Abstract
The azimuth multichannel imaging scheme with the large receive antenna divided into multiple sub-apertures usually leads to azimuth non-uniform sampling, and echoes from all azimuth channels should be reconstructed based on the signal model before conventional SAR imaging. Unfortunately, the multichannel signal model of a moving target is different from that of a fixed target. This paper analyzes the multichannel signal model of the moving target and the effect of the target velocity on azimuth multichannel reconstruction. Based on the multichannel signal mode of the moving target, a new multichannel signal reconstruction algorithm is proposed. Furthermore, the slant range velocity is estimated by computing signal energy distribution. Simulation results on point targets validate the proposed approach.
Highlights
Geometric resolution and swath width are two of most important parameters for spaceborne synthetic aperture radar (SAR) systems
The azimuth multichannel signal model of the moving target is described, and imaging results of the azimuth multichannel raw data of moving targets handled by the conventional approach [3,4] for the fixed scene are presented
This paper proposes a new approach of the target slant range velocity estimation based on the energy distribution of the azimuth reconstructed signal in the Doppler domain
Summary
Geometric resolution and swath width are two of most important parameters for spaceborne synthetic aperture radar (SAR) systems. Multiple azimuth multichannel reconstruction algorithms have been proposed for different SAR imaging modes based on the multichannel signal mode of the fixed target [2,3,4]. The azimuth multichannel signal model of the moving target is described, and imaging results of the azimuth multichannel raw data of moving targets handled by the conventional approach [3,4] for the fixed scene are presented. The key point of the proposed approach is the multichannel phase calibration based on the signal mode of the moving target Another important processing step of azimuth multichannel reconstruction for moving targets is the target velocity estimation. This paper proposes a new approach of the target slant range velocity estimation based on the energy distribution of the azimuth reconstructed signal in the Doppler domain.
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