Numerical simulation and inversion of offshore area depth based on x-band microwave radar
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Numerical simulation and inversion of offshore area depth based on x-band microwave radar WANG Li1, WU Xiongbin1*, PI Xiaoshan1, MA Ketao1, LIU Jianfei1, TIAN Yun1 1
Radio Oceanography Laboratory, School of Electronic Information, Wuhan University Wuhan 430079, China Received 28 February 2014; accepted 27 May 2014 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2015
Abstract A detection method of offshore area depth utilizing the x-band microwave radar is proposed. The method is based on the sea clutter imaging mechanism of microwave radar, and combined with dispersion equation of the liner wave theorem and least square method (LSM), consequently get the inversion results of water depth in the detected region. The wave monitoring system OSMAR-X exploited by the Ocean State Laboratory, Wuhan University, based on a microwave radar has proven to be a powerful tool to monitor ocean waves in time and space. Numerical simulation and inversion of offshore area depth are carried out here; since JONSWAP model can give description of stormy waves in different growth phase, it is suitable for simulation. Besides, some results from measured data detected by OSMAR-X x-band radar located at Longhai of Fujian Province, China, validates this method. The tendency of the average water depths inferred from the radar images is in good agreement with the tide level detected by Xiamen tide station. These promising results suggest the possibility of using OSMAR-X to monitor operationally morphodynamics in coastal zones. This method can be applied to both shore-based and shipborne x-band microwave radar. Key words: microwave radar, offshore area depth, JONSWAP model, numerical simulation, liner wave theorem Citation: Wang Li, Wu Xiongbin, Pi Xiaoshan, Ma Ketao, Liu Jianfei, Tian Yun. 2015. Numerical simulation and inversion of offshore area depth based on x-band microwave radar. Acta Oceanologica Sinica, 34(3): 108–114, doi: 10.1007/s13131-015-0626-7
1 Introduction Radio detection, one of the most important geophysical prospecting methods, has great advantages over other detection approaches in some areas such as remote sensing, telemetering, subsurface fluid detection and marine environmental monitoring. The measurement of shallow sea depth involves the measuring of the height of the bottom to the surface and the location of the water particles, and it is the pivotal point of seaway and submarine topography surveying (Wang et al., 2011; Chen and Bai, 2011), as it provides the depth of the channel, location and obstacle for ship navigation. In short, the terrain detection of the littoral shallow sea waters has significant impact on navigation, fishery, harbor and oil/gas pipelines under the sea. Traditional measuring technologies like sounding pole, sounding lead and fathometer, as it is known, with limited measurement range and sometimes disabled in shallow waters, tend to be expensive, time-consuming and cannot meet engineering application. Consequently, more efficient measuring technologies are appealed to.
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