September 12, 2007
Operators of the world’s four GNSS systems and regional augmentation systems have laid the foundation for a multilateral environment in which to discuss issues of compatibility and interoperability.
Inside GNSS • July/August 2007
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
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.
Thinking Aloud • July/August 2007
I opened the PDF with this month’s cover design from our art director, Tim Jordan, about five minutes after I picked up the morning newspaper. In the paper, a front-page article described our local school district’s plans for starting what would eventually become a 12-year immersion program in Mandarin (putonghua or guoyu).
Inside GNSS • May/June 2007
On April 13 2007, the People’s Republic of China launched the first middle earth orbiting (MEO) satellite in its Compass GNSS system, 21,550 kilometers (or about 13,200) miles above the Earth. The spacecraft began transmitting signals on three frequencies within a few days, much more quickly than operational satellites in other GNSSes.
Inside GNSS • Spring 2007
China has taken the next step in developing its Compass GNSS system, launching the nascent system’s first medium Earth orbit (MEO) satellite into space on April 14.
Inside GNSS • March/April 2007
A convergence of developments over the past few months has brought Europe’s Galileo program to the most critical passage of its history — at least, since final approval of the GNSS initiative by the European Space Agency (ESA) and the European Union (EU) in 2003 and 2004, respectively.
Inside GNSS • January/February 2007
The 14-year (and counting) history of Europe’s Galileo program has always made for a complex story line.
And it’s not getting any simpler.
Among the latest complications: the transition of responsibilities from the Galileo Joint Undertaking (GJU) to a new GNSS Supervisory Authority (GSA, also referred to as the Galileo Supervisory Authority), further extension of negotiations over a long-term concession contract to operate Galileo, and growing pressure from commercial companies to allow them to sell Galileo technology that they have developed or want to develop.
Inside GNSS • November/December 2006
China has confirmed what many have been expecting for some time: it will construct the world’s fourth GNSS system — joining the systems operated by the United States, Russia, and Europe.
Inside GNSS • July/August 2006
The consortium negotiating to build and operate Europe’s Galileo system now expects to sign an agreement with the Galileo Joint Undertaking (GJU) by the end of 2006.