EPIRB檢測儀的設(shè)計(jì)與實(shí)現(xiàn)
[Abstract]:Medium-sized or above ships need to be equipped with emergency radio beacon (Emergency Position Indicating Radio Beacon,EPIRB) system to ensure the safety of ships and make ships get emergency rescue as soon as possible in distress. EPIRB has been widely used in the field of maritime rescue, and its daily maintenance and working condition detection is the key to ensure normal work. In this paper, by analyzing and studying the design idea of the existing commercial detector, combined with the design index requirements of the EPIRB detector, a new design scheme of the EPIRB detector is put forward, and the functions of high precision measurement and protocol analysis of the carrier frequency of the EPIRB signal are realized. Firstly, the basic principle of EPIRB detector is briefly described, and the design of digital down converter, digital control oscillator and filter used in EPIRB detector is analyzed and simulated. The demodulation principle of dual phase L modulation signal and the principle of BCH decoding are analyzed and simulated. Secondly, according to the design specification of EPIRB detector, the existing carrier frequency measurement methods are analyzed and compared, and the carrier frequency measurement method combining FFT and Costas loop is proposed and implemented. The frequency measurement accuracy and tracking speed of the method are analyzed and verified by Matlab. The simulation results show the effectiveness of the proposed method. Finally, a new design scheme of EPIRB detector is proposed, including RF front-end signal processing module, FPGA digital if processing module and upper computer communication module of EPIRB detector. The experimental results show that each module can achieve the goal and coordinate the work to measure the parameters of EPIRB signal. The technical requirements of the designed EPIRB detector prototype are realized and the design task is completed.
【學(xué)位授予單位】:哈爾濱工程大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN98
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