WT5”BZ]:In the intersection measuring target with line array CCDs,the noncoplanar error caused by that optical axes and pixels lines of two CCDs arent on the same plane,is studied in this paper.

But the phase data of each subaperture include non-common path error,and in order to accomplish the stitching,the CCD pixel coordinate of each subaperture should be unified to the coordinate of the mirror.

On the common mode error of pressure drop fluctuation measuring systems;

How to reduce the common mode errors of the time coordinate series is important for the extraction of crustal deformation.

The results indicate that the common mode errors can be extracted with all three methods and thereby the precision of coordinates will be improved remarkably,but they have respective advantages and disadvantages.