Experimental Verification of Internet-Based Global Differential GPS

M.O. Kechine, C.C.J.M. Tiberius, H. van der Marel

Abstract:	Internet-based Global Differential GPS (IGDG), introduced by NASA's JPL, is claimed to offer an accuracy of 10 cm horizontal and 20 cm vertical, in realtime, anywhere on Earth, at any time. An independent experimental verification has been carried out, by means of both a static and a kinematic test in the Netherlands. In the static test, the means of the position coordinates, taken over 24 hours time spans, do agree with the known reference at the 1-2 cm level. The IGDG position solutions appear to be really free of systematic biases. The standard deviations of individual real-time position solutions turn out indeed to be 10 cm for the horizontal components and 20 cm for the vertical component. The position coordinate estimators are correlated over about a 1 hour time span. In the kinematic test, carried out with a small boat, the means of the coordinate differences with an accurate ground-truth trajectory, over the almost 3 hour period, are at the 1-2 dm level; the standard deviations of individual positions were similar to values found in the static test, 10 cm for the horizontal components, and 20 cm for the vertical component. More than 99% of the IGDGcorrections were received with the nominal interval of 1 second, in the field via mobile communication using a GPRS cellular phone. The latency of the corrections was generally 7 to 8 seconds. Keywords: global DGPS, kinematic positioning, real-time dm-accuracy
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	28 - 37
Cite this article:	Kechine, M.O., Tiberius, C.C.J.M., Marel, H. van der, "Experimental Verification of Internet-Based Global Differential GPS," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 28-37.
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