在高速机动目标侦察系统的测距系统中, 当背景随机变化时激光测距系统作用距离应达到数十千米, 根据背景噪声自适应调节工作状态从而达到较高灵敏度和信噪比。针对APD探测器的背景噪声和倍增特性, 开展了自适应偏置控制方法研究; 基于“恒虚警率”控制方法, 设计了激光测距接收前端电路, 分别采用TPG和TPB信号控制电路增益和雪崩倍增因子, 在“静态闭环”状态下测试了自适应特性; 在外场试验中测试了实际测距的“动态闭环”状态, 通过搭建的试验装置, 完成了对远距离目标探测的试验。

In a laser range finding system of a high maneuvering target reconnaissance system, when background changes randomly, the operation distance of the system is as far as a few dozens of kilometer. According to background noise, the operation state is adjusted adaptively to achieve higher sensitivity and signal noise ratio (SNR). According to the background noise and multiplication characteristics of the avalanche photo diode (APD) detector, the adaptive bias control method is researched. Based on constant false alarm rate control method, the laser range finding receiving front-end circuit is designed. The circuit gain and avalanche multiplication factors are controlled by time programmable gain (TPG) and time programmable bias (TPB) signals respectively. The adaptive characteristics are tested under static closed loop state. The dynamic closed loop state in field experiment is tested. The experiment of long-distance target detecting is completed through the experimental devices.