基于瞬时多普勒频率的匀速移变双基SAR的二维频谱及其成像算法的应用  

New 2-D Spectrum of BiSAR from the Instantaneous Doppler Frequency and a Showcase for Image Algorithm

作　　者：熊涛[1] 周松[1] 邢孟道[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《电子与信息学报》2012年第8期1840-1846,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金重大项目(60890072)资助课题

摘　　要：该文提出一种新的方法求解匀速移变双基SAR的2维频谱表达式。通过使用瞬时多普勒频率,引入两个独立的方位频率,并由此推导出精确的严格解析谱。然后,利用匀速移变双基SAR的成像几何模型,求出这两个方位频率的表达式,从而得到最终的2维频谱。作为该频谱对于成像算法的一个应用,该文提出适用于平行等速双基SAR数据的距离多普勒算法。仿真数据的处理结果不仅证明了所得到的2维频谱的精确性,也证明了该文的距离多普勒算法的有效性。A novel method to obtain the formulations of the return signals in the two dimensional （2-D） frequency domain for translational variant Bistatic Synthetic Aperture Radar （BiSAR） is proposed. In this study, the instantaneous Doppler frequency is used and two individual azimuth frequencies are introduced, so that the 2-D spectrum can be derived by these two azimuth frequencies. Using the imaging geometry of the general bistatic SAR, the expressions of the two azimuth frequencies can be obtained, as well as the 2-D spectrum. Then, the range Doppler algorithm based on the two 2-D spectrums is developed to process the spotlight general BiSAR data. Finally, the proposed algorithms are applied to the simulated data and the results confirm not only the accuracy of the derived 2-D spectrums for general BiSAR but also the effectiveness of the proposed algorithm.

关 键 词：匀速移变双基SAR 瞬时多普勒频率 距离多普勒算法 

分 类 号：TN957.52[电子电信—信号与信息处理]