Research And Realization Of Underwater Secure Detonation System Based On Acoustic Remote Control Technology

Ignition and detonation is the most sensitive and important part of the underwater weapon systems. It is directly related to the reliability of weapons systems, and advanced security and other important indicators. In a large extent, it ultimately decides the combat effectiveness of weapons systems, and it is important in the engineering-oriented application and in the research of efficient and rapid response, low-cost and accurate attack on enemy targets.Along with the development of marine exploitation and the need of national defense construct, Underwater Acoustic Remote Control System (UARCS), especially the Long-Distance UARCS (LDUARCS) has received much attention recently. Underwater Acoustic Channel is one of the worst channels in propagation characteristics. With the distance of remote control increasing, the acoustic channel that transmits the control information becomes much more complex. Signal attenuation of long-distance transmission and multi-path interference caused by the multi-path propagation become main factors for affecting the performance of UARCS.The main task of the principle research on underwater secure detonation technology is to study on detonating underwater blasting equipment without using electrical wire. The objective is to use the modern sonar technology to replace the current electric detonator method which detonates with long cable. This will avoid the numerous difficulties and inconvenience caused by signal transmission using long cable, and provide another choice for developing a new type of underwater detonating equipment. Firstly, the thesis has reviewed the development of underwater acoustic communication, and analyzed the characteristics of underwater acoustic channels. Based on the characteristic of UARCS, the thesis uses the MFSK coding technology for reference and chooses four frequencies to transfer information in LDUARCS, which is in order to increase the ability of anti-jamming of the system by using the characteristics of the MFSK. Secondly, the method to choose the best transmit frequencies and the simulation result of the FFT decoding method are discussed in the thesis. It mainly studies on the hardware design and software design of the coding transmitter, which is based on the direct digital synthesizer AD9832, and the decoding receiver which is based on the DSP chip TMS320VC5409. Finally, the thesis describes the process of the experiment of the LDUARCS. The sampled data with low signal to noise ratio is disposed and analyzed, and the result shows that the proposed method, that is to use four frequencies to transfer information in LDUARCS, has a good anti-noise and anti-jamming capability. It can effectively solve the problem of detonating underwater blasting equipment without using electrical wire.