一种基于回波数据相位改变的SAR目标保护方法

为了保证SAR回波数据安全,使得非法截获回波数据后无法从图像上获取重要目标信息,提出了一种基于回波数据相位改变的新方法。结合SAR成像原理,理论推导和分析了回波数据沿方位向增加一次相位引起的目标平移量的大小,以及增加二次相位引起的图像散焦,并通过点目标仿真直观呈现了成像效果。最后利用RADARSAT-1真实数据进行了仿真,仿真结果验证了该方法保护重要目标信息的可行性。

SAR Downlink Security Method Based on Echo Data Phase Changing

For ensuring SAR echo data security and preventing enemy from obtaining important targets information after intercepting the echo data,the paper presents a new method based on echo data phase changing.According to SAR imaging principle,the paper theoretically calculates and analyzes the magnitude of target shift caused by multiplying once phase and image defocus caused by multiplying twice phase,and then presents intuitive imaging effect with point target simulation.Finally,simulation with RADARSAT-1 real d...