Algorithm of Navigation Fixing Error and Optimum Radio Launch Pads Design Based on GDOP

Proves in theory that GDOP decreases as the number of radio launch pads increases by optimum estimation principle and matrix,points out that a generally used conception of GDOP coefficient and the algorithm used to select the optimum positioning of radio launch pads derived from the method of mathematic analysis on the navigation fixing error,and concludes from the analysis made by the given radio launch pads based on GDOP that the algorithm makes it uniform and simple to analyze the navigation fixing error.