A New Deramp-NECS Imaging Algorithm for Missile-Borne Hybrid SAR  

作　　者：XU Huaping ZHU Yadi KANG Changhui ZHOU Yinqing 

机构地区：[1]School of Electronic and Information Engineering, Beihang University, Beijing 100191, China

出　　处：《Chinese Journal of Electronics》2011年第4期769-774,共6页电子学报（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China （No.60901055） and Aeronautic Foundation of China （No.20090151001）.

摘　　要：A new imaging method, Deramp-nonlinear extended chirp scaling （Deramp-NECS） algorithm, was proposed for high resolution squint missile-borne hybrid Synthetic aperture radar （SAR） in high speed dive tra- jectory. The hybridization degree of missile-borne hybrid SAR in dive trajectory was redefined. Then the equivalent range model and the expressions of echo signals were pre-sented. By analyzing the missile-borne hybrid SAR echo signal, it was presented that the cubic-order phase item existed and had to be compensated. Deramp-NECS algo- rithm was put forward to implement the missile-borne hybrid SAR imaging. It firstly solves the azimuth spectrum aliasing using deramp processing with constant Doppler frequency modulation rate to realize the coarse focusing in azimuth. Then the improved CS principle introducing non-linear frequency compensation is used to get the fine focusing in range, while the azimuth errors caused by deramp processing are also compensated to realize the fine focusing in azimuth. Finally, computer simulation is employed to validate the availability.

关 键 词：SAR Imaging algorithm Missile borne Hybrid mode Phase compensation. 

分 类 号：TN958[电子电信—信号与信息处理] TQ051.72[电子电信—信息与通信工程]