摘要
基于一般构形双基合成孔径雷达(SAR)的空间几何关系,分析了一般构形双基SAR的特点,给出了一般构形双基SAR回波的多普勒参数表达式。由于一般空间构形双基SAR发、收平台的运动矢量是不相等的,造成双基系统对场景中每一个点目标的成像几何结构是不同的,因此成像处理中除了需要校正距离空变量外,还需要补偿方位空变量。星机构形的实例分析验证了这种方位空变性。文中对一般构形双基SAR空变多普勒参数分析的结果为系统参数选择和二维空变补偿成像处理提供了相关的基础。
Based on geometric relationship among platforms and character analysis of general bistatic SAR, expressions of Doppler parameters of general bistatic SAR system are presented in the paper. Analysis shows that the difference between the motion vector of transmitter and receiver cause the differen! image configuration for different point target in azimuth. So the Doppler parameters change with the different target and echoes spectrum is also different from the azimuth-invariant configuration and the algorithm must compensate two-dimensional variance. The simulation results verify the characteristics of variance. The conclusion deduced from the paper would be one basis for choosing the system parameters and focusing algorithm.
出处
《现代雷达》
CSCD
北大核心
2011年第11期23-26,31,共5页
Modern Radar
