运动误差对机载SAR定位精度的影响

Influence of the motion error to airborne SAR geolocation accuracy

定位精度是合成孔径雷达(SAR)系统的一项重要指标。本文在影响SAR定位精度的诸多因素中,主要研究了运动误差对定位精度的影响问题。首先建立了SAR定位模型,然后从成像的角度分析了距离向运动误差和方位向运动误差对定位精度的影响,推导了运动误差影响定位精度的数学表达式,对影响SAR定位精度的雷达参数进行了分析,并进行了仿真实验。仿真结果表明:距离向速度误差是影响SAR定位精度的主要因素,定位精度还与斜视角和飞行速度有关。本文可为SAR系统定位精度指标设计提供理论支撑。

Geolocation accuracy is an important criterion of synthetic aperture radar （SAR） system. This paper studies the problem of the motion error＇s influence to the geolocation accuracy. Firstly , it constructs the geolocation model of SAR ;secondly it analyzes the influence of the motion error in range and in azimuth to geolocation accuracy at the imaging point of view ;then it induces the math expressions of the influence , and analyzes the radar parameters which can affect the SAR geolocation accuracy ; finally it makes the simulation. The simulation results show that the range motion error is the most fact affecting the SAR geolocation accuracy, which also related to the squint angle and the velocity. This paper provides the theory support for the design of the geolocation accuracy criterion of the SAR system.