基于小波分析的海洋磁力测量数据调差方法

针对传统测线网平差法在测区检查线数据缺失或测线网不规则布设时,测线系统差难以调整的问题,研究了基于小波多尺度分析的海洋磁力测量资料调差方法,利用小波多分辨率分析的功能,从低频真实磁异常信息中分离出相对高频的测线系统差,并讨论了小波分解阶数的选择对调差效果的影响。仿真分析表明,当二维小波分解阶数为1,一维分解阶数为4时,调差效果最好,分离出的测线系统差与仿真误差差值的均方差仅为0.29nT,均值仅为-0.35nT,验证了小波多尺度分析法用于海洋磁力测量数据调差的可行性。

Adjustment of Marine Magnetic Survey Data with Wavelet Multi-scale Analysis Method

In view of the problem that systematic error along a line is difficult to adjust with the traditional survey network adjustment method in situations of inadequate check line data or irregular line network layout,the adjustment method based on wavelet multi-scale analysis for marine magnetic survey data is studied.The function of the wavelet multiresolution analysis is used to separate the relatively high frequency systematic error from low frequency magnetic anomaly information,and the influence that the choice of wavelet decomposition order on adjusting result is discussed.Simulation analysis shows that,when the order of the two-dimensional wavelet decomposition is 1,and the order of one-dimensional decomposition is 4,the adjusting result is best.The mean square error and the average value of the difference between systematic error along survey line separated and simulation error are 0.29nT and -0.35nT respectively.The feasibility of using wavelet multiscale analysis method to adjust marine magnetic data is verified.