机载SAR系统平台运动容差分配方法

A Method of Allowable Platform Motion Errors Allocation in Airborne SAR System

合成孔径雷达(SAR)系统平台运动容差分配是系统要求分配的一个重要方面,它是系统设计中的必要步骤,通过考虑误差源、误差影响和性能极限等因素使得最终的设计方案更为合理。该文在分析和仿真平台运动误差对SAR成像质量的影响的基础上,提出了一种机载SAR系统平台运动容差分配的方法:根据实际成像系统和成像环境搭建仿真平台后,通过仿真实验逐步得到独立运动误差容限、联合运动误差容限和修正运动误差容限,最后考虑一些相关因素在前面仿真所得的容限区域上合理地做出平台运动容差分配的最后决策。这种方法将系统的平台参数、平台运动误差的类型和方向、测绘宽度以及成像质量要求等因素均作为分配过程的约束条件,是一种兼具针对性和合理性的SAR系统平台运动容差分配方法。

Allowable platform motion error allocation is an important part of system-wide allocation in SAR system. It is a necessary system design procedure to take into account error effects, error sources, and performance-limiting factors to determine more reasonable design. Based on analysis and simulation of impact of platform motion errors on SAR image quality, a method is proposed of allowable platform motion errors allocations in airborne SAR system. Firstly, according to actual imaging system and environment, simulation mode is built; and then allowable self-existent motion errors, allowable coexistent motion errors, modified allowable motion errors are in turn obtained; finally, considering some associated factor, reasonable project is decided. As the method counts in platform and image parameter values, type and direction of platform motion errors and scene size, it has both pertinence and rationality.