A novel initial altitude error estimation method base on autofocus for high-speed diving SAR

The initial altitude error (IAE) of high-speed diving vehicle can be as large as several kilometers, which results in serious defocus, position shift and geometry distortion for synthetic aperture radar image. In this paper, a novel IAE estimation method based on the principle of autofocus is proposed. The genetic algorithm (GA) is applied to solve the optimization model with advantages of global optimum and parallelizability. The simulation results confirm that the precision can reach meter level with high stability.

[1]  Xiaoling Zhang,et al.  A Less-Memory and High-Efficiency Autofocus Back Projection Algorithm for SAR Imaging , 2015, IEEE Geoscience and Remote Sensing Letters.

[2]  Huaping Xu,et al.  A VARIABLE PRF IMAGING METHOD FOR HIGH SQUINT DIVING SAR , 2013 .

[3]  Ian G. Cumming,et al.  Processing of Azimuth-Invariant Bistatic SAR Data Using the Range Doppler Algorithm , 2008, IEEE Transactions on Geoscience and Remote Sensing.

[4]  Shuning Zhang,et al.  A New Chirp Scaling Algorithm for Highly Squinted Missile-Borne SAR Based on FrFT , 2015, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[5]  J. P. Ruina,et al.  Some Early Developments in Synthetic Aperture Radar Systems , 1962, IRE Transactions on Military Electronics.

[6]  Karim Faez,et al.  A back-projection autofocus algorithm based on flight trajectory optimization for synthetic aperture radar imaging , 2016, Multidimens. Syst. Signal Process..

[7]  Jun Shi,et al.  Streaming BP for Non-Linear Motion Compensation SAR Imaging Based on GPU , 2013, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[8]  Junjie Wu,et al.  An Omega-$k$ Imaging Algorithm for Translational Variant Bistatic SAR Based on Linearization Theory , 2014, IEEE Geoscience and Remote Sensing Letters.

[9]  Joshua N. Ash,et al.  An Autofocus Method for Backprojection Imagery in Synthetic Aperture Radar , 2012, IEEE Geoscience and Remote Sensing Letters.

[10]  Linrang Zhang,et al.  An Omega-K Algorithm for Highly Squinted Missile-Borne SAR With Constant Acceleration , 2014, IEEE Geoscience and Remote Sensing Letters.

[11]  Xiaoling Zhang,et al.  A novel synthetic bandwidth method based on BP imaging for stepped-frequency SAR , 2016 .

[12]  R. B. Horsfall.  Stellar Inertial Navigation , 1958, IRE Transactions on Aeronautical and Navigational Electronics.