联合误差估计的机载超高分辨率SAR成像

doi:10.19665/j.issn1001-2400.2019.03.001

Abstract

Abstract:

For very high resolution synthetic aperture radar(VHR-SAR), SAR image quality is affected by nonlinear trajectory. To solve this problem, we propose an approach for very high resolution imaging based on motion error estimation. First, inertial navigation system(INS)information is projected on the slant-plane to obtain the motion error, and the coarse range-variant error is compensated by interpolation operation. A modified range migration algorithm(RMA) based on the new Stolt interpolation kernel is proposed and a corresponding motion error estimation method is also proposed to estimate phase errors by the use of sub-aperture error estimation and full aperture error fitting. Then the map-drift(MD) algorithm is used to obtain residual azimuth-variant phase errors estimation. After the above procedures, we obtain the VHR-SAR image with the resolution of 0.05 m, and experimental results of X-band and Ku-band airborne data demonstrate the effectiveness of the proposed method.

Key words: very high resolution, inertial navigation system, Stolt interpolation, range-variant, range migration algorithm

CLC Number:

TN957

JING Guobin,LI Ning,SUN Guangcai,XING Mengdao. Very high resolution SAR imaging method combined with motion estimation[J].Journal of Xidian University, 2019, 46(3): 1-7.

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References 13

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Very high resolution SAR imaging method combined with motion estimation

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