ION GNSS 2012
Session A3: Geodesy, Surveying & RTK for Civil Applications

Title: Introducing Ambiguity Resolution in Web-hosted Global Multi-GNSS Precise Point Positioning with Trimble RTX-PP
Author(s): K. Doucet, M. Herwig, A. Kipka, P. Kreikenbohm, H. Landau, R. Leandro, M. Moessmer, C. Pagels, Trimble, Germany
Date/Time: Thursday, September 20, 2012, 9:20 a.m.
Room: 103/104 (NCC)

Mid of 2011 Trimble introduced the CenterPoint RTX real-time positioning service providing cm-accurate positions for real-time applications. This service relies on the generation of precise orbit and clock information for GPS and GLONASS satellites in real-time. Recently the support for the first Japanese QZSS satellite was added to the system. While existing PPP systems are available via web access today, the RTX-PP is unique with respect to the support of QZSS signals, the ability to resolve carrier phase ambiguities and the associated convergence performance.
The CenterPoint RTX service is providing real-time precise GNSS positioning for specific markets like Precision Agriculture, Survey, and Machine Control. The delivery of corrections for the receivers in the field occurs either via satellite link, or internet connection.

This paper introduces the new Trimble RTX-PP service, which is running in the cloud and providing absolute position estimates in the well-defined reference frame ITRF2008 using GPS, GLONASS and QZSS observations. The service is available as a web service, as well as through a variety of Trimble office software products.

The achievable accuracy level of RTX-PP can be better than one centimeter in horizontal and two centimeters in vertical with one day of measurement data. Since the convergence time of the solution is well below one hour, the delivered positioning accuracy is at 1-2 cm level within one hour of measurement data or more.

The paper presents the technology behind RTX-PP and the different applications the service is addressing, including:
- The establishment of a precise reference frame with a well-defined datum, especially in areas without sufficient infrastructure; - Monitoring the positions of GNSS reference stations for quality assurance purposes; - Monitoring of subsidence, landslides, etc.

Time series of position estimates will be presented to demonstrate the achievable accuracy in a variety of scenarios, including static and kinematic cases.

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