CCD信号自适应采样方法的研究和实现

发布时间：2018-03-10 01:40

  本文选题：自适应采样　切入点：电荷耦合器件　出处：《红外与激光工程》2016年05期 　论文类型：期刊论文

【摘要】：由于受温度变化和器件老化影响,空间遥感相机焦平面CCD信号的相位会发生变化,尤其是在高速应用领域,利用传统方法定标确定并固化的采样点参数不再适用,极大影响了图像信噪比,甚至造成图像不能正常显示。提出了一种针对空间相机焦平面CCD信号采样位置的自适应调整方法,通过实时监测CCD信号的相位变化,计算相应的采样位置调整量,并在线调整了采样时钟的相位,使CCD信号采样位置在其使用寿命期限中不同的温度环境下均能保持最佳状态,从而保证图像信噪比的稳定。实验表明:利用该方法,可以实时测定CCD信号100 ps的相位变化,并实时完成采样位置的调整,即使工作温度大范围变化,CCD信号采样位置的最佳状态也可得到有效保证。
[Abstract]:Due to the influence of temperature change and device aging, the phase of focal plane CCD signal of space remote sensing camera will change, especially in the field of high speed application, the parameters of sampling point determined and solidified by traditional method are no longer applicable. The signal-to-noise ratio (SNR) of the image is greatly affected, and even the image can not be displayed normally. An adaptive adjusting method for the sampling position of the CCD signal in the focal plane of the space camera is proposed. The phase change of the CCD signal is monitored in real time. The corresponding sampling position adjustment quantity is calculated, and the phase of the sampling clock is adjusted online, so that the sampling position of CCD signal can be kept in the best condition under different temperature environment during its service life. The experimental results show that the phase change of 100ps of CCD signal can be measured in real time, and the sampling position can be adjusted in real time. The optimal state of sampling position of CCD signal can be effectively guaranteed even if the working temperature varies over a wide range.
【作者单位】： 北京空间机电研究所;
【基金】：国防预研项目
【分类号】：V445.8;TN911.7
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本文编号：1591233