ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Airborne SAR space-variant motion compensation algorithm based on numerical calculation
Received date: 2014-03-20
Revised date: 2014-11-03
Online published: 2014-11-15
Supported by
Aeronautical Science Foundation of China (20132007001);Defense Industrial Technology Development Program (B2520110008); NUAA Fundamental Research Funds (NS2013023)
Aimed at the imaging problems of high resolution wide swath (HRWS) airborne synthetic aperture radar (SAR), on the basis of conventional range migration algorithm with integrated two-step motion compensation, a new space-variant motion compensation algorithm based on numerical calculation is proposed for HRWS airborne SAR. This algorithm compensates the spatial-variant motion error in the two-dimensional wavenumber domain by transforming the coarsely focused image to block. The compensated phase includes azimuth phase error, range phase error and the coupling phase of range and azimuth. So the proposed algorithm can work well for the HRWS SAR data with complex flight path. Finally, The new proposed algorithm is compared with range migration algorithm with integrated two-step motion compensation by processing simulation data and real data. Real data processing results demonstrate that the algorithm can better compensate the spatial-variant motion error.
SONG Wei , ZHU Daiyin , YE Shaohua . Airborne SAR space-variant motion compensation algorithm based on numerical calculation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(2) : 625 -632 . DOI: 10.7527/S1000-6893.2014.0311
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