| The buoy subsystem is one of the most important components of the underwater target measurement system. It shoulders the extremely important function in the underwater target experiment. As the dry end of the system simulation part, the buoy signal pretreatment circuit connects the system wet end and the digital signal processing, plays the important bridge role. This article from project application angle, elaborated front end of the buoy subsystem simulation part, and the signal pretreatment circuit's design concept and concrete realization.The buoy subsystem signal pretreatment circuit mainly is composed of three modules, including the signal adjustment circuit, the power circuit as well as the interface circuit. Thereinto, the signal adjustment circuit, the main body of the signal pretreatment circuit, performs receiving transducer's output signal enlargement, filter and isolation. The power circuit bases battery power supply characteristic, as well as each part of circuit characteristic produces the multi-channel power sources; The interface circuit completes each part signal introduction and transformation.The vector hydrophone may measures the sound pressure and the particle velocity of acoustic field. The target azimuth estimation based on the vector hydrophone's sound pressure and particle velocity. It is the request of target azimuth estimation that the signal adjustment circuit improves its interchannel phase coherence. Analyzes and designs various measure means of circuit interchannel phase coherence can ensure the target azimuth estimation.The whole system has passed through the laboratorial experiment. The results of the laboratorial experiment have primarily shown that the design of the signal pretreatment circuit of the buoy subsystem is reasonable, reliable as well as correct. Nevertheless, it is the lake experiment and sea experiment that will finally decide whether the design of the signal pretreatment as well as that of the buoy subsystem is successful or not.
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