Global Navigation Satellite Systems Engineering, Policy, and Design
These days getting the United States, Russia, China, and Europe to agree on a common policy seems to be an increasingly rare event.
That’s why the long-standing comity among system operators in the GNSS sphere is particularly notable and welcome. “Interoperable and compatible” is the first principle espoused by the four nations under the aegis of the International Committee on GNSS.
By Dee Ann Divis
A decade has passed since the first GNSS system-level authentication protocols were proposed, and yet the current ongoing discussion is still, “Do we really need GNSS signal authentication?” Indeed, the current argument is whether we need authentication at the system level (the satellite broadcast service) or whether user-based authentication (anti-spoofing) is sufficient for a number of application requirements.
By Inside GNSS
No reality show contestant ever neared the finish line without the producers serving up another challenge. And so it is for would-be multi-GNSS users in the United States.
After dodging budget cuts, thwarting other teams’ attempts to grab critical frequencies, and dealing with jamming and technical problems, members of the U.S. GNSS community were thrown another curve late last year when they learned that signals from GLONASS and other international constellations must be authorized for use in the United States.
By Dee Ann Divis
It is well known that carrier phase ambiguities are integer values. Intuitively, this is hard to understand with a common counter-argument progressing along these lines: even if the receiver measures the instantaneous phase of the incoming signal (thus removing any fractional cycle component at the receiver end), the phase of the signal at the satellite cannot be guaranteed to be zero, so how can the ambiguity be integer?
In this article we explain why the carrier phase ambiguities are indeed integer.
By Inside GNSS
Figure 1; Tables 1 & 2After some years of concept studies and simulations, the Galileo Commercial Service is taking off. The journey has started toward what can be the most accurate and secure worldwide satellite-based navigation services for civil use.
By Inside GNSS
Running San Francisco Marathon, with daughter, Tanera. Note GPS watch.SIDEBAR: Frank van Diggelen’s Compass Points
“It all traces back to my parents,” says Frank van Diggelen. “My father, Tromp van Diggelen, was a surfer. He taught me to surf and swim, in that order, when I was five. I was racing sailboats before I was 10, and there’s a lot of navigation there. Even when you’re just on a lake, the racing is all about reading the wind, understanding angles of convergence, velocity-made-good, and so on.”
By Inside GNSS
College Hall at Cranwell, Lincolnshire, EnglandTerry Moore will speak about "What Next for GNSS" at the Royal Institute of Navigation Anderson Memorial Lecture at Whittle Hall, RAF Cranwell, Sleaford, Lincs, U.K. on March 2, 2015.
By Inside GNSS
The Waldspirale in DarmstadtThe 2015 CERGAL conference will be held in Darmstadt, Germany on July 7 and 8, 2015.
Qualification and certification of mission and safety critical applications are major milestones in the successful operational rollout of Satellite Navigation systems like GPS/EGNOS, Galileo, GLONASS and Beidou. This symposium will concentrate on measures already established and future activities that will assure SATNAV systems certification and operational safety.
This year’s main topics include:
By Inside GNSS
Rathaus (City Hall) in ViennaThe 2015 European Geosciences Union General Assembly and exhibition will take place in the Austria Center Vienna (ACV) in Vienna, Austria, from April 12 – 17, 2015.
The early registration deadline is March 12, 2015. The program will be available after February 25.
Session topics of particular interest to readers of Inside GNSS include:
By Inside GNSS
Atlanta Botanical Garden canopy walkThe 2015 Unmanned Systems conference and trade show sponsored by AUVSI will be held from May 4 – 7 at the Georgia World Congress Center in Atlanta, Georgia, USA.
The call for papers has closed. Registration information will be available in January.
The conference features technical panels and presentations, workshops and poster sessions on the state of the unmanned systems and robotics industry. It covers military, civil and commercial applications for air, ground and maritime vehicles.
By Inside GNSS
A popular stolby for climbing, near the city of Krasnoyarsk, Russia. The United Nations/Russian Federation Workshop on the Applications of Global Navigation Satellite Systems will take place in Krasnoyarsk, Russian Federation, from May 18 – 22, 2015.
The completed application form, together with a presentation abstract, should be submitted online to the Office for Outer Space Affairs no later than Friday, February 27, 2015.
By Inside GNSS
Altes Schloss, Stuttgart, GermanyThe 2015 InterGEO Trade Fair and Conference for Geodesy, Geoinformation and Land Management will take place at Landesmesse Stuttgart GmbH in Stuttgart, Germany from September 15 to 17, 2015.
It attracts 16,000 visitors from 92 countries who work in the surveying, geoinformation, remote sensing and photogrammetry fields. This is the event’s 21st year.
By Inside GNSS
