Abstract: The photographic measuring camera is an instrument for precisely measuring the traces of flying targets and flying parameters. In this paper, the necessary of its periodical correction was described. Especially, through use for a long time, the variations of the numerical value of its focal length will be caused by its carry, vibration and temperature variation; it directly affects the measuring accuracy. Based on theoretical analyses and practices, the datum image plane and datum mark coordinates etc were precisely corrected by using general instruments and equipment, such as T4 theodolite and collimators and so on. The net plate measured precisely was installed on its image plane; the focal length and distortion were measured by angulation method. But the real value of the focal length was defined by means of the minimum value of distortion. The accuracy of measured and corrected results was analyzed, and the result proved that the correction was reliable. !2
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