海洋重力测量畸变的消除方法  

Eliminating method of abnormal deform for marine gravity measurements

作　　者：刘凤鸣 王建敏 

机构地区：[1]哈尔滨工程大学自动化学院,哈尔滨150001

出　　处：《中国惯性技术学报》2008年第2期204-207,211,共5页Journal of Chinese Inertial Technology

基　　金：国防科技预研项目(51309010201)

摘　　要：重力辅助导航进行匹配计算过程中,需要得到当前实时海洋重力数据,而海洋重力仪为了抑制垂直方向上干扰加速度,往往施加强阻尼对由垂直扰动加速度引起的采样质量的位移进行大幅度地压缩,但这同时引起测量得到的重力信号的畸变。因此,消除由于传感器强阻尼造成的重力数据畸变,获得高精度实时重力值,成为一个迫切的问题。为消除此畸变,采用反滤波方法对测量数据进行处理,达到实时获取当前重力异常数据的目的。通过仿真研究表明:反滤波技术可以恢复原始重力异常信号,减小由于强阻尼造成的幅值衰减和相位延迟,提高测量精度。The real-time sea gravity data is needed in the calculation of gravity-aided navigation. In order to restrain the disturbing acceleration in vertical direction, the sea gravimeter usually brings intensive damping to reduce the displacement of sampling mass caused by accelerations in vertical direction. But this also causes the distortion of gravity signal. So it becomes an urgent problem to eliminate gravity signal abnormal deform and get high precision real-time gravity dada. The inverse filtering approach was used to deal with gravity data and eliminate gravity signal abnormal deform. The simulation indicates that the inverse filtering technology can restore the signals of gravitational abnormal deform, eliminate amplitude attenuation and phase lag, and improve the measurement accuracy.

关 键 词：海洋重力仪 强阻尼 重力异常 反滤波 

分 类 号：U666.1[交通运输工程—船舶及航道工程]