There has been such a shift towards GPS and DGPS in the past five years that many radio positioning systems now sit on shelves gathering dust. However, there may yet be a place for such systems if GPS becomes unreliable due to increased selective availability or if the system becomes too expensive through licensing or otherwise. In some parts of the world radio systems are still used as the prime positioning method, but even these are quickly being superseded by DGPS. The following will give the reader some information on the major systems still in use. Calibration of these systems is covered in a later chapter.


Drift Rate Master Station Syledis Frequency Lane Width Selective Availability 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • R. P. Loweth

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