Abstract
The focusing of a mapping camera affects its principal point,which will change the inner orientation elements and affect the mapping accuracy. Therefore,this paper analyzes in detail the effects of three usual focusing methods( lens focusing,plane mirror focusing,focal plane focusing) on the principal point position of aerospace mapping camera. First,the principles of three usual focusing methods were introduced briefly,and the effects of these focusing methods on the principal points were studied under an ideal condition. Then,through considering the assembly error,the mathematical model between the principal point offset and the focusing distance was built,and the focal plane focusing was proved to be the best focusing method through the example computation in which the positional error of principal point was less than 0. 2 pixel. Finally,by taking the focusing mechanism designed for some cameras as the experiment object,the principal point changes of plane mirror focusing and focal plane focusing were measured. The results show that the computing formula proposed is accurate,and the analysis about the principal point based on different focusing methods is right.The results can be used for choosing the focusing mode of the mapping camera and can meet the needs of high precision mapping.
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