201411 November/December 2014 Archives - Page 2 of 3 - Inside GNSS

201411 November/December 2014

Higher Aspirations for GNSS

GPS Space Service Volume (SSV) Requirements/Performance Parameters

New space missions such as the robotic repair and recovery of damaged or errant communication satellites may become possible with the aid of an emerging class of receivers that is able to use GPS signals for navigation in orbits thousands of kilometers above the middle Earth orbit (MEO) GPS constellation itself.

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By Dee Ann Divis

EU and Russia: Lost in Space?

Space business as usual — ESA Director-General Jean-Jaques Dordain addressing Munich Satellite Navigation Summit 2014 earlier this year.

Russia’s involvement in the Ukraine crisis has turned much of public opinion in the West against that country, in particular souring the relationship between the European Union (EU) and Russia. And, while the ceasefire signed in September technically is still in force, the EU-Russia rift is far from smoothed over.

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By Peter Gutierrez

Multi-GNSS Precise Positioning

Dennis Odijk, Curtin University

The availability of carrier phase tracking — counting the cycles of GNSS signals between satellites and a receiver — has long enabled high-precision users to achieve greater accuracy than using the navigation messages or pseudoranges. Improvements in high-end receivers and techniques such as real-time kinematic (RTK) and precise point positioning (PPP) have made once inconceivably accurate results almost routinely accessible.

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By Inside GNSS
November 14, 2014

First GPS III Launch Slips to FY17

GPS III core structure at Lockheed Martin facility. Lockheed Martin photo

The launch of the first GPS III satellite could slip to as late as March 2017, further delaying a modernization program that already has been pushed back repeatedly by budget cuts and technical problems.

“The first GPS III launch is tentatively considered for the first half of FY17, based on booster availability and Air Force launch priorities,” a spokesman for the Space and Missile Systems Center told Inside GNSS.

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By Inside GNSS
October 29, 2014

8th GPS IIF Satellite Begins Transmitting Nav Signals

[Updated December 15, 2014] The eighth GPS Block IIF navigation satellite launched on October 29 has completed its operational checkout and was set to healthy and usable on Friday (December 12, 2014). This brings the number of satellites transmitting the L2C signal to 15 and those transmitting the L5 signal to 8.  The next GPS-IIF satellite, IIF-9/SVN-70 is tentatively scheduled for launch in March of 2015.

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By Inside GNSS
October 23, 2014

New Home (or Not) for Galileo in European Commission

Daniel Calleja Crespo, Director-General of DG Enterprise. EC photo

The European Parliament voted yesterday (October 22, 2014) to accept President-elect Jean-Claude Juncker’s “last-chance” leadership for the European Commission (EC).

But the 11th-hour reshuffling of posts appears to leave Galileo without a clear-cut leader, at least at the political level — even as the Commission and its European Space Agency (ESA) partner have decided to give up the prospect of a December launch of two satellites.

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By Inside GNSS
October 17, 2014

Army Funds GPS M-Code Upgrades as NATO Tackles Interoperability Problems

Heidi Shyu, assistant secretary of defense for acquisition, logistics and technology

Pushed by Congress to upgrade to M-code, the U.S. Army is earmarking money for the new capability even as sequestration is forcing programs cuts, according to the service’s top acquisition official.

“We are heading towards the M-code capability,” said Heidi Shyu, assistant secretary for acquisition, logistics and technology. The Army has worked “our S&T (science and technology) pieces,” she said, noting that the Air Force was developing the necessary circuit cards through is Military GPS User Equipment (MGUE) program.

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By Inside GNSS
October 16, 2014

ICAO, RTCA Seek New Protections for GNSS Aviation Receivers

GPS pseudolite used in experiment at University of New South Wales Satellite Navigation and Positioning Lab

International aviation officials have asked U.S. experts to consider updating standards for GNSS aviation receivers to improve their ability to withstand interference from repeaters, pseudolites, and jammers.  

Repeaters — generally used to extend navigation signals inside buildings where they would otherwise be blocked — rebroadcast GNSS satellite signals and therefore operate in the same frequency band. Although useful within a building,  care must be taken to confined the repeater’s signal lest it confuse other receivers operating nearby.

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By Inside GNSS