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The Research and Implementation on Processing Algorithm of DVL

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Tutor: QiaoGang
School: Harbin Engineering University
Course: Underwater Acoustics
Keywords: DVL,processing algorithm,DSP,VC++
CLC: U674.703.4
Type: Master's thesis
Year:  2011
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Abstract:
DVL (Doppler Velocity Log) is one of the navigation equipments on ship. With the development of marine technology, more and more countries and institutions began to study it, especially the one for deep sea environment.Velocity compensation was once a bottleneck to improve the accuracy. The application of phased-array technique on sonar solved this problem in theory, which made the performance of Doppler log greatly improved. In this thesis, we made further study on this kind of Doppler log.In this thesis, three frequency estimation algorithms have been researched:FFT algorithm, Zero-cross algorithm and Complex-covariance algorithm. Their performances in frequency estimation have been compared in matlab simulation environment. In the part of software development, the software of signal simulator was developed on CCS platform. To make sure the simulator¡¯s real-time performance, look-up table algorithm was used which reduced the calculation time of sine function in DSP greatly. The system flow and interfaces between different parts were designed in the DSP control software, including the self-test process, search and follow algorithm in different water depths. And the display and control software which would display the waves and frequency measurement in real-time was developed on Visual C++ platform; it implements user interaction with the system as well. In the part of data process, a lot of work was done on the data smoothing algorithm in this thesis, especially the relation of outliers¡¯elimination and smoothing speed. And last, the situation of the lake test was introduced, and the performances and application conditions of the algorithms were analyzed based on the experimentation condition.
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