GNSS

Galileo Satellites Put to the Test

November 11, 2013By
Galileo_FOC_FM2_main_antenna-O

Europe’s next pair of Galileo satellites have been the focus of a busy autumn at the European Space Agency’s (ESA’s) technical centre in the Netherlands, continuing a full-scale campaign to ensure their readiness for space. With the first four Galileos already in orbit, these new versions are the first two of a total 22 Full Operational Capability (FOC) satellites being... read more

Fourth ESA Colloquium on Galileo Coming in December

November 4, 2013By

The Fourth International Colloquium on Scientific and Fundamental Aspects of the Galileo Programme will be held in Prague, Czech Republic, December 4–6. Since 2007, the worldwide scientific community has met every two years to discuss the possibilities for boosting the scientific use of Galileo and for contributing to the development of the GNSS. The event is always organized in one... read more

This article is tagged with and posted in Galileo, GNSS News

New Structure for GLONASS Nav Message

November 2, 2013By
Glonass-K-W

Russian scientists propose a new code-division multiple-access signal format to be broadcast on a new GLONASS L3 signal. Once implemented across the modernizing GLONASS constellation, this will facilitate interoperability with — and eventually interchangeability among — other GNSS signals. The flexible message format permits relatively easy upgrades in the navigation message, if required. read more

This article is tagged with and posted in From the Magazine, GLONASS

The System: Autumn Falls Back

November 1, 2013By
Delta IV, the current GPS launch vehicle, awaits a date with space at Cape Canaveral.

Launch Delays Ground GPS IIF and Galileo FOC The scheduled October 23 launch of GPS IIF-5, the fifth in the current “follow-on” generation of GPS satellites, has been postponed in order to complete a review of an adjustment made to the rocket’s upper stage engine. A loss of thrust by a Delta IV rocket upper stage during a GPS launch last... 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

This article is tagged with , and posted in Algorithms & Methods, Innovation

The Halloween Storms: When Solar Events Spooked the Skies

October 30, 2013By
ssn_predict_l-O

Ten years ago, scientists watching the skies experienced a Halloween fright of cosmic proportions, when space weather degraded GPS signals, affecting land and ocean surveys, and commercial and military aircraft navigation. The most extreme of what became known as the Halloween Storms hit on October 30, 2003 — ten years ago today. According to the National Oceanic and Atmospheric Agency,... read more

Real-Time GNSS Activities at ESA

October 28, 2013By
The ESA Navigation Office.

The European Space Operations Centre has taken on the roles of real-time analysis center, data provider, and analysis-center coordinator for the International GNSS Service’s Real-Time Service, providing a number of products combining data streams from multiple sources. read more

This article is tagged with and posted in Augmentation & Assistance, Featured Stories, From the Magazine, Galileo

GPS IIF-5 Launch Delayed

October 22, 2013By

The scheduled October 23 launch of GPS IIF-5, the fifth in the current “follow-on” generation of GPS satellites, has been postponed in order to complete a review of an adjustment made to the rocket’s upper stage engine. A fuel leak in that engine of the Delta 4 rocket during a GPS launch in October of last year created some worries... read more