摘要
由于门限阈值电压固定,传统脉冲激光引信接收系统的时刻鉴别电路极易产生信号误判而引起虚警或漏警。针对此问题,提出基于自适应阈值的脉冲激光引信回波时刻鉴别方法,并进行电路优化设计。该方法通过将时刻鉴别电路中门限阈值和放大信号进行关联,使得门限阈值电压可以根据信号源中直流分量及噪声的变化而自适应调节,可显著降低时刻鉴别误差。LT spice软件仿真结果表明:随着直流分量的增加,门限阈值增加,该优化电路可根据直流分量的变化而自适应调节;随着信噪比的增大,门限阈值自动降低,该优化电路可根据噪声变化而自适应调节。该优化电路可将比较器输入两端的电压差控制在适当的范围,实现对脉冲结果的控制。该自适应阈值时刻鉴别电路结构简单、易于实现,为实现激光引信的高精度测距提供了有效的支持。
Due to the fixed threshold voltage,the timing discrimination circuit in traditional pulse laser fuze receiving systems is prone to signal misjudgment and can cause false alarms or missed alarms.Therefore,this paper proposed a method for identifying the echo time of pulse laser fuze based on adaptive threshold,and optimized 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 modulate 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 adaptive threshold time discrimination circuit had a simple structure and was easy to implement,providing effective supports for achieving high-precision ranging abilities of laser fuzes.
作者
程碧瑶
张雅茹
李雨蔚
王小卓
付曦瑶
唐辉
CHENG Biyao;ZHANG Yaru;LI Yuwei;WANG Xiaozhuo;FU Xiyao;TANG Hui(No.212 Institute of China Ordnance Industry Corporation,Xi'an 710065,China;Science and Technology on Electromechanical Dynamic Control Laboratory,Xi'an 710065,China;State Key Laboratory on High Power Semiconductor Lasers,Changchun University of Science and Technology,Changchun 130022,China)
出处
《探测与控制学报》
CSCD
北大核心
2024年第4期32-38,57,共8页
Journal of Detection & Control
关键词
激光引信
时刻鉴别电路
自适应阈值
laser fuze
time discrimination circuit
adaptive threshold
