论文部分内容阅读
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。
Due to the influence of temperature and device aging, the phase of the focal plane CCD signal of the space telemetry camera will change. Especially in high-speed applications, the sampling point parameters determined and cured by the traditional method are no longer applicable, which greatly affects the image Signal to noise ratio, and even cause the image can not be displayed properly. A method for adaptive adjustment of the sampling position of focal plane CCD signal in space camera is proposed. By adjusting the phase of CCD signal in real time, the corresponding adjustment of sampling position is calculated and the phase of the sampling clock is adjusted online so that the CCD signal sampling position In its service life of different temperature environments can maintain the best condition, so as to ensure the stability of the image signal to noise ratio. Experiments show that this method can measure the phase change of CCD signal 100 ps in real time and adjust the sampling position in real time. Even if the working temperature changes a wide range, the best condition of CCD signal sampling position can be effectively guaranteed.