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Frequently Asked Questions

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Q: What is GNSS?
A: GNSS is the standard generic term for satellite navigation systems that provide autonomous geo-spatial positioning with global coverage. It stands for "Global Navigation Satellite System". As used here it refers to any or all of the GPS, GLONASS, Galileo, Compass or Beidou systems as well as any other system that may be usable for position determination.

Q: What is RTK?
A: RTK or "Real Time Kinematic" is a technique making use of carrier phase measurements of the GNSS signals where a reference station provides correction in real-time, providing up to centimeter-level accuracy. 

Q: How does DataGrid use the large number of channels on its DGRx receivers?
A: DataGrid's DGRx receivers in standard versions come with 336 correlation channels and 4000 search channels. The receiver uses the 4000 search channels to quickly find signals it can use for navigation and passes them on to the precision correlator channels. These start determining phase delays in the received signals. Since the DGRx has many more channels than typical high end GNNS receivers, it can track these signals in multiple parallel channels to detect and often mitigate defects such as cycle slips and multipath.