GNSS Opinions

GPS CNAV Debate, and GNSS Interoperability Moves Forward

March 27, 2014By

The most modernized GPS satellites on orbit will broadcast a new civil navigation message (CNAV) on the L2C and L5 signals in April. That's the plan, at least. An update on the CNAV debate in the United States. Also, summaries of key presentations from the international committee charged with inter-GNSS compatibility and interoperability. read more

Europe’s Spring Season for GNSS

February 26, 2014By
EUResidencePermit-W

The hounds of spring are on winter’s traces. As Galileo emerges from its long, cold slumber, the energy of a new constellation radiates through the skies to encourage blossoms across Europe. ESA’s recent declaration of in-orbit validation means the downstream satnav market can now truly get going. If a lot of demand has yet to be demonstrated, certainly a lot... read more

The Gold Standard: What’s in a Name?

February 12, 2014By
Don Jewell

Our esteemed editor-in-chief and publisher at GPS World, Alan Cameron, penned an editorial in January concerning claims made by the People’s Republic of China regarding the Gold Standard for PNT (position, navigation and timing). The Chinese recently claimed that its BeiDou system averaged a user range error (URE) of 2.5 meters using zero age of data (ZAOD), 95% of the... read more

Who Carries the Gold Standard Now?

January 28, 2014By
GNSS_opener

China’s BeiDou system claimed a user range error (URE) of 2.5 meters zero age of data (ZAOD) 95% recently.  The parallel GPS specifications commit to 6 meters 95% ZAOD and 7.8 meters 95% all AODs.  Does this mean that BeiDou is more accurate than GPS? Not so fast. In late December, director Ran Chengqi of China’s Satellite Navigation System Management... read more

This article is tagged with and posted in Featured Stories, GNSS Opinions, Newsletter Editorials

Directions 2014: Great Expectations

December 1, 2013By
Peter Large

By Peter O. Large, Vice President, Trimble November 29, 2013, marks the 210th anniversary of the birth of Christian Doppler. His work laid down the fundamental concepts that enabled researchers at Johns Hopkins University in the United States to make observations on the signals of Sputnik I during the International Geophysical Year of 1957. From those observations more than 60... read more

Directions 2014: Galileo IOV Passes with Flying Colors

December 1, 2013By

Following the second Galileo launch in October 2012, leading to four operational satellites in orbit, a progressive chain of events has taken place in 2013 encompassing all Galileo Services, starting from the first position fix on March 12 (Figure 1), when navigation message continuous broadcast began. read more

Directions 2014: Serve the World, Benefit Mankind — A System Matures

December 1, 2013By
Distribution of visible in-orbit BeiDou satellites.

By adhering to the principles of independence, openness, compatibility, and gradualness, China has steadily pushed forward the deployment of the BeiDou Navigation Satellite System (BDS), following a planned three-step strategy. In 2000, BeiDou Navigation Satellite Demonstration System was completed. By December 2012, five geostationary orbit (GEO) satellites, five inclined geosynchronous orbit (IGSO) satellites, and four medium-Earth orbit (MEO) satellites had been launched, forming the constellation, and formally beginning service provision to the Asia-Pacific region. read more

Directions 2014: New Horizons of GLONASS

December 1, 2013By

The fundamentals of Russian government policy in satellite navigation are defined in Presidential Decree #638 of May 17, 2007, and specify that GLONASS services are provided globally and free of any user fees, and GLONASS is used as a basis of the National Positioning, Navigation and Timing System. To efficiently implement the government policy in satellite navigation, in March 2012 the Government approved the dedicated Federal Program focused on GLONASS sustainment, development, and expansion of applications. read more