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15 results on '"Zhou, Xinghua"'

10. Equivalence of network-solution and PPP-solution

Author

Zhou Xinghua, Peng Lin, Wu Yongting, and Liu Yanxiong

Subjects
Troposphere, Matrix (mathematics), Control theory, business.industry, Geography, Planning and Development, Global Positioning System, Applied mathematics, Computers in Earth Sciences, Precise Point Positioning, business, Equivalence (measure theory), Mathematics
Abstract

The technique of precise point positioning (PPP) is gradually becoming a popular method in GPS data-processing. In GPS observation equation, the unknown parameters can be separated into two parts: global parameters and local parameters. The global parameters include orbit, satellite clock and geodynamic parameters. The local parameters are site-occupation-spectific, such as position, tropospheric delay, etc. The formulas of local parameters are firstly derived under the network-solution and the PPP-solution conditions respectively. If the weight matrix of global parameters in PPP-solution is small enough, the cofactor matrices of local parameters are the same as that in network-solution. Then, 16 daily solutions are obtained in both PPP mode and network mode. Three sites are selected to compare the solutions. The experimental results demonstrated that the difference between two solutions in coordinates and tropospheric delays are only few millimeters. This level of difference can be neglected so that the ...

Published
2006

11. Seafloor sediment classification based on multibeam sonar data

Author

Zhou Xinghua and Chen Yongqi

Subjects
Geography, Planning and Development, Power spectral analysis, Computers in Earth Sciences, Hydrography, Sonar, Seabed, Seafloor spreading, Geology, Remote sensing
Abstract

The multibeam sonars can provide hydrographic quality depth data as well as hold the potential to provide calibrated measurements of the seafloor acoustic backscattering strength. There has been much interest in utilizing backscatters and images from multibeam sonar for seabed type identification and most results are obtained. This paper has presented a focused review of several main methods and recent developments of seafloor classification utilizing multibeam sonar data or/and images. These are including the power spectral analysis methods, the texture analysis, traditional Bayesian classification theory and the most active neural network approaches.

Published
2004

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