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 acquisition, pointing and tracking (APT) system of optical communications, the resolution of detector is very important for whole system. In order to meet the specification of the communications, improve the performance of APT ulteriorly, a new method is put forward in this paper, it is multiple-sampling for detecting data. According to this method, two results of sampling are added together and disposed by procedure, this can make resolution of charge coupled device (CCD) attain sub-pixel. From the simulation of this method, the resolutions of CCD get to 1/2, 1/4 pixel or more. At the same time, this method can also improve the signal-noise-ratio (SNR) of data. So, the method has been proved to be effective to improve the resolution to sub-pixel for CCD in APT system.