基于MTF的时间延迟积分CCD成像系统同步误差分析

通过像移调制传递函数MTF分析了TDI CCD行扫速率与运动像不同步时对相机成像质量的影响。为验证速度失配对TDI CCD相机成像质量的影响，针对应用环境，利用高对比度靶标对TDI CCD动态成像进行了仿真实验和动态测试，结果表明，在奈奎斯特频率范围内，只要将相机动态成像系统的同步误差控制在±2%的范围内，并使图像时钟处于连续多相的工作方式，就可以基本上消除同步误差对成像质量的影响。

Analysis of synchronization error for time delayed integration (TDI) CCD imaging system based on MTF

The negative effect of the mismatch between time delayed integration (TDI) CCD line scanning velocity and image motion on image quality is fully analyzed with phase-motion modulated transfer function (MTF). In order to verify the effect of the velocity mismatching on the image quality of 96-stage TDI-CCD camera,based on the application environment,the simulative experiment and dynamic testing for the dynamic imaging of the TDI-CCD camera were conducted by utilizing the target with high contrast characteristic. The results show that within the range of Nyquist frequency,the effect of the synchronization error on the imaging quality can be basically eliminated during the processing of imaging so long as the synchronous error is strictly controlled in the range of 1 2 % and the imaging clock is in the continuous four-phas eoperating mode.