水声引信的新型近程超声波探测系统电路设计

ccording to the principle and characteristic of the acoustic detection system for fuze, the system circuit was divided into emitting circuit, signal processing circuit and control circuit, and designed. Considering that only 2-6 pulses were contained in a 1ms duration Doppler shift signal and the inert distortion of the traditional diode envelope detector's output was serious, a count detector was designed by using CPLD. The detector counted the pulse number of input signal, and distinguished between disturbing signal and echo. It has detector and filter functions, therefore the anti-interference ability is enhanced. The simulations of the count detector and CPLD control circuit were completed by using the Xilinx foundation series 3.1 software. At last, the work performance of the circuit of the acoustic detection system for fuze was checked by the underwater static experiment.