From the Magazine

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

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

April 1, 2015By
Pullen-Galileo-O

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. read more

The System: Celebrating 20 Years of GPS

March 31, 2015By
GPSIIF-launch-ULA-8

April marks the 20th anniversary of GPS FOC. U.S. Air Force Space Command declared Full Operational Capability (FOC) for the GPS constellation April 27, 1995, signifying the system met all requirements with 24 operational Block II/IIA satellites in their assigned orbital slots and providing both the military Precise Positioning Service (PPS) performance standard and the civil Standard Positioning Service (SPS)... read more

Expert Advice: Taking Up Positions — Galileo and E112

March 31, 2015By
Andy-Proctor-T

Europe is looking at the imposition of Galileo as part of an A-GNSS technology push for E112 emergency calling applications. E112 processes currently do not specify performance criteria for the position location accuracy. read more

Out in Front: The Things We Carry

March 31, 2015By
Alan Cameron, editor-in-chief

We have entered a discussion phase at the magazine, a fierce conversation if you will, occasioned on the one hand by the periodic need to freshen our appearance, but also to re-investigate and re-evaluate our whole approach. The way we do things, and the actual things we do. The thoughts and pre-conceptions and mental equipment we carry with us to... read more

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The Business — April 2015

March 30, 2015By

The Business section from the March 2015 issue. Download the PDF. Includes: Mobile World Congress Report; Rohde & Schwarz Adds Testing; FAA Seeks Comments on UAS; and more read more

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GSA’s 2015 Report Dives Deep into Global GNSS Market

March 27, 2015By
FIGURE 2. SUPPORTED CONSTELLATION BY RECEIVERS Chart shows the percentage of available
receivers capable of tracking signals from one GNSS (such as GPS only), two GNSS (GPS
+ Galileo, GPS + GLONASS, GPS + BeiDou), three GNSS (GPS + Galileo + GLONASS, GPS +
Galileo + BeiDou, GPS + GLONASS + BeiDou) or tracking signals from all constellations at
the same time. The percentages add up to 100 percent. We can conclude that almost 60
percent of all available receivers, chipsets and modules are supporting a minimum of two
constellations, showing that multi-constellation is becoming a standard feature across all
market segments.

2015 GNSS Market Report: European GNSS Agency Provides a Fresh Look at Worldwide Growth The fourth edition of the European GNSS Agency’s (GSA’s) GNSS Market Report provides a comprehensive source of knowledge on this dynamic global market. The report has become a key reference for organizations building their GNSS market strategies. The new edition provides: Comprehensive updates on previous analyses;... read more

Antenna Array and Receiver Testing with a Multi-RF Output GNSS Simulator

March 6, 2015By
Luck_opener-O

This article discusses the GALANT adaptively steered antenna array and receiver, demonstrating the test scenarios generated with the GNSS simulator. Exemplary results of different static and dynamic test scenarios are presented, validating the attitude determination capabilities as well as the interference detection and mitigation capabilities. read more