EW RTCM SC-104 STANDARD FOR DIFFERENTIAL GNSS

Rudolph M. Kalafus

Peer Reviewed

Abstract:	This paper describes the revisions recently made to the Radio Technical Commission for Maritime Services Special Committee-104 (RTCM SC-104) standard on differential Global Navigation Satellite System (GNSS) broadcasts. A major contribution of the new RTCM standard is to introduce several new messages that support differential GLONASS operations. Specifically, new GLONASS messages are provided: (1) differential corrections, (2) reference station coordinates, (3) satellite constellation health data, (4) radiobeacon almanac, (5) null message, and (6) ASCII text that accommodates languages other than English. Other messages are defined as well. An important new message indicates the datum employed by the reference station, if it uses a datum other than WGS-84 (GPS) or PZ-90 (GLONASS). A second new message provides time, so that users logging data can identify the day of the week and determine UTC time. Another provides the GPS/GLONASS offset, in order to support combined GPS/GLONASS operation. A fourth new message supports higher precision in the reference station antenna phase center location. In addition to the new messages, new material is included that provides additional guidance to users of differential GNSS services. The major issues are discussed in this paper.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 43, Number 4
Pages:	363 - 374
Cite this article:	Kalafus, Rudolph M., "EW RTCM SC-104 STANDARD FOR DIFFERENTIAL GNSS", NAVIGATION: Journal of The Institute of Navigation, Vol. 43, No. 4, Winter 1996-1997, pp. 363-374.
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