APIS: Advanced Position Increment Solution for Different GNSS Applications

D. Ivanov, V. Morgoon, G. Zyryanov

Abstract:	There are some GNSS real time Land Survey/GIS applications where final user performance is defined not only by position itself, but by position change during some time interval. Final position (if needed) can be then computed as some initial position plus that position change during some admissible time interval. Error in measuring position change usually grows with time and is mostly driven by ionosphere, troposphere, and Satellite clock divergence. The effective measuring this position change with time can bring noticeable benefit to some field user jobs. One example is RTK performance while long term (minutes) reference data outage caused by data link disconnect. In this case, initial position is latest accurate RTK position, while position change can be measured using uncorrected carrier phase observables. Most RTK systems usually stop reporting RTK position after some short time (tens seconds or less) after data link disconnect. Extending maximum RTK age (up to 10 minutes) by effective position change estimation has obvious practical interest. The other application is some local area GIS jobs. Usually GIS receivers insure (sub) meter real time accuracy which for some professional GIS applications can be insufficient. Currently to achieve dm level GIS one has to use differential (RTK) corrections which require data link. Another way is to transit to Precise Point Positioning (PPP) mode which requires L1/L2 data and L-band corrections. The cost GIS user pays for dm level solution can be too high. At the same time, for some specific local area GIS jobs, accurate position can be achieved by measuring position change during some time interval starting from some known point. This can be done without any cost increase and with L1-only receivers. Given article describes the new Magellan Pro technology APIS, which allows getting accurate and reliable position change solutions during time interval T (cm level accuracy up to about 30 seconds or more, dm level accuracy up to about 10 minutes) without any external correcting data. Additionally we demonstrate the benefit when using so called closed loop technique which allows improving real time position change divergence for some GIS field scenarios.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	2130 - 2137
Cite this article:	Ivanov, D., Morgoon, V., Zyryanov, G., "APIS: Advanced Position Increment Solution for Different GNSS Applications," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2130-2137.
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