数字化脉冲激光引信探测系统设计与信号处理

针对以往模拟脉冲激光引信探测系统存在的测距误差较大的缺点,为进一步提高脉冲激光引信的测距精度,设计了一种数字化脉冲激光引信探测系统.该探测系统包括发射、接收和信号处理3部分,其中信号处理部分主要实现脉冲回波信号的高速实时采样与缓存、信噪比增强与时延估计.采用双通道ADC并行采样,实现了以200 MHz的等效采样频率对脉冲回波信号进行高速采样.当脉冲回波信号很微弱时,采用多脉冲相干平均算法提高了其信噪比,增强了对微弱回波信号的检测能力.通过最小二乘时延估计算法得到了回波时延,进而计算得到目标距离.测距实验结果表明:该探测系统测距精度较高,最大测距误差为0.25 m.

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.