激光主动成像系统信噪比模型的研究

Signal-to-noise ratio model of laser active imaging system

根据主动成像系统的成像过程,通过分析目标与背景的辐射特性、大气的后向散射特性、距离选通特性以及激光发射器和接收器的性能,建立了激光主动成像系统的信噪比模型。利用工作波长为0.532μm的固体激光器I、CCD相机以及基于CPLD技术设计的距离选通同步控制板,进行了距离选通激光主动成像实验。实验结果表明:理论模型与实际图像的信噪比平均误差为2.58 dB,证实了该模型的合理性。

According to the imaging process of laser active imaging system, the signal-noise ratio model of laser active imaging system is established by analyzing the reflection characters of target and background, atmosphere backscattering character, range gating character and the performance of laser and receiver. By using a 0. 532 μm solid laser , an ICCD camera and a range gated sync control plate based on CPLD technology, the laser active imaging experiment is done. The experimental results indicate that the average error of SNR between theoretical model and real image is 2.58 dB,which shows the SNR model is reasonable.