Abstract
Multichannel synthetic aperture radar (SAR) is a breakthrough given the inherent limitation between high-resolution and wide-swath (HRWS) faced with conventional SAR. This paper aims to obtain unambiguous imaging of static scenes and moving targets with the first Chinese dual-channel spaceborne SAR sensor. We propose an integrated imaging scheme with the dual-channel echoes. In the imaging scheme, the subspace-based error estimation algorithm is first applied to the spaceborne multichannel SAR system, followed by the reconstruction algorithm prior to imaging. The motion-adapted reconstruction algorithm for moving target imaging is initially achieved with the spaceborne multichannel SAR system. The results exhibit an effective suppression of azimuth ambiguities and false targets with the proposed process. This paper verifies the accuracy of the subspace-based channel error estimator and the feasibility of the motion-adapted reconstruction algorithm. The proposed imaging process has prospects for future HRWS SAR systems with more channels.
Highlights
Spaceborne synthetic aperture radar (SAR) sensors are an increasingly influential tool for remote sensing of the Earth
We propose an integrated unambiguous imaging algorithm, moving target estimation, and imaging algorithm with Chinese Gaofen-3 dual receive channel (DRC) mode
From the results of phase error estimation and the azimuth ambiguity-to-signal ratio (AASR), the traditional correlation method and the orthogonal subspace method (OSM) are comparable in performance
Summary
Spaceborne synthetic aperture radar (SAR) sensors are an increasingly influential tool for remote sensing of the Earth. The multichannel SAR system has been proposed to obtain high-resolution and wide-swath (HRWS) imaging simultaneously by splitting the antenna into multiple receive channels in azimuth [1,2,3,4]. Low PRF is transmitted to obtain an unambiguous wide swath, echoes of multiple receivers are combined to improve the azimuth resolution and eliminate azimuth ambiguities. The feasibility of this mode was first verified by the German satellite TerraSAR-X launched in 2007 [3], by the Japanese satellite AlOS-2 launched in 2014 [4], which both contain dual receive channels. The echoes of multichannel SAR are always non-uniformly sampled
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