Detection system design and signal processing for digital pulsed laser fuze

Due to the large ranging error existing in analog pulsed laser fuze detection system, a kind of digital pulsed laser fuze detection system was designed in order to improve ranging accuracy of the pulsed laser fuze. The digital pulsed laser fuze detection system consisted of transmitter, receiver and pulse signal processor. And the main functions of the pulse signal processor were high speed real-time sampling and storage, signal to noise ratio improvement and time delay estimation. Dual-channel parallel analog to digital converter was adopted to sample the pulse echo signal with 200 MHz equivalent sampling frequency. When pulse echo signal was weak, multi-pulse coherent average algorithm was used to improve the signal to noise ratio of the echo, and the detection ability of weak signal was enhanced. Time delay of the echo was obtained by least square estimation method, and then target range was calculated. The experimental results show that the ranging accuracy of the system is high, and the maximum ranging error is 0.25 m.