RTCM

The Radio Technical Commission for Maritime Services ( RTCM ) is an American organization that create in 1947 with the aim of foundations and standardization of maritime telecommunications, was founded.

SC -104

Admits became the RTCM especially for the standing associated with GPS standard for transmitting corrections for GNSS applications. It contains data elements, time intervals between transmissions, data segment sizes, units and resolution of the parameter to be transferred, the format of which is defined in different data types. It was developed by the Special Committee No. 104 (SC- 104) and first presented in 1985 as a recommendation.

Development

The first definition of a standard was created for so-called DGPS applications. In the original specification of the GPS only a navigational accuracy of 100 meters was intended for civilian applications. For this purpose, the so-called Selective Availability ( Selective Availability, S / A) was developed in the 1990s. Essentially, it involves an artificial degradation of the achievable measurement accuracy by cyclic satellite clock errors, which were not disclosed by the system and therefore could not be corrected directly.

From the field of geodesy since the 1980s, differential measurement methods were known. In the differential method using GPS starts from identical or similar errors at two measuring stations. Since the artificial degradation of the satellite signal from all stations is measured as the same size, can be eliminated by forming the difference of observations between two stations on the same satellite that mistake again.

SC -104 has been extended to the standard for various applications. In addition to DGPS corrections there are also different methods for so-called real-time kinematic applications ( RTK). While achieved with DGPS in about meter accuracy, RTK deliver applications up to centimeter accuracy.

Name of standardization for the data protocol for transmission of correction data:

  • RTCM SC -104 Version 1.0 (1985 )
  • RTCM SC -104 Version 2.0 ( 1990)
  • RTCM SC -104 Version 2.1 (1994 )
  • RTCM SC -104 Version 2.2 (1998)
  • RTCM SC -104 Version 2.3 (2001)
  • RTCM SC -104 Version 3.0 (2004)
  • RTCM SC -104 Version 3.1 (2009)
  • RTCM SC -104 Version 3.2 (2013 )
Real Time Kinematic
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