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中文摘要：
位置姿态系统（position and orientation system,POS）是机载干涉合成孔径雷达（interferential synthetic aperture radar,InSAR）提高对地观测成像质量的关键装置,围绕机载InSAR运动误差补偿的需求,分析了机抖激光陀螺惯性测量系统（inertialmeasurement unit,IMU）的尺寸效应,设计了一种轻小型、对称八点减振的惯性敏感组件结构;设计了基于DSP＋FPGA硬件方案的数据采集及预处理模块,提出了基于滤波器建模的时延补偿方法,研制成功一种高分辨率机载对地观测系统用小型高精度激光陀螺POS样机。实验室静态、车载以及飞行试验结果表明该系统纯惯性导航误差分别为0.196 nmile/h、0.659 nmile/h和0.681 nmile/h,满足了机载InSAR 0.5 m高程精度需求。
英文摘要：
Position and orientation system （POS） is the key equipment for improving the image resolution of synthetic aperture radar （SAR）. According to the motion compensation requirement of SAR, the size effect of dither ring laser gyroscope （RLG） inertial measurement unit （IMU） was analyzed. A small size structure of inertial sensitive assemble with eight absorbers was designed. Based on the DSP ＋ FPGA hardware scheme, a data collecting and pre- processing module was designed. Based on digital filter model, a time-delay compensation method was proposed. Fi- nally, a small size high precision RLG POS was successfully developed. The experiment results show that the static inertial navigation error of RLG inertial system is 0. 196 nmile/h. The inertial navigation errors are 0. 659 nmile/h and 0.681 nmile/h for vehicle and airborne experiments, respectively. The developed RLG POS meets the require- ments of improving SAR image resolution.
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