Expert Advice & Leadership Talks

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

Directions 2014: Keeping Our Commitment to Civil Users

December 1, 2013By
Colonel William T. “Bill” Cooley.

The cliché “time flies when you’re having fun” accurately describes how quickly the past six months have passed for me. In a program as challenging, rewarding, and mission-critical as GPS, it is full-speed ahead all the time. As the GPS director, I am acutely aware of the importance of time — particularly high-accuracy time. Since declaring initial operational capability in December 1993, the extremely precise time service delivered by GPS has enabled numerous technological advances around the globe. read more

Expert Advice: Laser Reflectors to Ride on Board GPS III

September 1, 2013By
Figure 2. Structure and products of the Global Geodetic Observing System related to GPS performance.

By James J. Miller and John LaBrecque, NASA Headquarters, and A.J. Oria, Overlook Systems Technologies, Inc. Satellite laser ranging (SLR) and the results of combining SLR with GPS in the future will translate into significant performance advancements for generations to come, once it is fully implemented as part of the GPS III architecture. Simply put, SLR techniques will improve GPS... read more

Expert Advice: Looking Back to the Early Days of GPS

September 1, 2013By

By Len Jacobson Besides my family and friends, two major influences have guided my life. One is GPS, and the other is flying, although I’m not a pilot. Most of the flying was on business trips for GPS. I’ve been writing a book about my experiences and how I helped in a small way to bring GPS to the world.... read more

Expert Advice: The Chip-Scale Combinatorial Atomic Navigator

August 1, 2013By
Figure 1. C-SCAN conceptual implementation.

By Andrei Shkel, Defense Advanced Research Projects Agency (DARPA) Future breakthroughs in microtechnology for positioning, navigation, and timing (PNT) will likely rely on yet-to-be-exploited physics, new materials, highly specialized fabrication technologies, batch assembly techniques, selective wafer-level trimming and polishing, a combination of passive and active calibration techniques strategically implemented right on-chip, and introduction of innovative test technologies. Such microtechnology advances... read more