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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。
Position and orientation system (POS) is the key device to improve the imaging quality of ground observation by InSAR. Based on the demand of on-board InSAR motion error compensation, the position and orientation system (POS) The dimension effect of inertial measurement unit (IMU) is designed. A light-sensitive and symmetrical eight-point inertial sensor structure is designed. The data acquisition and pre-processing module based on DSP + FPGA hardware is designed. A time-delay compensation method based on filter modeling was developed and a prototype of a small high-precision laser gyro POS for high-resolution airborne earth observation system was successfully developed. The experimental static, vehicle and flight test results show that the pure inertial navigation errors of the system are 0.196nmile / h, 0.659nmile / h and 0.681nmile / h, respectively, which meets the accuracy requirements of airborne InSAR 0.5 m.