CAJ | 학술논문

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.
침대이왕모의맥충격광인신탐측계통존재적측거오차교대적결점,위진일보제고맥충격광인신적측거정도,설계료일충수자화맥충격광인신탐측계통.해탐측계통포괄발사、접수화신호처리3부분,기중신호처리부분주요실현맥충회파신호적고속실시채양여완존、신조비증강여시연고계.채용쌍통도ADC병행채양,실현료이200 MHz적등효채양빈솔대맥충회파신호진행고속채양.당맥충회파신호흔미약시,채용다맥충상간평균산법제고료기신조비,증강료대미약회파신호적검측능력.통과최소이승시연고계산법득도료회파시연,진이계산득도목표거리.측거실험결과표명:해탐측계통측거정도교고,최대측거오차위0.25 m.
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.