高精度激光近炸引信阈值电路设计与应用  

Design and application of high-precision threshold circuit for laser proximity fuze

作　　者：姚萍萍[1] 涂碧海[1] 王相京[1] 张毅[1,2] 赵平建[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,安徽合肥230031 [2]中国科学院合肥智能机械研究所,安徽合肥230031

出　　处：《红外与激光工程》2014年第4期1156-1161,共6页Infrared and Laser Engineering

基　　金：中国科学院合肥物质科学研究院院长基金

摘　　要：设计了一种适合激光近炸引信的小体积新型高精度时刻鉴别电路,采用偏置开关补偿技术来抵消因电荷积累造成的过零点漂移，即依据激光回波幅度来决定偏置电压大小。分析了改进的恒比定时方法的时刻鉴别误差，并进行了详细测试，实验结果表明：信噪比大于20时，输入信号为0.2～2.134 V，既在20.12 dB动态范围内，由输入信号幅度变化和噪声变化引起的时刻鉴别误差小于125 ps，信噪比大于60时，误差小于100 ps。最后将该时刻鉴别电路应用于整机系统中进行实际检测，激光重复频率20 kHz条件下，20 m的作用距离范围内单次定距标准偏差为1.45 cm，极大提高了激光近炸引信的定距精度。A newly compact high-precision timing discrimination circuit based on constant fraction discrimination was designed, which was adapted extraordinarily to laser proximity fuze. A biased switch compensation technology was adopted to counteract the crossing zero walk error caused by charge accumulative action, which meant that the biased voltage was decided by the laser echo amplitude. The timing discrimination error of the improved constant fraction discrimination was analyzed with lots of detailed experiments, The experiment results indicated that the timing discrimination error caused by the amplitude variation and the noise variation of the received signal was less than 125 ps, when the SNR was more than 20 and the input signal is 0.2 V to 2.134 V （20.12 dB dynamic range）. The error was less than 100 ps when the SNR more than 60. Furthermore, Detection on the whole system integrating the timing discrimination circuit verifies that, the laser repetition frequency can reach 20 kHz, the single shot standard deviation is about 1.45 cm over 20 m ranges, which improve greatly the fixed distance precision of laser proximity fuze.

关 键 词：光电子学 激光近炸引信 时刻鉴别 恒比定时 

分 类 号：TN958.98[电子电信—信号与信息处理]