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LightSquared Would Jam GPS, Defense Officials Tell Congress
September 16, 2011

LightSquared Would Jam GPS, Defense Officials Tell Congress

Air Force Space Commander Gen. William Shelton at House Armed Services subcommittee hearing

Amidst a storm of political controversy and the conspicuous absence of a key administration witness, Department of Defense (DoD) officials told members of Congress today (September 15, 2011) that a proposed broadband wireless service would degrade or render useless billions of dollars of equipment essential to military operations.

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By Inside GNSS
Locata Passes USAF CDR, Technology Adopted by Leica, Launches at ION GNSS 2011
September 14, 2011

Locata Passes USAF CDR, Technology Adopted by Leica, Launches at ION GNSS 2011

Leica’s Jigsaw Positioning System with LocataLite

Locata Corporation and the U.S. Air Force have announced that the Australia-based company has successfully completed the critical Design Review (CDR) contract phase for a Locata network that will enable the U.S. Air Force to deploy a new ground-based, centimeter-accurate "truth-reference level" positioning system for use in GPS-denied environments.

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By Inside GNSS
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First Galileo IOV Satellite Reaches Kourou
September 9, 2011

First Galileo IOV Satellite Reaches Kourou

The Galileo In-Orbit Validation (IOV) ProtoFlight Model (PFM) and Flight Models (FM-2, FM-3 and FM-4) undergoing assembly and testing at Thales Alenia Space’s facility in Rome during May 2011. ESA – S. Corvaja

The first Galileo navigation satellite arrived Wednesday (September 7, 2011) in Europe’s Spaceport in French Guiana, ready to begin preparations for launch on 20 October.

Packed within its protective, air-conditioned container, the satellite — known as Known as Flight Model 2, or FM2 — landed at Cayenne Rochambeau Airport aboard an Antonov aircraft, having departed from Thales Alenia Space Italy’s Rome facility, where it was built.

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By Inside GNSS
The Differences in Differencing

The Differences in Differencing

Equation 1

Q: How does measurement differencing affect my computed position?

A: The short answer is, “That depends.”

Standalone, or undifferenced, measurements obviously produce the poorest positioning performance. However, how we proceed from this most basic data processing approach may affect the computed solution. In this article, we look at the details of why this occurs.

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By Inside GNSS
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Everywhere Navigation

Everywhere Navigation

Consumer demand for positioning information is currently being met by a plethora of wireless positioning technologies. The most popular consumer positioning technology, GNSS, is only one option along with several methods that use cellular networks to provide location, such as wireless local area networks (WLANs), wireless personal area networks (WPANs), radio frequency identification (RFID) tags, and ultrawideband (UWB) communications.

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By Inside GNSS
Breaking the Ice

Breaking the Ice

FIGURE 1: Current availability in the Arctic with VAL=35 m and HAL=40m.

The Arctic houses an estimated 90 billion barrels of undiscovered, technically recoverable oil and 44 billion barrels of natural gas liquids according to the U.S. Geological Survey. These potential energy reserves represent 13 percent of the untapped oil in the world.

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By Inside GNSS
GPS III

GPS III

FIGURE 1: GPS III On Orbit

In May 2008, Lockheed Martin Space Systems Company received a contract from the U.S. Air Force to develop a new, third generation of GPS satellites. The GPS III space vehicle (SV) has been designed (Figure 1, see inset photo, above right) and is now being built to bring new future capabilities to both military and civil positioning, navigation, and timing (PNT) users throughout the globe.

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By Inside GNSS
United Nations International Meeting on The Applications of GNSS

United Nations International Meeting on The Applications of GNSS

ICG Program Officer Sharafat Gadimova

[Updated Sept 7, 2011] The United Nations and the United States will co-sponsor a special meeting to commemorate 10 years of achievement on the global navigation satellite systems on December 12-16, 2011 at the United Nations office Vienna International Center in Vienna, Austria.

The main discussion will center around the International Committee on GNSS (ICG),  created by The UN Office of Outer Space Affairs (OOSA) in 2005 to bring together all system providers and smooth the way for global development of the satellite navigation systems. 

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By Inside GNSS
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