编队干涉SAR系统空间构形倾角确定准则研究

基于直角坐标系三维相对位置表示系统空间基线,提出了编队干涉SAR系统的构形倾角选择原则.以编队系统相对运动特性为出发点,从InSAR成像几何角度建立了编队干涉SAR系统高程测量模型并推导了系统高程测量误差影响模型.进而,给定空间基线各分量测量误差,在有效基线和投影基线固定情况下分别推导了系统构形倾角与高程测量误差的关系并进行了理论分析.数学仿真结果表明:当系统有效基线长度固定时,可以近似认为系统构形倾角不影响高程测量精度;当系统垂直于飞行轨迹向投影基线固定时,取系统构形倾角近似等于雷达波束中心视线角可以使基线测量误差对高程测量精度影响最小.

Determination principle of configuration angle on formation design of distributed SAR system

On the basis of space baselines in relative motion coordinate(rectangular Cartesian coordinate),the determination principle of the configuration angle on formation design of distributed SAR systems is proposed.From the view of InSAR imaging geometric,the height measurement and its error function are developed.And,the space baseline vector measurement precision is given,the function between system configuration angle and height measurement precision is presented in the conditions of the fixed effective baseline and the fixed vertical baseline.Simulation results show that the system configuration angle has little effect on height measurement while the effective baseline is fixed.And in order to make the system optimal precision,the system configuration angle must be equal to the radar beam look angle for the fixed vertical baseline.