| Summary: | A communication system based on the ocean expendable sound velocity(XSV) was designed and implemented. The 2DPSK signal was used as the transmission signal, and the single double-stranded enameled wire was used as the communication channel. The high voltage bias circuit, amplification filter circuit and software demodulation algorithm of the demodulation circuit are designed. Compared with the traditional communication system, the system does not use the demodulation circuit based on FPGA or other demodulation chip, but fully utilizes the advantage of the core processor STM32F407 to achieve high frequency, complete data demodulation and data upload on the chip. The function simplifies the circuit and facilitates measurement. The demodulated data was analyzed through experiments. The test results show that the design of the communication system is feasible and reliable, and meets the requirements for communication quality in complex marine environments.
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