Application of the Bispectrum Method to the Microtopographic Measurement of Co-Rich Crust at the Ocean Bottom
详细信息
- 责任者：Zhou Zhijin (College of Mechanical Engineering ; Hunan University of Science and Technology ; Xiangtan 411201 ; China) ; Luo Bowen
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2010
- 卷期：34(3)
- 关键词：富钴结壳 ; cobalt-rich crust ; 地形测量学 ; topographic surveying
- 页码：p.348-352
- 图表：4 illus., 1 table, 11 refs.
- 分类号：2100
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
Under the actual marine environment, the underwater ultrasonic measurement system has a certain limitation because of mechanical noises such as background noise and reverberation noise. The bispectrum time delay estimation method with Gaussian noise has shielding capacity and is capable of suppressing noise. This method adopts an accurate estimation of the signal time delay, and its power spectral bispectrum reconstruction is superior to the direct use of FFT transform power spectrum estimation, thus having relatively high precision and performance. In view of underwater ultrasonic detection deficiencies, the bispectrum estimation method is adopted due to its insensitivity to background noise. According to measured data obtained in laboratory pool, the applicability of the method is verified. The results show that the bispectrum method has better applicability than the cross-correlation method under the conditions of less prior knowledge and strong background noise.