Abstract
In order to improve the performance of the underwater trash detection system effectively, the gain fuzzy controller is employed to make programmable gain amplifier work in the optimum status, and its gain will be adjusted according to target distance and echo amplitude in time. The target distance and the echo amplitude are input fuzzy variables, and the amplifier gain is output fuzzy variable. After designing membership functions and fuzzy control rules, defuzzification of the output variable is achieved according to the largest membership degree algorithm. FPGA is used to realize gain fuzzy controller with the inference lookup table, and the system experiments are completed. The results show: the functions of the gain fuzzy controller based on FPGA are implemented correctly, and the design is effectively simplified, and the real-time performance is improved by using the fuzzy inference lookup table.
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