Radio Aided Satellite Navigation Technique
Radio Aided Satellite Navigation Technique ( RASANT ) is a process that transmits DGPS correction data via the radio data system (RDS) of VHF radio in Germany and other European countries.
development
The RASANT method was developed in the nineties at the Land Survey Office in Bonn .
Construction, operation and end of operation
Numerous unmanned GPS reference stations permanently operated in Germany continuously determine the current GPS correction data. These are processed by the respective land surveying authorities and distributed via the RDS service of the public VHF radio of the ARD . Between 1999 and 2009 this service was available nationwide. At the end of 2008 Bavaria ( BR ), Hesse ( HR ) and Bremen ( RB ), since 2009 Hamburg, Mecklenburg-Western Pomerania, Lower Saxony and Schleswig-Holstein (all NDR ), as well as Saxony, Saxony-Anhalt and Thuringia (all MDR ) have the RDS -Correction data broadcast discontinued. North Rhine-Westphalia ( WDR ) ended the broadcast RASANT on July 1, 2010. In Rhineland-Palatinate at the beginning of 2011, a little earlier in Baden-Württemberg, the RASANT broadcast via Südwestrundfunk (SWR) was also ended.
equipment
A differential GPS receiver and a special RASANT decoder are required to evaluate the RASANT data .
advantages
The GPS accuracy is increased on the user side by RASANT to up to one meter. In addition, RASANT is a compression of the data format RTCM 2.0, which leads to very lean and fast data transmission in broadcasting.
alternative
With the additional use of GLONASS in addition to GPS as well as new flexible transmission options, the RASANT offer, which is limited to GPS, has hardly been used since mid-2007. The transmission of correction data via the Internet and the ever increasing availability of mobile Internet applications via GPRS / UMTS meant that the accuracy class previously served by RASANT was increasingly covered by the Ntrip method . In this case, data compression is no longer necessary, as RASANT still contained, but the original RTCM format is used.
Individual evidence
- ↑ "Result report of the expert group GPS reference stations (2004) in the spatial reference working group of the working group of the surveying administrations of the federal states of the Federal Republic of Germany (AdV)" in the joint project satellite positioning service of the German land survey, p. 17 ff., [1] , accessed on March 28, 2019 .