Algorithms & Methods

Innovation: How Deep Is That White Stuff?

September 1, 2014By
FIGURE 6. Aerial view of the forested site (RN86) around the GPS antenna (marked with a circle).

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? read more

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Canadian Science Minister Announces Grant to Langley’s UNB Lab

August 26, 2014By
Professor Langley (center) discusses the UNB geodesy program with Canadian Science Minister Ed Holder (second from left.)

The Canadian Minister of State for science and technology, Ed Holder, visited the University of New Brunswick on July 28 to announce the awarding by the Natural Sciences and Engineering Council of $2.4 million to 28 UNB researchers. He was joined by Keith Ashfield, member of Parliament for Fredericton, where UNB is based, and Craig Leonard, the New Brunswick Minister... read more

Innovation: Ionospheric Modeling Using GPS

February 1, 2014By
FIGURE 2. The network of the four stations used in the evaluation procedures.

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). read more

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Innovation: Cycle Slips

January 1, 2014By
FIGURE 1. A cycle slip affecting phase measurements but not the pseudoranges.

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. read more

Innovation: Hunting for GNSS Echoes

November 1, 2013By
Figure 1. ARTEMISA simulation platform architecture.

Analysis of Signal Tracking Techniques for Multipath Mitigation
Researchers involved with ARTEMISA describe their efforts to generate synthetic multipath of GPS L1 and Galileo E1 signals and to test different signal tracking techniques in a simulated receiver to see which techniques best minimize the effects of multipath on positioning solutions. read more

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Registration Opens for Munich Satellite Navigation Summit 2014

September 12, 2013By
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Registration is now open for Munich Satellite Navigation Summit 2014, which will be held March 25-27, 2014, at the Residenz Muenchen in Munich, Germany. The summit will have a booth (Booth H) in the exhibit hall at the ION GNSS+ conference next week in Nashville, Tennessee. The conference is offering a special ION rate for those who register no later... read more

Innovation: Under Cover

September 1, 2013By
FIGURE 1. Artist’s impression of the synthetic-aperture GNSS system for surveying in a forest.

Synthetic-Aperture GNSS Signal Processing
We take a look at a novel GNSS signal-processing technique, which uses the principles of SAR to improve code and carrier-phase observations in degraded environments such as under forest canopy. The technique can simultaneously reject multipath signals while maximizing the direct line-of-sight signal power from a satellite. Along with a specially programmed software receiver, it uses either a single conventional antenna mounted, say, on a pedestrian’s backpack for GIS applications or a special rotating antenna for high-accuracy surveying. Want to learn more? Read on. read more

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GNSS PPP Workshop Early Registration Extended to May 3

April 25, 2013By

The International Association of Geodesy, Natural Resources Canada, the International GNSS Service, and York University will be hosting GNSS Precise Point Positioning: Reaching Full Potential in Ottawa, Canada, June 12-14, 2013. The primary objective of this workshop is to provide a forum for international experts from academia, government and industry to discuss PPP-related matters, including data processing, error modelling, data... read more

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