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By observing the same GPS receiver, getting positioning data of 1000 sets of GPS and DGPS each, the two groups of data were calculated by utilizing the probability and statistics, and the average position of the two was GPS: 38°52′. 111N, 121°33′.029E, DGPS:38°52′.107N, 121°33′.033E, 95% of mean square error circle radius of GPS respectively 6.975015372m, DGPS:3.267239581m. By comparison, the positioning accuracy of DGPS is more than twice that of GPS.

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