非合作目标微弱激光信号前端处理研究

Research on the Front-end Processing Technology for Faint Laser Signal of Non-cooperative Target

针对干扰环境条件下非合作目标微弱激光信号识别困难,通过对比研究3种激光信号接收电路的性能和缺点,并设计了并联LC选频反馈网络的跨阻电流-电压转换电路,分析了其提取微弱激光信号的原理和性能.实验结果表明:并联LC电流-电压转换电路能够有效地抑制激光回波信号中直流信号和其他环境干扰,放大了目标频段的信号,提高了信号的信噪比,克服了其他接收方式的缺点,增强了激光探测系统识别非合作目标微弱激光信号的能力.

With recognition difficulty of weak laser signal reflecting from non-cooperative target in interfering conditions, by comparing the performance and disadvantages of three laser receiving circuits, the frequency-selective feedback of parallel LC network with transimpedance current - voltage conversion circuit was proposed, and the principle and performance for weak laser signal extraction was analyzed. The experimental results show that： parallel LC Current - voltage converting circuit can effectively suppress laser echo signal of the DC signal and other environmental interference and amplify target signals. It greatly improves the signal to noise ratio, overcome the shortcomings of the other receiving means, and enhance the laser detection system to identify non-cooperative target weak laser signals.