The Validity of a Method for Improvement of DGPS Position Accuracy

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  • DGPS測位において位置精度を向上させる一手法の有効性

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Abstract

For the accuracy of DGPS positions obtained in the service area of a certain DGPS station, the twice of standard deviation of position errors is approximately 4 - 5m and that is accurate enough for common navigation of ships. However, if more accurate positions are required, a set of RTK-GPS equipment or a set of high accurate DGPS equipment must be used. In this study, the validity of a simple and easy technique (hereinafter referred to as D-DGPS) to improve the DGPS positions was investigated using two DGPS receivers, which can receive the medium wave beacon transmitted from the DGPS stations, at two points. The results are summarized as follows : (1) The DGPS position error distribution was reduced to about one-half by the D-DGPS technique. (2) The correlation coefficients were approximately more than 0.8 between the two points. (3) When the difference of the reception delays of the pseudo range correction data is less than 10 seconds between the two points, the difference has no great influence on the accuracy of D-DGPS positions. (4) The allocation of the GPS satellites affects on the position accuracy by DGPS and by D-DGPS.

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