面向非合作目标的大动态范围激光测距系统

Large dynamic range laser ranging system for non-cooperative target

在对空间的非合作目标进行脉冲激光测距时,由于目标的距离跨度范围很大,回波信号的动态范围很大,采用单一的光学或电路调整方法都不能实现全范围的接收。针对不同的距离段,在发射端采用偏振合束器使脉冲光纤激光器和脉冲全固态激光器的光束同轴输出,并对激光的发射功率进行分档,在接收端对雪崩光电二极管的放大倍数进行分档,并引入窄脉冲峰值检测器和可变增益放大器,在自动闭环控制下使接收电路的输出稳定,实现了等效输入动态范围为160 d B、测量范围为15 m^20 km的激光测距系统。

When pulse laser ranging for a non-cooperative target in space, due to the large distance span of the target, the corresponding echo signal dynamic range is also great. Single method of optical or electronic adjustment can′ t meet the requirements of whole range receiving. According to the different distance range, in the transmitter the output beam of pulsed fiber laser and pulsed solid state laser was coaxial by polarization beam combiner and the laser emission power was classified. In the receiver the magnification of avalanche photodiode was also classified. Introducing a narrow-pulse peak detector and a variable gain amplifier, the output of the receiving circuit was stabilized by closed-loop automatic control.The equivalent input dynamic range of 160 d B and measuring range of 15 m-20 km was realized in a pulse laser ranging system.