I agree with that! RTCM is not a signal format. It is the Radio Technical Commission for Maritime Services which set standards for communication and navigation equipment. RTCM SC-104 is the standard for the transmission of ground based differential GPS signals.
Getting a little off topic here. I stated in my first post that RTCM was a format, I am no expert, but that info was taken from the user manual for the Fugro Seatex Diff Signal Demodulators we use.
These demodulators receive GPS
differential corrections through both the Inmarsat satellite
network, and the Spot Beam sat network. These demodulators can be set up to receive the diff signal in either RTCM or raw format. Up to a few years ago, Fugro also transmitted corrections in SCF (it was not SCM my earlier mistake), SCF was Super Compressed Format.
I also found this quoted on one site
"The format of the correction information varies. There are now two public formats, the RTCM-104 and the WAAS. The RTCM or Radio
, is a standards organization. The format was generated by its special committee number 104. The WAAS was designed by a similar industry/government organization, the RTCA. In addition many manufactures of high end equipment
have a proprietary format. The manufacturers formats are often aimed at the more precise DGPS method called Kinematics."
Quite a few other sites refer to RTCM format
Admitedly, the equipment I'm refering to here is commercial
use only, our GPS can utilise corrections signal via satellite
(with corrections from up to 10 shore stations being used), also using the SBAS system, and IALA, (which is corrections via radio signal) In addition, the equipment uses what is revered to as XP and HP corrections. The GPS computer can measure phase diferences of the raw GPS satellite signal, and the quoted accuracy is 15mm horizontally, and 10mm vertically.
If I have caused confusion by stating that RTCM is a format, I apologise, I was only passing on information gleaned over a few years of using DGPS, and what I have read in various manuals
and reference books
, and what was passed on to me at various courses I have attended concerning DGPS and Dynamic Positioning systems