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在空间光通信跟踪、瞄准和捕获(APT)系统中,探测终端的位置分辨率对整个通信系统的性能起着巨大的影响,为了使终端探测器的分辨率达到系统的要求,进一步提高跟踪、瞄准和捕获系统的性能,提出了一种新的提高探测器CCD分辨率的方法,即多次采样处理。通过将两次采样的数据进行叠加处理,然后利用软件进行控制,可使CCD的位置分辨率提高到亚像素的精度。模拟结果表明,利用该多次采样处理可以将CCD的位置分辨率提高到1/2像素,1/4像素或更高的精度。同时该方法还可以抵消诸如散粒噪声、暗电流噪流起伏等噪声,从而使信噪比得到提高。
In the space optical communication tracking, aiming and capturing (APT) system, the position resolution of the probe terminal has great influence on the performance of the whole communication system. In order to make the resolution of the terminal detector reach the requirement of the system and further improve the tracking, Aiming at and capturing the performance of the system, a new method to improve the resolution of detector CCD is proposed, that is, multiple sampling processing. By superimposing twice-sampled data and then controlling it with software, the CCD’s position resolution can be increased to sub-pixel accuracy. Simulation results show that the use of the multi-sample processing CCD position resolution can be increased to 1/2 pixel, 1/4 pixels or more accuracy. At the same time, this method can also offset such as shot noise, dark current noise fluctuations and other noise, so that the signal to noise ratio is improved.