去斜滑动聚束模式SAR方位模糊度分析

Azimuth Ambiguity Analysis of Deramping Sliding Spotlight Mode SAR

方位向模糊度是衡量合成孔径雷达(SAR)成像的重要指标之一,但传统的条带模式和聚束模式的方位模糊度函数并不适用于滑动聚束模式。通过分析方位模糊度的来源及条带模式和聚束模式的方位模糊度函数,对滑动聚束模式进行细分并分析其方位模糊度函数,同时针对星载滑动聚束模式的去频谱混叠条件分析了其方位向模糊度函数的变化。最后采用实际的星载SAR参数进行系统仿真,为SAR系统的设计提供了可靠的理论依据。

The azimuth ambiguity is a key character to scale the image quality of Synthetic Aperture Radar（SAR）,but the traditional expressions in strip-map and spotlight don＇t match the situation in sliding spotlight.The origin of the azimuth ambiguity and the azimuth ambiguity expressions of strip-map and spotlight is first analyzed,then focuses on the working mode of sliding spotlight and constructs its azimuth ambiguity expression.For the space-borne deramping sliding spotlight SAR,further analysis on azimuth ambiguity are made.The corresponding system design and simulation are made at last using reliable space-borne parameters,which provides effectual reference for SAR system design.