Abstract
Spaceborne Azimuth Multichannel BiSAR With Geosynchronous Transmitter and LEO Receiver: High-Resolution Wide-Swath Image Formation
Highlights
Geosynchronous synthetic aperture radar (GEO-SAR) system, located at about 35768 km above the Earth’s surface, can provide excellent coverage performance and high temporal resolution [1]–[4]
EXPERIMENTAL RESULTS simulation experiments of high-resolution wide-swath (HRWS) imaging for GEO-LEO azimuth multichannel (AMC)-bistatic synthetic aperture radar (BiSAR) are carried out to demonstrate the effectiveness of the proposed method
The comparison results of target 3 and target 15 obtained by these imaging algorithms are demonstrated in Fig. 15 and Fig.16, respectively
Summary
Geosynchronous synthetic aperture radar (GEO-SAR) system, located at about 35768 km above the Earth’s surface, can provide excellent coverage performance and high temporal resolution [1]–[4]. The first one is the invalidation of ‘‘Stop-and-Go’’ assumption for GEO-LEO BiSAR focusing because of long round-trip time and high receiver speed. The third issue in inclined GEO-LEO AMC-BiSARs is that echo signal has strong coupling and spatial-variant characteristics in both range and azimuth direction, which is caused by nonlinear and nonparallel trajectories of transmitter and receiver. The signal model of GEO-LEO AMC-BiSAR is established and the method of reconstructing unambiguous SAR spectrum is presented. The signal model of GEOLEO azimuth AMC-BiSAR is presented, and the time-variant and spatial-variant characteristics of residual phase error after the derived EPC processing are analyzed. The residual errors of slant range obtained by the ‘‘Stop-and-Go’’ assumption and the proposed model of (1) with the simulation time of 1.5s are illustrated in Fig.3(a) and (b), respectively.
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