Laser Fuze Pulse Echo Time Identifying Method Based on Adaptive Threshold
Due to the fixed threshold voltage,the timing discrimination circuit in traditional pulse laser fuze re-ceiving systems is prone to signal misjudgment and can cause false alarms or missed alarms.Therefore,this pa-per proposed a method for identifying the echo time of pulse laser fuze based on adaptive threshold,and opti-mized the circuit design.This method correlated the threshold voltage in the time discrimination circuit with the amplified signal,so that the threshold voltage could be adaptively adjusted according to the changes in the DC component and noise of the signal,thereby significantly reducing the time discrimination error.The simulation results using LT spice software showed that the threshold increases as the DC component increases,indicating that the optimized circuit could adaptively modulate corresponding to the changes in the DC component.As the SNR increases,the threshold decreased automatically,indicating that the optimized circuit could adaptively mod-ulate corresponding to changes in noise.This optimized circuit could control the voltage difference between the input terminals of the comparator within an appropriate range,achieving control over the pulse results.The a-daptive threshold time discrimination circuit had a simple structure and was easy to implement,providing effec-tive supports for achieving high-precision ranging abilities of laser fuzes.
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