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Study on Information Receiver of Multi-array Organic Mine-Hunting Sonar System

Author: ChangXuCheng
Tutor: LiuSheng
School: Harbin Engineering University
Course: Control Theory and Control Engineering
Keywords: Organic Mine-hunting sonar Ocean ambient noise Echo signals Multiphase filter Channelized receiver
CLC: U666.7
Type: Master's thesis
Year: 2009
Downloads: 43
Quote: 0
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Abstract


With the improvement of technology, the mine has changed into an high-tech equipment from original explosive. Low efficiency, low safety, less flexibility are the disadvantages of existing Mine-hunting system. Multi-array organic Mine-hunting system could effectively solve above-mentioned disadvantages as a new system, and has wide application prospect both in the detection and development of marine and in the military.Multi-array organic Mine-hunting system is a new engineering system with high-tech, involved in the most advanced technology. This paper is combined with project, and it made a further discussion and study on one of the key technology for the system implementation—the information transmission technology between multi-emission array and single receiver, after it has structure out system general structure and each function unit. This lay a theoretical foundation for design the whole system. The major contents of this paper are:1. Combining the disadvantages of existing Mine-hunting system and analyzing the environment and demand of marine, this paper presented a new detection system—Multi-array organic Mine-hunting system. The structure of system is detailed analyzed, and is took a further explain combined whit the system’s working process. At last the advantages of this system are introduced.2. This paper introduces two interferences which have an effect on information transmission technology, ocean ambient noise and reverberation. The source and spectrum of ocean ambient noise are also mentioned. Time series of ocean ambient noise are obtained via matlab simulation using typical ocean ambient noise spectrogram of shallow sea. And then the basic concept and statistical characteristics of reverberation are introduced. The mathematical model of reverberation is established by using unit scattering physical model combined with statistical characteristics. Firstly, the mathematical model of average reverberation level is established. And the attenuation law of reverberation is obtained after inverse calculation, at last the reverberation is simulated in matlab.3. The characteristics of echo signal could be described as transfer function using the value of A_m、τ_m、φ_m ( m = 1,2,3…N) in different azimuth according to highlight physical model. The characteristics of echo signal scattered by cylindrical shell with ball coronary which contains geometric echo and elastic echo is discussed. The echo of typical mine is gained for matlab simulation. After that the highlight structure is also obtained by correlation processing.4. Single channel structure and multi-channel structure of sonar receiver are analyzed and the disadvantages are also mentioned in this paper. The reason why using multi-channel receiver based on multiphase filter is mentioned by introduced the principle and established mathematical model of it. Aiming at the two situations of multi-channel receiver verification and instance simulation are done in matlab. The results of simulation show that synthetic echo signals with difference load frequency can be effective separated by multi-channel receiver. Further more it does not change the highlight structure of echo signals. So the correctness and feasibility of this receiver are verified in this paper.

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CLC: > Transportation > Waterway transport > Marine Engineering > Navigation equipment, acoustic equipment > Acoustic equipment
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