小波变换在船载海洋重力测量数据处理与分析中的应用

doi:10.12305/j.issn.1001-506X.2023.03.05

Abstract

Abstract:

Shipborne gravimetry is one of the critical methods for obtaining marine earth gravity field information. In order to improve the accuracy of shipborne gravimetry data, Db8 and Haar wavelet transform methods are used to denoise the gravity data with two kinds of random noise. The results show that the absolute accuracy of gravity data is improved by 1.024 2 mGal and 9.274 7 mGal, and the relative accuracy is increased by 71% and 93% after Db8 wavelet transform processing. After Haar wavelet transform processing, the absolute accuracy of gravity data is improved by 0.804 4 mGal and 9.109 5 mGal, and the relative accuracy is increased by 56% and 91%. The data can retain the basic trend after noise reduction. It can provide a basis for gravity exploration.

Key words: shipborne gravimetry, Daubechies (Db) wavelet, Haar wavelet, error ratio

CLC Number:

P223

Bei LIU, Shaofeng BIAN, Bing JI, Pengfei XIAN. Application of wavelet transform in shipborne ocean gravimetry data processing and analysis[J]. Systems Engineering and Electronics, 2023, 45(3): 654-659.

Figures/Tables 15

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前校时间	后校时间	漂移/mGal
前校时间	后校时间	总漂移	日漂移	月漂移
2020/09/23 13:00:00	2020/11/02 1:00:00	5.71	0.14	4.2

测线	均方根误差
B1A/B1B	0.24
D1A/D1B	0.33
L1A/L1B	0.27
L3A/L3B	0.41
Z1A/Z1B	0.19

误差类型	未变换	Db8	Haar
5倍随机误差	1.442 1	0.417 9	0.637 7
正态随机误差	10.002 2	0.727 5	0.892 7

误差类型	Db8	Haar
5倍随机误差	0.71	0.56
正态随机误差	0.92	0.91

误差类型	未变换	Db8	Haar
5倍随机误差	0.071 5	0.010 1	0.010 3
正态随机误差	0.511 1	0.011 0	0.010 8

Application of wavelet transform in shipborne ocean gravimetry data processing and analysis

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