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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (2): 625-632.doi: 10.7527/S1000-6893.2014.0311

• Electronics and Control • Previous Articles     Next Articles

Airborne SAR space-variant motion compensation algorithm based on numerical calculation

SONG Wei1,2, ZHU Daiyin1, YE Shaohua2   

  1. 1. College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. AVIC Leihua Electronic Technology Research Institute, Wuxi 214063, China
  • Received:2014-03-20 Revised:2014-11-03 Online:2015-02-15 Published:2014-11-15
  • Supported by:

    Aeronautical Science Foundation of China (20132007001);Defense Industrial Technology Development Program (B2520110008); NUAA Fundamental Research Funds (NS2013023)

Abstract:

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.

Key words: airborne SAR, wide swath, spatial-variant motion error, two-step motion compensation, range migration algorithm

CLC Number: