A: System Categories

GPS/ GNSS Community Feels New Telecom Interference Threat from LightSquared

GPS/ GNSS Community Feels New Telecom Interference Threat from LightSquared

In his State of the Union address on January 25, President Obama held up the Global Positioning System as a prime example of government providing “cutting-edge scientists and inventors with the support that they need” to create world-leading, job-creating innovation.

The following day, the Federal Communications Commission (FCC) International Bureau approved a conditional waiver allowing LightSquared Subsidiary LLC to build tens of thousands of terrestrial transmitters for wireless communications in frequencies on either side of the GPS L1 band.

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By Inside GNSS
Lockheed Martin to Test GPS III in Virtual World
January 25, 2011

Lockheed Martin to Test GPS III in Virtual World

Collaborative Human Immersive Laboratory (CHIL) illustration (Lockheed Martin)

GPS III contractor Lockheed Martin has integrated several virtual reality technologies in a new Collaborative Human Immersive Laboratory (CHIL) in Littleton, Colorado, which will be used to validate and test next-generation GPS and other space programs.

With CHIL, Engineers and technicians can explore satellite designs and functions, troubleshoot and fine-tune them in a virtual world before building them in physical space.

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By Inside GNSS
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Three GPS Satellites Moved Into New Positions for More Robust, Accurate Signals

Three GPS Satellites Moved Into New Positions for More Robust, Accurate Signals

(Update June 15, 2011 Inside GNSS) Completion of Satellite Repositioing Optimizes GPS Constellation

By next June, the United States GPS constellation will attain the most optimal geometry in its nearly 33-year history. Over time, that means a more robust signal, more accuracy and more reliability in GPS-challenged environments.

The 50th Space Wing is in the middle of maneuvering six GPS satellites into more favorable positions. The two-phase operation, called "Expandable-24"  is halfway to completion.

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By Inside GNSS
GLONASS: Bumpy Road
January 24, 2011

GLONASS: Bumpy Road

After technical and political setbacks, Russia gets ready to launch its first CDMA-equipped satellite in February.

Russia’s GNSS program started off the year recovering from a series of setbacks that resulted in the dismissal of two space officials in the wake of the December 5 launch failure of three GLONASS-M satellites.

The postponed launch of the next-generation GLONASS-K demonstration spacecraft in 2010 meant that the program ended up the year with four fewer satellites in orbit than expected.

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By Inside GNSS
Galileo Mid-Term Review Foresees €1.9 Billion in Additional Costs
January 18, 2011

Galileo Mid-Term Review Foresees €1.9 Billion in Additional Costs

Antonio Tajani, EC Vice-President. EC photo

A European Commission (EC) communication sent to the European Parliament and European Council today (January 18, 2011) estimates that completing a fully operational capability (FOC), 30-satellite Galileo system and the European Geostationary Navigation Overlay Service (EGNOS) will cost an additional €1.9 billion above the €3.4 billion already allocated.

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By Inside GNSS
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2011 Space Weather Workshop
January 17, 2011

2011 Space Weather Workshop

Forecasters at NOAA’s Space Weather Prediction Center (NOAA photo)

The annual Space Weather Workshop will take place on April 26-29 2011 in Boulder, Colorado.

Program organizers call it the "meeting of science, research, applications, operations and users." The program highlights space weather impacts in several areas, including
communications, navigation, spacecraft operations, aviation, and
electric power. 

Recent progress in large-scale modeling efforts will
be featured; while new developments in Sun-to-Earth coupled modeling systems
will also be a highlight.

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By Inside GNSS
Dorides to Head European GNSS Agency [updated]

Dorides to Head European GNSS Agency [updated]

[updated January 18, 2011] Carlo des Dorides has been named as the new executive director of the European GNSS Agency (formerly the Galileo Supervisory Authority or GSA).

He will succeed Heike Wieland, who leaves at the end of January to become principal legal council at the European Patent Office. Wieland served as GSA acting director following the departure of Pedro Pedreira last June.

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By Inside GNSS
Gianni-500px.jpg
January 9, 2011

A Model-Based Approach

For the complete story, including figures, graphs, and images, please download the PDF of the article, above.

Galileo receiver designers require formal interface specifications for the Galileo signal-in-space (SIS) in order to write unambiguous and accurate specifications for Galileo receivers. To compute their positions, Galileo receivers must be able to retrieve timing and orbital information from the data stream conveyed in Galileo analog signals.

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By Inside GNSS
Indian Regional Navigation Satellite System

Indian Regional Navigation Satellite System

FIGURES 1, 2 & 3

For the complete story, including figures, graphs, and images, please download the PDF of the article, above.

In satellite navigation, a GNSS receiver must account for several sources of error such as relativistic effects, atmospheric propagation delay, offset of satellite clocks from system time and satellite ephemeris. In order to accurately compute user position, velocity, and time (PVT), these errors need to be predicted/estimated precisely.

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By Inside GNSS
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