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激光主动成像系统是以激光为光源,对远、小、暗或者恶劣天气条件下的目标进行照明,利用CCD摄相机接收目标的回波信号最终成像,从而实现对目标的跟踪、探测和识别。为了克服主动成像系统的大气后向散射,提高成像质量,利用单片机和CPLD设计了距离选通同步控制板。利用同步控制板可产生精度为1 ns的选通控制脉冲,实现了激光器与摄相机的同步控制,以时间的先后分开不同距离上的后向散射和目标反射回的有用信号。仿真和实验结果证明:该控制板能确保目标的回波信号刚好在摄相机选通工作的时间内到达摄像机并成像。
The laser active imaging system uses laser as the light source to illuminate the target in far, small, dark or bad weather conditions, and finally uses the CCD camera to receive the target echo signal for final imaging so that the target can be traced, detected and identified. In order to overcome the atmospheric backscattering of the active imaging system and improve the imaging quality, a distance gating synchronous control board was designed by using single chip microcomputer and CPLD. Using the sync control board, a gated control pulse of 1 ns accuracy is produced, enabling simultaneous control of the laser and the camera, separating backscatter and target reflections at different distances in time, one after the other. Simulation and experimental results show that the control board can ensure that the target echo signal arrives at the camera and image just within the time of the camera gating.