiple transmit beams multiplexed together and directed to be reflected off a target and return as a single receive beam which is demultiplexed and processed to reveal range information of separate pixels of the target associated with each transmit beam simultaneously. The multiple transmit beams may be developed with appropriate optics to be temporally and spatially differentiated before being directed to the target. Temporal differentiation corresponds to a different intermediate frequencies separating the range information of the multiple pixels. Collinear transmit beams having differentiated polarizations may also be implemented.
244 Citations
20 Claims
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1. A radar imaging system, comprising:
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a quasioptical device for dividing a source transmit beam into a first transmit beam and a second transmit beam and multiplexing them, where both the first transmit beam and the second transmit beam are directed to be reflected off a target such that the second transmit beam is time-delayed from the first transmit beam to correspond to a distinct IF frequency for demultiplexing and processing and received as a single multiplexed receive signal with the quasioptical device; and a system for signal mixing and a digital signal processor for performing fast Fourier transform (FFT) processing for demultiplexing and processing the single multiplexed receive signal to determine range information of the target for both a first pixel from the first transmit beam and a second pixel from the second transmit beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of radar imaging, comprising:
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dividing a source transmit beam into a first transmit beam and a second transmit beam and multiplexing them with a quasioptical device; directing both the first transmit beam and the second transmit beam to be reflected off a target such that the second transmit beam is time-delayed from the first transmit beam to correspond to a distinct IF frequency for demultiplexing and processing and received as a single multiplexed receive signal with the quasioptical device; and signal mixing and performing fast Fourier transform (FFT) processing for demultiplexing and processing the single multiplexed receive signal to determine range information of the target for both a first pixel from the first transmit beam and a second pixel from the second transmit beam with a signal system and a digital signal processor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for multiplexing in a radar imaging system, comprising:
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a coupler for dividing the source transmit beam into a first transmit beam and a second transmit beam and multiplexing them; a polarization twist waveguide for rotating polarization of the second transmit beam relative to that of the first transmit beam; quasioptical components for imparting a path length differential to induce a time delay between the second transmit beam and the first transmit beam and for directing the first transmit beam and the second transmit beam to the target along a substantially parallel path with a spatial offset; wherein both the first transmit beam and the second transmit beam are directed to be reflected off a target and received as a single multiplexed receive signal by the quasioptical device and the single multiplexed receive signal is demultiplexed and processed to determine range information of the target for both a first pixel from the first transmit beam and a second pixel from the second transmit beam. - View Dependent Claims (20)
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Specification