超短基線水聲定位系統(tǒng)應答器設計
[Abstract]:The ultra-short baseline underwater acoustic positioning system uses underwater acoustic communication and underwater acoustic positioning technology to complete the measurement and secondary positioning of submarine seismic exploration cables. It has the advantages of small size of acoustic transducer array, movable positioning, easy placement and installation, etc. Widely used in shallow water oil and gas resources exploration. Acoustic transponder is an underwater response unit of an ultrashort baseline positioning system. It is fixed on the submarine exploration cable and provides measurement data for the positioning system to respond to the positioning signal. In view of the limitation of domestic underwater acoustic positioning system in shallow water oil exploration, such as short positioning distance and unable to locate multi-target, a MSP430 single chip microcomputer is designed and implemented. Digital signal processor is a new type of underwater acoustic transponder for coprocessor. The hardware of the system is designed in many aspects, such as device selection, duty circuit selection, power amplifier efficiency, power management and so on, which can reduce the power consumption of the transponder underwater standby. The weak signal pickup of low SNR under water is analyzed in detail and processed at board level, which enhances the anti-jamming ability of transponder, and uses 16-bit high performance, low power consumption C5000 series digital signal processor as coprocessor for underwater acoustic spread spectrum communication. The communication mode of transponder is Gold code direct sequence spread spectrum, which improves the underwater anti-multipath and anti-attenuation ability. At the same time, the orthogonal spread spectrum coding enables the positioning system to solve multiple response signals simultaneously. The function of multi-target positioning is realized. Through the MATLAB simulation, the practical test of the anechoic tank and lake shows that the transponder is stable and reliable. The standby static working current is less than 5 Ma, which realizes the simultaneous response and positioning of the large elevation multi-target transponder with the action distance of 1500m and 30 meters dive depth, and achieves the expected design target.
【學位授予單位】:北京化工大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:TP368.1;TN912.3
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