旋转加速度计重力梯度仪数据处理方法  

Data processing method for rotating accelerometer gravity gradiometer

作　　者：钱学武[1] 蔡体菁[1] 

机构地区：[1]东南大学仪器科学与工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2016年第4期708-712,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA060501)

摘　　要：为了有效去除旋转加速度计重力梯度仪输出信号中的各种干扰噪声,提出了一种提取重力梯度信号的有效方法.首先对重力梯度仪输出信号进行故障诊断,然后采用基于Chebyshev最佳一致逼近法设计的带通滤波器对故障诊断后的信号进行滤波,并对滤波后的重力梯度信号进行梯度解调,最后采用dmey小波基函数强制阈值方法对解调后的重力梯度信息做进一步去噪处理.在重力梯度半物理仿真平台上进行了仿真试验测试,结果表明,所提方法可以有效降低有用信号均方差,不会造成数据丢失和信号偏移,提高了重力梯度测量精度.In order to remove the noise in the output signals of the rotating accelerometer gravity gradiometer instrument（ GGI）,an effective method for extracting the gravity gradient signal is presented. First,the fault diagnosis is carried out to preprocess the output signals of the GGI. Then a bandpassing filter based on the Chebyshev optimal uniform approximation method is used to filtrate the diagnosed signals,and the output signals of the band-pass filter are demodulated in the next step. Finally,the gravity gradient is further denoised by the compulsory threshold method based on the demy wavelet function. The proposed method is tested on the gravity gradient hard-in-the-loop simulation platform. The simulation results showthat the method can effectively reduce the mean square deviation of the useful signals and avoid data loss or signal offset. Therefore,the method can improve the precision of the gravity gradiometer.

关 键 词：重力梯度仪 旋转加速度计 梯度解调 带通滤波 小波去噪 

分 类 号：U666.1[交通运输工程—船舶及航道工程]