高精度海洋重力仪系统误差建模研究

Research on error modeling and error simulation of marine gravimeter

导出高精度海洋重力仪系统的速度控制方程、角速度控制方程和纬度控制方程。以高精度海洋重力仪系统中平台的横倾角、纵倾角、运载体的东向速度误差、北向速度误差和运载体的纬度误差为变量，导出高精度海洋重力仪系统误差模型，并进行了系统误差仿真实验．理论分析和仿真实验表明：高精度海洋重力仪的系统误差形成过程分为误差积累、误差衰减和误差稳定三个阶段；0—1800s是系统误差积累阶段，最大系统误差约为3．0×10^-6m／s^2；由于水平阻尼网络的作用，从1800～3000s是仪系统误差衰减阶段；3000s以后，系统误差进入稳定阶段，仿真4000s时，系统误差约为2．246×10^-6m／s^2。

Control equations of marine gravimeter＇s velocity, angular speed and latitude are deduced in the paper. Heel angle of gravimeter platform, trimming angle of gravimeter platform, east velocity error of carrier, north velocity error of carrier and latitude error of carrier are used as variables, and the error model of marine gravimeter is established. According to the error model of marine gravimeter, the error simulation experiment is carried out. Theoretical analysis and simulation experiment indicate that the formative processes of marine gravimeter error can been segmented into error accumulated phase, error damped phase and error stable phase. Error accumulated phase of navigation gravimeter is from 0 - 1800 second, and the maximum error is 3.0 × 10^-6 m/s^2. Owing to horizontal damp, error damped phase of marine gravimeter is from 1800- 3000 second. Error stable phase is from 3000 second and the error of navigation gravimeter is 2. 246 × 10^-6 m/s^2 in 4000 second.