Title :
Coherence-Improving Algorithm for Image Pairs of Bistatic SARs With Nonparallel Trajectories
Author :
Lv, Xiaolei ; Xing, Mengdao ; Deng, Yunkai ; Zhang, Shouhong ; Wu, YiRong
Author_Institution :
Nat. Key Lab. of Radar Signal Process., Xidian Univ., Xian, China
Abstract :
Ground moving target indication (GMTI) is one of the most important applications in a general bistatic synthetic aperture radar (SAR) system, where the transmitter and receiver move along nonparallel trajectories with different velocities. In order to improve the capability of clutter cancellation in bistatic SAR/GMTI processing, the coherence between two echoes collected by two receivers is investigated, and the full-coherence conditions are derived. A new coherence-improving algorithm for general bistatic SAR complex image pairs is proposed, which can be realized in the following steps: 2-D range azimuth prefiltering processing, relative geometric deformation correction, and image registration. An approximate implementation of 2-D prefiltering and the corresponding prefilter parameter analysis are also given. Last, two numerical experiment results are given to demonstrate the effectiveness of the proposed algorithm.
Keywords :
clutter; coherence; geophysical signal processing; image registration; radar signal processing; remote sensing by radar; synthetic aperture radar; 2D range azimuth prefiltering processing; SAR receiver; SAR transmitter; bistatic SAR image pairs; bistatic SAR-GMTI processing; bistatic synthetic aperture radar system; clutter cancellation; coherence improving algorithm; echo coherence; full coherence conditions; ground moving target indication; image registration; nonparallel trajectories; relative geometric deformation correction; 2-D prefilter; bistatic SAR; coherence; ground moving target indication (GMTI); image registration; synthetic aperture radar (SAR);
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
DOI :
10.1109/TGRS.2009.2018532
