应用空间卷积的方法对CCD 航测相机成像系统的光学成像过程和CCD 积分采样成像过程进行了分析。提出通过改变地面分辨力(GRD)与像元分辨力(GSD)的比值(Kell 系数)来提高图像分辨力的方法。对Kell 系数取不同值时的标靶成像过程进行仿真，提出以比较CCD 上影像一个周期内的平均调制度为评判标准的方法，对CCD 航测相机的成像质量进行评价。结果表明，当Kell 系数取2.8 时，便可以分辨出地面标靶的特征。

The method of spatial convolution has been applied to analyze the imaging process of CCD imaging system, which involves optical imaging process and CCD integral sampling process. The way of changing the ratio between Ground Resolution Distance (GRD) and Ground Sampled Distance (GSD) (Kell coefficient) to improve the image resolution was introduced. Imaging process of the target was simulated with different Kell coefficient values. The method of comparing the mean modulation values in a period of the images on CCD which was regarded as the evaluation criteria was proposed to evaluate the image quality of the CCD aerial surveying camera. The results show that when Kell coefficient equals 2.8, the target characteristics can be distinguished.