TAG: algorithms and methods

FIGURE 9. Network used for the triple-frequency PPP study.

Innovation: Carrier-Phase Ambiguity Resolution

April 3, 2015

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.


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Mihaela-Simona Circiu, Michael Felux, German Aerospace Center (DLR), and Sam Pullen, Stanford University

Galileo E1, E5a Performance for Multi-Frequency, Multi-Constellation GBAS

April 1, 2015

Analysis of new Galileo signals at an GBAS compares noise and multipath in their performance to GPS L1 and L5. Even after smoothing, Galileo signals perform somewhat better than GPS and are less sensitive to the smoothing time constant.


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By Zoltan Koppanyi, Charles K. Toth and Dorota A. Grejner-Brzezinska

Innovation: Where Are We?

March 5, 2015

Positioning in Challenging Environments Using Ultra-Wideband Sensor Networks

The use of large transmission bandwidths offers a number of benefits, including accurate ranging and that application in particular is being actively developed for positioning and navigation in environments that are challenging to GNSS such as indoors and built-up areas. In this month’s column, we take a look at the work being carried out in this area by a team of researchers at The Ohio State University.


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By Jingbin Liu, Ruizhi Chen, Yuwei Chen, Jian Tang, and Juha Hyyppä

Innovation: A Bright Idea

November 4, 2014

Testing the Feasibility of Positioning Using Ambient Light By Jingbin Liu, Ruizhi Chen, Yuwei Chen, Jian Tang, and […]


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Innovation: How Deep Is That White Stuff?

September 1, 2014

Using GPS Multipath for Snow-Depth Estimation
In this month’s column, we look at a technique that uses interference fringes generated by signals arriving at an antenna directly from GPS satellites and those reflected by snow surrounding the antenna to measure its depth and how it varies over time. GPS for measuring snow depth; who would have thought?


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Canadian Science Minister Announces Grant to Langley’s UNB Lab

August 26, 2014

The Canadian Minister of State for science and technology, Ed Holder, visited the University of New Brunswick on […]


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FIGURE 2. The network of the four stations used in the evaluation procedures.

Innovation: Ionospheric Modeling Using GPS

February 1, 2014

Greater Fidelity Using a 3D Approach

In this month’s column we look at the performance of a 3D approach to modeling the ionosphere, including times when the ionosphere is particularly interesting (read disturbed).


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FIGURE 1. A cycle slip affecting phase measurements but not the pseudoranges.

Innovation: Cycle Slips

January 1, 2014

Detection and Correction Using Inertial Aiding

A team of university researchers has developed a technique combining GPS receivers with an inexpensive inertial measuring unit to detect and repair cycle slips with the potential to operate in real time.


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