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Inside GNSS • July/August 2007

More Compass Points: Tracking China’s MEO Satellite on a Hardware Receiver

In 2000 China deployed the Beidou-1 navigation system. Originally this S-band system provided ranging information via geostationary satellites that operate as transponders. This system design required bulky two-way radios, had a limited capacity, and coverage was restricted to East Asia.

Inside GNSS • July/August 2007

GNSS Over China: The Compass MEO Satellite Codes

On April 14, 2007 (local time), China launched the Compass M-1 satellite. This satellite represents the first of a new global navigation satellite system (GNSS) that is planned to have a total of 35 satellites. Unlike prior Chinese navigation satellites, Compass M-1 broadcasts in L-band, using signal structures similar to other GNSS systems and sharing frequencies near to or overlapping those of GPS, Galileo, and GLONASS.

Inside GNSS • July/August 2007

Galileo’s New PPP: Public-Public Partnership?

Having abandoned — for the time being at least — attempts to attract private investment to the creation of Galileo’s infrastructure, European GNSS leaders are working to shape a Plan B that can gain support from the program’s extensive group of stakeholders.

Inside GNSS • May/June 2007

Opening the GATE

Nestled amid the slopes and valleys of southeastern Germany’s precipitous Alps, a novel installation has taken form over the past three years that will allow receiver designers and application developers to have real-world experience with Galileo signals years before Europe’s GNSS becomes operational.

Inside GNSS • May/June 2007

Speaking with Authority: Galileo's Lead Agency in a Changing World

Sometimes things don’t go as planned.

Thinking Aloud • May/June 2007

Don't Look Back

It might have been the segment from Martin Scorsese’s documentary on Bob Dylan, which I saw recently, that made me think of using this title for my comments.

More likely, however, it’s an echo from my long-gone days on the running track where any athlete worth his or her salt knows that when you come to the final stretch of the race, you shouldn’t look behind yourself.

Inside GNSS • May/June 2007

Galileo’s Plan B (and C)

A sea change appears to be taking place in Europe’s Galileo program as its political masters prepare to transform the struggling public-private partnership (PPP) into a more traditional institutional program wholly sponsored by the public sector.

That would move an additional €2.4 to €3 billion onto the public tax burden, but it might also represent the quickest route to completion of the GNSS project backed by the European Union (EU) and the European Space Agency (ESA).

Inside GNSS • Spring 2007

Two for One: Tracking Galileo CBOC Signal with TMBOC

On-going discussions are taking place between U.S. and European Union (EU) experts concerning the future GPSIII L1C and Galileo E1 OS civil signals. An agreement on a common power spectral density (PSD) known as multiplexed binary offset carrier (MBOC) recently emerged as a solid candidate to replace the current baseline: BOC(1,1).

Inside GNSS • Spring 2007

Enhancing the Future of Civil GPS: Overview of the L1C Signal

The Global Positioning System is undergoing continual modernization, providing ongoing improvements for users worldwide. Although various enhancements in system features have been under development since the mid-1990s, modernization first benefited civil users when Selective Availability — a security-motivated technique for “dithering” the open L1 signal to reduce positioning accuracy — was set to zero in May 2000.

Inside GNSS • Spring 2007

Network Assistance: What Will New GNSS Signals Bring to It?

Globally, GNSS markets are experiencing a sharp growth in sales of consumer products and services. Among these is a cluster of applications known collectively as location based services (LBS), a rapidly evolving field of wireless data services that provide users of mobile terminals with information about their surroundings. As a typical example, travellers can receive directional assistance using downloaded digital maps on which graphical symbols indicate points of interest.

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