机载InSAR系统精度分析

结合SAR成像原理,在提出了基于DGPS/IMU数据的机载InSAR系统DEM三维坐标求解的基础上,推导出了基线长度、基线倾角、相位差、雷达天线到地面目标点的距离、雷达天线位置、中心多普勒频率及飞机飞行速度等因素误差对DEM精度的影响公式,分析讨论了机载InSAR系统影响精度的主要因素及系统可实现的性能情况,提出了机载InSAR系统部分设计建议,并使用实际的机载InSAR数据进行了试验。结果表明,本方法结果与实际试验统计的精度基本一致,影响精度的分析结论正确。

Accuracy Analysis of Airborne InSAR System

Accuracy analysis is the precondition of a system’s production accuracy ensure,through which it is helpful to determine the systemic performance indexs and some technical parameters in order to make the system design easily.In the article,combined with the SAR imaging principles,especially on the basis of presenting the solution of DEM’s three dimension coordinates in airborne InSAR system with DGPS/IMU data,deduced the DEM precision influence formulas caused by several errors factors such as base line length,base line inclination,phase difference,distance from the SAR antenna to the ground target points,SAR antenna’s position,center Doppler and the plane’s velocity,in order to improve the systemic precision then analyzed the main influencing accuracy factors in airborne InSAR system and the systemic realizable performance condition,meanwhile proposed some design suggestions of the airborne InSAR system and made experiments on the real airborne InSAR data.In the article,the results indicated from the methods of accuracy analysis is accordant with the statistical precision using real experimental data,and the conclusions influencing accuracy analysis are correct.