The series control with the velocity loop and the position loop is an effective design method in the electro-optical tracking system which requires short respond time and little tracking error.
在光电实时跟踪系统中要求响应的时间短、跟踪误差小，采用速度环和位置环的串级控制是一种有效的设计方法。
Centroid algorithm is a high accuracy method to locate the point on CCD image. But the large amount of data makes it respond slowly and unsuitable for the real-time digital photogrammetrical system.
重心法是一种高精度的CCD像点位置提取算法，但由于数据量大，响应速度较慢，不适于要求实时响应的数字摄影测量系统。
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