High Precision Real-Time Differential Correction Network for Geodetic Applications

Sven Martin, Cord-Hinrich Jahn

Abstract:	Global Navigation Satellite Systems (GNSS) are commonly used for geodetic and land surveying applications. The standard accuracy that is provided by GNSS is not sufficient for the biggest part of these operations [1]. Therefore differential correction methods are required. According to this the state survey offices of Germany have installed a differential correction service for geodetic applications. Code- and phase-corrections are broadcast in the VHF-band using RTCM V2.1 [2] (Radio Technical Commission For Maritime Service). One major problem is that the accuracy depends on the distance to a reference station (length of baseline) due to orbit and atmospheric effects. To reach a more precise solution, various numbers of reference stations are connected together and form a network. Within this network these influences are computed and a set of “area correction parameters” is also transmitted in RTCM Type 59. Field trials and measurements have confirmed the high accuracy of this service. This paper describes the system itself, investigations on communication methods as well as site and frequency planning. In addition measurements from field trials will be presented to demonstrate the high accuracy in a real-time environment.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	23 - 30
Cite this article:	Martin, Sven, Jahn, Cord-Hinrich, "High Precision Real-Time Differential Correction Network for Geodetic Applications," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 23-30.
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