提高外场重频激光光斑测量距离的研究

摘要

To evaluate laser pointer ’s localization accuracy of moving objects, a laser spot measurement system is typically used to measure the spot of a 1.064 μm-wave-length laser on the tar-get.However,the maximum measuring distance of existing laser spot measurement systems is only 500 m,which needs to be substantially increased.This essay analyzes the constraints of laser spot dis-tance measurement,studies the methods for increasing the measuring distance of repetitive-frequency laser spot in field,designs a shutter optimal control strategy based on the use of a high-quantum-effi-ciency near-infrared camera which is able to precisely control the shutter exposure.A 99.9% laser spot admission rate is guaranteed,meanwhile the laser spot image SNR is increased about 8 times by con-trolling the camera exposure time.In field,the measuring distance of frequency-repetitive laser spot reaches 2 000 m,which meets the precision requirements for moving target measurement.%为评定激光指示器对运动目标的指示精度,通常使用激光光斑测量系统,测量照射在靶标上波长为1．064μm 的激光光斑位置。而现用激光光斑测量系统的最大探测距离仅为500 m,需要大幅提高。本文通过分析制约激光光斑测量距离的因素,研究了提高外场重频激光光斑测量距离的技术途径,在选用可精确控制快门曝光的近红外高量子效率摄像机的基础上,设计了快门最优控制策略。在保证激光光斑录取率99．9％的同时,通过控制摄像机曝光时间,将激光光斑图像信噪比提高了约2倍多。外场测量时,对重频激光光斑的测量距离达到了2000 m,满足了对运动目标测量的精度要求。