机载双基地SAR的扩展SIM算法  

Extended SIM algorithm for airborne bistatic SAR

作　　者：蔡复青[1] 何友[1] 宋杰[1] 葛先军[1] 

机构地区：[1]海军航空工程学院信息融合研究所,山东烟台264001

出　　处：《系统工程与电子技术》2009年第10期2346-2349,2479,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(60672139;60672140)资助课题

摘　　要：提出了适用于平移不变模式斜视双基地SAR的扩展SIM(squint imaging mode)算法。首先利用方位多普勒频率去斜,解决了斜视双基地SAR的能量模糊问题,然后推导得到方位去斜后信号的二维频谱数学表达式,并在此基础上构造了新的匹配滤波函数。最后通过计算机仿真验证了扩展SIM方法的有效性,对成像质量的改进效果进行了分析。The extended SIM algorithm for translational invariant bistatic SAR imaging is proposed. Firstly, the power ambiguity problem of squint bistatic SAR is solved by using the azimuth Doppler frequecy demodulation. Then the two dimensional spectrum of the azimuth demodulated signal is derived, and the new match filtering functions are composed based on it. Finally, the validity of the algorithm is tested by the simulation, and the enhancement of image quality by the new algorithm is analyzed.

关 键 词：双基地合成孔径雷达 扩展SIM算法 方位去斜 平移不变模式 

分 类 号：TN958[电子电信—信号与信息处理]