The Design And Development Of Beam Forming For The Above Water Device Of The Acoustic Release System

The thesis topic from high reliability Acoustic Release System which is one subject of the National High Technology Development Program (863 Program) and mainly used in the field of underwater acoustic communication. Above water device is an important part of Acoustic Release System, which has function of arbitrary waveform transmitted and echo signal received. In view of above water device features has some shortcomings, the papers will improve from three aspects which is signal transmission, echo signal receive and interface of control and display.Part of the original signal transmission can only launch one-way signal. This article will achieve transmitting of two signals on the board which based on TMS320C5509, by controlling the delay of two signals, thereby changing the signal transmission directional. This article completes to direct the underwater device of Acoustic Release System bases on TMS320C6713. When the underwater device of Acoustic Release System did the test of release it generated echo to signal transmitter. In the receiving board, used the signal which transmitted by the underwater device do Frequency Domain Beam-forming in order to finding algorithm direction. This paper first introduced the principle of Adaptive Notch Filter and Frequency Domain Beam-forming algorithm, and simulation results show the feasibility of the two algorithms, finally introduced the two algorithm's realizing in DSP.Finally, completed the control and display function of transmit and receive part on the platform of miniaturization touch-panel. Aiming at launch part is completed launch angle control and showed measurement and testing results. In addition, the display and control software based on the PC platforms showed the received signal, the power spectrum diagram of Conventional Beam-forming and Minimum Variance Distortionless Response (MVDR) Beam-forming. This section, simulation validated MVDR Beam-forming algorithm comparison with Conventional Beam-forming and realized direction-finding on the display and control software.