| 摘要 |
A method of accurate determination of a fixed position using global positioning system uses pseudo-range output over a predetermined measurement period from a stand-alone GPS receiver located at the fixed position, the pseudo-range output being measured from an ensemble of space vehicles at eac h time t over the measurement period, and historical ephemerides of the ensemb le of space vehicles over the same measurement period to eliminate errors cause d by selective availability. The historical ephemerides of the ensemble of spa ce vehicles corresponding to each measurement time t are determined, and using the pseudo-range output and the historical ephemerides, a position solution at each time t is computered. The accurate position in earth-centered earth-fix ed coordinates is then the average of all the position solutions at each time t over the measurement period. |
