基于多通道天线高分辨率星载SAR 实现方法研究

对基于多通道天线实现高分辨率星载SAR的方法进行了深入研究,建立了三通道天线SAR的回波信号模型,提出了一种回波处理方式,将单发三收模式下的回波数据转变为传统的单发单收模式下的回波数据,可用常规条带式成像方法进行成像处理.对采用多通道天线实现高分辨率星载SAR涉及到的脉冲重复频率PRF偏离问题进行了深入分析和研究,推导出PRF偏离造成的虚假目标的理论位置和虚假目标与真实目标的峰值功率比值,计算机仿真试验证明了上述内容的有效性.

High resolution spaceborne SAR implementation method based on multiple phase centres antenna

An implementation method of high resolution spaceborne SAR based on multiple phase centres(MPC) antenna was studied, especially to the tri-phase centers antenna, as can effectively resolve the impact of resolution and swath extension. The echo signal model was proposed, and a method of processing the echo signal was discussed. In this method, the echo was transformed to the standard echo as usual one phase central antenna, which can be processed by traditional strip-mode imaging algorithm. The PRF departure’s influence on imaging performance was also deeply studied and the false target’s position and relative magnitude was given. The result of computer simulation proves the validity of the content.