| 捷联式海洋重力数据的小波阈值滤波 |
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| 引用本文： | 韦建成,肖云,王利,孟宁,邹嘉盛.捷联式海洋重力数据的小波阈值滤波[J].大地测量与地球动力学,2019,39(11):1132-1136. |
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| 作者姓名： | 韦建成 肖云 王利 孟宁 邹嘉盛 |
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| 作者单位： | 长安大学地质工程与测绘学院,西安市雁塔路126号,710054;地理信息工程国家重点实验室,西安市雁塔路中段1号,710054;中国电子科技集团公司第20研究所,西安市白沙路1号,710054;地理信息工程国家重点实验室,西安市雁塔路中段1号,710054;西安测绘研究所,西安市雁塔路中段1号,710054;长安大学地质工程与测绘学院,西安市雁塔路126号,710054;地理信息工程国家重点实验室,西安市雁塔路中段1号,710054 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;中央高校基本科研业务费专项;中央高校基本科研业务费专项;中央高校基本科研业务费专项 |
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| 摘 要： | 基于捷联式海洋重力测量数据，对比不同小波、阈值及施加方式对滤波效果的影响。结果表明，db6、db7、db8、db9、db10、sym6、sym7、sym8、sym9、sym10、coif3、coif4和coif5小波较适用于海洋重力测量，小波分解层次可取至8层或9层，采用史坦无偏风险阈值滤波效果较好；小波分解至第8、9层时，阈值滤波结果与截止频率为0.005 Hz和0.003 3 Hz的Butterworth低通滤波器的滤波结果吻合较好，但小波阈值滤波结果更加平滑，两者差值的RMSE在0.25 mGal以内，且小波阈值滤波更容易分解出噪声成分，可以更有效地消除重力畸变。
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| 关 键 词： | 捷联式海洋重力测量 小波阈值 Butterworth低通滤波器 |
Filtering of Strapdown Marine Gravity Data by Wavelet Threshold |
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| WEI Jiancheng,XIAO Yun,WANG Li,MENG Ning,ZOU Jiasheng.Filtering of Strapdown Marine Gravity Data by Wavelet Threshold[J].Journal of Geodesy and Geodynamics,2019,39(11):1132-1136. |
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| Authors: | WEI Jiancheng XIAO Yun WANG Li MENG Ning ZOU Jiasheng |
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| Abstract: | Based on strapdown marine gravity real data, we check the effectiveness of using wavelet threshold in filtering marine gravity anomaly. We test different wavelet, threshold techniques and decomposition levels. Results show that the db6, db7, db8, db9, db10, sym6, sym7, sym8, sym9, sym10, coif3, coif4 and coif5 are the thirteen wavelets suited for marine gravimetry, and wavelet decomposition level can be taken to 8 or 9 layers. The unbiased risk threshold filtering effect is better. When the wavelet is decomposed into the 8th and 9th layers, the result of the wavelet threshold filtering agrees well with the filtering results using the Butterworth low-pass filter with 0.005 Hz and 0.0033 Hz cut-off frequency, but the result of the wavelet threshold filtering is more smoothing than the Butterworth low-pass filter. Further, the RMSE of the difference between the two filtering results is within 0.25 mGal. Wavelet threshold filtering is easier to decompose the noise component than the Butterworth low-pass filter, which can eliminate gravity distortion more effectively. |
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| Keywords: | strapdown marine gravimetry wavelet thresholding Butterworth low-pass filter |
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