TAG: precise point positioning

Innovation: Clarifying the ambiguities

March 8, 2016By
FIGURE 1. Public providers of PPP-AR products.

Examining the interoperability of precise point positioning products
Our authors look at the interoperability of PPP ambiguity resolution products distributed by several research organizations for improving position solutions. read more

Innovation: Guidance for road and track

January 14, 2016By
FIGURE 2. SF-PPP solution displayed on a 5-centimeter accurate road infrastructure map, on Dec. 18, 2014.

Real-time single-frequency precise point positioning for cars and trains
In this month’s Innovation column, we bring together, perhaps for the first time, single-frequency and real-time PPP. Our authors describe a series of experiments they have conducted on roadways and a railway achieving sub-meter horizontal positioning at a 95 percent confidence interval. Such accuracies may already be sufficient for freeway lane and railway track guidance. But we might expect even better accuracies in the future. After all, PPP is getting better all the time. read more

PPP for hydrography

December 15, 2015By
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A new high-accuracy technique using one dual-frequency GNSS receiver, precise point positioning (PPP) offers the possibility of cost-effectively obtaining coordinates. This study investigates the accuracy of kinematic PPP for hydrographic applications on rivers, and shows results comparable to double-difference solutions. read more

UNB GAPS for Precise Point Positioning Gets Update

September 9, 2015By

The next version of the UNB GPS Analysis and Positioning Software (GAPS), version 5.9.1, is now available. The new version of the precise point positioning software includes several updates and new features, including creation of GAPS Basic and Advanced user submission pages. The GAPS Basic user submission page allows for quick and easy submission of observation files for users who frequently use... read more

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A Scintillating Project

August 1, 2015By
Setting up the receiver antenna for the offshore trial on board the Geograph vessel.

Countering Ionospheric Disturbances Affecting GNSS in Brazil By Marcio Aquino After 27 months of intense research, the CALIBRA project ended successfully in February 2015, with the project team devising solutions to tackle the effects of perturbations typical of the Brazilian ionosphere on high-accuracy GNSS positioning. CALIBRA was funded by the European Union and the European GNSS Agency. Kicked off in 2012, CALIBRA first confirmed the vulnerability of... read more

Innovation: Carrier-Phase Ambiguity Resolution

April 3, 2015By
FIGURE 9. Network used for the triple-frequency PPP study.

Handling the Biases for Improved Triple-Frequency PPP Convergence
Precise point positioning (PPP) can be considered a viable tool in the kitbag of GPS positioning techniques. One precision aspect of PPP is its use of carrier-phase measurements rather than just pseudoranges. But there is a catch. Often many epochs of measurements are needed for a position solution to converge to a sufficiently high accuracy. In this month’s column, we look at how using measurements from three satellite frequencies rather than just two can help. read more

PPP Solution from NovAtel Improved for Sub-Decimeter Accuracy

March 11, 2015By

NovAtel has announced significant performance improvements to its precise point positioning (PPP) solution. NovAtel CORRECT with PPP will now offer the new TerraStar-C correction service as its exclusive source for satellite-delivered PPP correction data. TerraStar-C contains an enhanced correction data set that enables up to 4-centimeter accuracy and instant re-convergence when combined with the receiver error models and positioning algorithms offered... read more

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Veripos Offshore PPP Services Improve Accuracy

March 11, 2015By

Veripos, a supplier of high-precision GNSS positioning facilities to offshore and associated industries, has upgraded its Apex and Apex² precise point positioning (PPP) services. The services now typically provide users with a horizontal position accuracy of better than 5 cm and 12 cm in the vertical at the two sigma (95 percent) confidence level. The enhanced levels of performance, now available to... read more