New RTCM SC-104 Standard for Differential GNSS

Rudolph M. Kalafus

Abstract:	This paper describes the revisions recently made in the RTCM SC-104 standard on differential 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 PE-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:	Proceedings of the 52nd Annual Meeting of The Institute of Navigation (1996) June 19 - 21, 1996 Royal Sonesta Hotel Cambridge, MA
Pages:	175 - 181
Cite this article:	Kalafus, Rudolph M., "New RTCM SC-104 Standard for Differential GNSS," Proceedings of the 52nd Annual Meeting of The Institute of Navigation (1996), Cambridge, MA, June 1996, pp. 175-181.
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