Filling in the gaps of RTK with Regional PPP

Guillermo Tobias, Cristina Garcia, Alvaro Mozo, Pedro Navarro, Ricardo Piriz, Irma Rodriguez, Daniel Rodriguez

Abstract:	A growing number of GNSS users are demanding highly-accurate positioning services with minimal latency and maximal availability. Within the existing techniques which allow real time positioning, Real Time Kinematic (RTK) and Precise Point Positioning (PPP) may be the most widely spread ones. Although both positioning techniques use dual-frequency pseudorange and carrier-phase measurements, PPP differs from RTK in that no observation data from reference stations, with precise known coordinates, are needed in the proximity of the user receiver. The only observation data that must be processed are measurements from the user receiver. It also removes the need of having simultaneous observations on both target receiver and base station receiver. Although the PPP concept is commonly understood as a global technique, it is possible to develop a regional PPP service by using a relatively sparse regional network of base stations to compute the reference orbit and clock products. This new approach is a very attractive complement to the existing RTK networks, as it allows providing precise positioning services far away from the existing base stations without the need for deploying additional sites. One example would be a relatively large region (> 500 km wide) with RTK coverage on two or three distant areas. This paper presents in more detail the concept of regional PPP, and addresses the performances achievable in regions of different sizes. The required density of reference stations is analyzed, and the performances are evaluated versus PPP with global products and versus RTK.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2193 - 2201
Cite this article:	Tobias, Guillermo, Garcia, Cristina, Mozo, Alvaro, Navarro, Pedro, Piriz, Ricardo, Rodriguez, Irma, Rodriguez, Daniel, "Filling in the gaps of RTK with Regional PPP," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2193-2201.
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