Joint synthetic aperture radar plus ground moving target indicator from single-channel radar using compressive sensing
| DWPI Title: System for radar in aircraft, has signal generator component that receive first transmission timing such that generating first signal at selected first transmission timing |
| Abstract: The various embodiments presented herein relate to utilizing an operational single-channel radar to collect and process synthetic aperture radar (SAR) and ground moving target indicator (GMTI) imagery from a same set of radar returns. In an embodiment, data is collected by randomly staggering a slow-time pulse repetition interval (PRI) over a SAR aperture such that a number of transmitted pulses in the SAR aperture is preserved with respect to standard SAR, but many of the pulses are spaced very closely enabling movers (e.g., targets) to be resolved, wherein a relative velocity of the movers places them outside of the SAR ground patch. The various embodiments of image reconstruction can be based on compressed sensing inversion from undersampled data, which can be solved efficiently using such techniques as Bregman iteration. The various embodiments enable high-quality SAR reconstruction, and high-quality GMTI reconstruction from the same set of radar returns. |
| Use: System for radar in aircraft. |
| Advantage: The SAR imaging and GMTI mover detection are conducted by randomly timing transmission of the chirp or pulse, enabling both closely- and widely-spaced data. The amount of transmit power deposited on the scene is increased while maintaining signal-to-noise ratio (SNR). GMTI is utilized to reduce the number of pulses transmitted and received, reducing size, weight and/or power (SWaP) on a mobile platform. The number of pulses are transmitted, combined and selected in a manner that reduces an operational overhead associated with the amount of data being worked. The GMTI images are so sparse, favorable reconstruction performance is achieved even at small fractions of the original GMTI rate. |
| Novelty: The system (100) has a controller (130) that receive a first/second frequency value which is a frequency for signaling in accordance with a synthetic aperture radar (SAR) imaging (170) schema/ground moving target indication (GMTI) (175) schema. The controller generates possible transmission timings at which a signal is to be transmitted during a timing window and selects first transmission timing for a first instance of signal transmission. A signal generator component (115) receives first transmission timing and generates a first signal at selected first transmission timing. |
| Filed: 1/7/2015 |
| Application Number: US14591519A |
| Tech ID: SD 12594.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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