摘要
为了得到分布式POS在进行传递对准过程中由于大气扰动产生的挠曲变形姿态误差,以及这些误差与干涉式合成孔径雷达(InSAR)高程测量误差间的对应关系,提出了一种利用"速度+姿态"的传递对准方法,并利用它的误差来作为高程测量模型的输入,最后得出载机在传递对准过程中导致的高程测量误差。为了验证实验,搭建了分布式测量平台,针对该平台,首先根据机翼杆的挠曲变形运动模型增加载机y方向的变形角为Kalman滤波的状态变量,从而进行更精确的估计和补偿。然后推导了InSAR干涉测量的绝对误差表达式以及参数的选取。最后根据滤波结果和高度误差机理分析了横滚角误差对InSAR的高程信息产生的影响。通过仿真分析,传递对准得到的水平失准角误差小于0.009°,方位失准角误差小于0.015°,并且在横滚角误差为±0.089°时,高程误差小于4.2 m。
In order to get the flexural angel error caused by distributed POS due to atmospheric disturbances and find this error’s corresponding relationship with the altitude error caused by interferometric synthetic aperture radar(InSAR), a transfer alignment method using the'velocity+attitude'matching algorithm was proposed. Then the error of the estimation is used as the input parameter of the height measurement model to obtained the altitude error caused during transfer alignment. A distributed measurement platform was built to verify the experiment, and the following analyses were made about the platform:1) according to the motion model of the flexural wings, the flexural angel in y coordinate axis was added to the Kalman filter’s state variables; 2) the absolute error expressions of InSAR interferometry measurement and the method of selecting the parameters was deduced; 3) according to the filtering results and the mechanism of altitude measurement, the roll angel error’s influence on InSAR altitude information was analyzed. The simulation results show that the horizontal and azimuth misalignments by the proposed method are superior to 0.009° and 0.015° respectively, and when the roll angel error is within ±0.089°, the altitude error is less than 4.2 m.
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2014年第4期432-438,共7页
Journal of Chinese Inertial Technology
基金
国家重大科学仪器设备开发专项项目(2012YQ160185)
关键词
分布式POS
传递对准
INSAR
干涉测量
Algorithms
Alignment
Information filtering
Interferometry
Synthetic aperture radar
