A Novel Method for Real-Time Monitoring of Channel Siltation Based on Bistatic S

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6Nm(_4HAKk4w2N)h0A Novel Method for Real-Time Monitoring of Channel Siltation Based on Bistatic Scattering Theory

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侯朋 许文海 王俊生 李瑛

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【摘要】:Monitoring the thickness changes of channel siltation is paramount in safeguarding navigation and guiding dredging.This paper presents a novel method for realizing the field monitoring of channel siltation in real time.The method is based on the bistatic scattering theory and concerned more with the receiving and processing of multipath signal at high-frequency and small grazing angle.By use of the multipath propagation structure of underwater acoustic channel,the method obtains the silt thickness by calculating the relative time delay of acoustic signals between the direct and the shortest bottom reflected paths.Bistatic transducer pairs are employed to transmit and receive the acoustic signals,and the GPS time synchronization technology is introduced to synchronize the transmitter and receiver.The WRELAX (Weighted Fourier transform and RELAX) algorithm is used to obtain the high resolution estimation of multipath time delay.To examine the feasibility of the presented method and the accuracy and precision of the developed system,a series of sea trials are conducted in the southwest coast area of Dalian City,north of the Yellow Sea.The experimental results are compared with that using high-resolution dual echo sounder HydroBoxTM,and the uncertainty is smaller than ±0.06 m.Compared with the existing means for measuring the silt thickness,the present method is innovative,and the system is stable,efficient and provides a better real-time performance.It especially suits monitoring the narrow channel with rapid changes of siltation.

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channel siltation;real-time monitoring;bistatic bottom scattering;relative time delay;WRELAX;multipath signal

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【基金】:supported by the National Key Technology Research and Development Program of China(863 Program, Grant No.2009BAG18B03)

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-[&`;X3|L,A|7r01 .IntroductionThe siltation of channel is quite commoninthe world,and because of its direct influence onthenavigation safety of ships and shipping efficiency,the related countries have attached great importanceto carrying out a variety of researches ont

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