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Extending goGPS for Snapshot Positioning
Abstract and Figures
In order to estimate the coordinates of a GNSS device, navigation satellites transmit a precise reference clock and their orbit parameters. However, if the received signal is very weak or too short, traditional positioning algorithms cannot be applied. A technique known as Coarse Time Navigation or Snapshot Positioning addresses this problem by providing coarse time and ephemeris by means other than satellite transmission. The goGPS library is an open source library in MATLAB and Java for precise positioning by various stand-alone and relative techniques. This paper presents how Coarse Time Navigation can be added to goGPS. Problems that are unique to this technique will be discussed, as well as some solutions.
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