Improving attitude determination accuracy via compensating stand-alone position error;

The paper derives the differential calculation formulas of the errors of geodetic coordinate, Gauss plane rectangular coordinate, transformation parameters and the coordinate of transformed GPS point caused by the datum point positioning error of the unconstrained adjustment of spatial GPS network, and gives an example to verify the correctness of these formulas.

Meanwhile, it also gives the formula of displacement error and point error of any directions in forward intersection, lateral intersection, three point intersection and sides intersectional point.

“Spindle-shape” model about point position error in line element;

Utilizing the error ellipse, the paper analyzes the general regularity of the point position error variation of linear-angular resection.