弹载侧视合成孔径雷达信号分析及成像研究

本文探讨了装载在导弹上的侧视合成孔径雷达(SAR)在导弹下降飞行过程中回波信号的特性和成像处理问题.根据导弹在要求合成孔径雷达成像期间内的飞行特点,建立了SAR工作的空间几何模型和目标距离表达式,分析了目标距离的时间变化特性和工作过程中多普勒参数的变化.由于要求成像的过程中,导弹的高度在不断减小,多普勒参数变化大,不能用同一参数对整个成像过程进行处理.分析和仿真表明,通过采用子孔径处理,能够得到聚焦的子孔径图像.

Signal Analysis and Imaging Processing of Missile-Borne Side-looking SAR

This paper concern the issue of signal characteristic and imaging processing of missile-borne side-looking SAR during its descending flight.According to the flight speciality of missile,the geometric model and target range expression are built.The features of range variation with time in single aperture and Doppler parameter variation with operation time are analysed.Because of the altitude decreasing during SAR operation,Doppler parameters change notably and constant Doppler parameters are not suitable for the imaging processing of entire operation period.Analysis and simulation show that focused image can be obtained by employing sub-aperture processing.