Global Navigation Satellite Systems Engineering, Policy, and Design
GPS Block IIF Satellite (Boeing photo)Last week’s launch of the first GPS Block IIF illustrates the changes that have occurred not only with the pioneering U.S. GNSS program but also with the nation’s aerospace industry since the Global Positioning System initiative was launched 36 years ago.
By Inside GNSS
Binghao Li is a research associate in the School of Surveying and Spatial Information Systems, The University of New South Wales, Sydney, Australia.
Li obtained the B.Sc. in electrical & mechanical engineering from Northern Jiaotong University, P.R. China and the M.Sc. in civil engineering from Tsinghua University, P.R. China.
He received his Ph.D. from the University of New South Wales, Sydney, Australia. His research areas include pedestrian navigation, new positioning technologies, and network-RTK.
By Inside GNSS
Stas Sila-Novitsky (left) and Javad Ashjaee. Photo by Marc Cheves, American SurveyorVery sad news from Moscow. Earlier this month, Stanislav Sila-Novitsky — Stas to his friends and colleagues — died unexpectedly after a short illness.
A member of the executive staff of Javad GNSS, Sila-Novitsky had a long career in space electronics engineering. During the Soviet era, he was the department head with the Russian Space Agency’s Institute of Space Device Engineering, which was responsible for the development of the overall GLONASS system electronics.
By Inside GNSS
British Prime Minister Gordon Brown visits the Geospatial Building at the University of Nottingham. Photo courtesy of GRACE(This article first appeared in the March 31 Inside GNSS SIGNALS eNewsletter)
Driven in part by a prestigious Space Innovation and Growth Strategy (Space IGS) report suggesting that the nation has lost both the best industrial work and the ability to influence programs such as Galileo, the United Kingdom will establish a new national space agency on April 1.
By Inside GNSS
The theme of the 2010 International Symposium on GPS/GNSS is "At a Turning Point." It will take place at Howard International House in Taipei, Taiwan on October 26-28.
National Cheng Kung University is organizing and hosting the event. The symposium will be held in English.
The annual forum is open to innovative ideas on GNSS systems, techniques, applications and opportunities by researchers and engineers from academia and industry.
By Inside GNSS
A common assumption in real-time kinematic (RTK) techniques is that the differential ionospheric delay between a GNSS transmitter and each of the roving or reference receivers is negligible. However, increased position uncertainty — spatial decorrelation — is usually allocated to the baseline receivers as baseline distances increase.
A refinement of this assumption comes with the network RTK (NRTK) using a set of permanent receivers to mitigate atmospheric dependent effects, such as the ionospheric delay, over distance.
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AsteRx3 Receiver from SeptentrioSeptentrio has launched the AsteRx3, a compact multi-frequency GPS/GLONASS/Galileo and Compass/Beidou-ready receiver.
AsteRx3 is specially designed for integration in demanding precision positioning, navigation, and automation applications such as land and maritime survey, machine control, and unmanned aerial vehicle (UAV) payloads.
By Inside GNSS
The European Commission (EC) has announced the award of three of the six contracts for the procurement of Galileo’s initial operational capability (IOC), including a €566-million (US$811.2-million) award to OHB System AG for a first order of 14 satellites.
By Inside GNSS
The 24th international congress of the International Federation of Surveyors will take place at the Sydney Convention and Exhibition Centre in Sydney, Australia.
The FIG 2010 keynote speech will be given Monday morning, April 12 by Tim Flannery,
2007 Australian of the Year. He will speak
about climate change, drawing on his book, The Weather Makers: How Man Is Changing
the Climate and What It Means for Life on Earth, which debuted on
The New York Times bestseller list.
A frequently asked question about GPS is: How accurate is a GPS-based position? The experienced GPS user knows that a big difference lies between using pseudoranges alone or combining pseudoranges and carrier phases.
The following analysis is partly based on an idea raised in the book, Global Positioning System: Signals, Measurements, and Performance, by P. Misra and Per Enge (See Additional Resources section at the end of this article).
By Alan Cameron
Trimble will hold its first user conference in China on December 15-17 at the Jiuhua Resort and Conference Center in Beijing. It will cover civilian technology only.
The theme "Exploration Has No Boundaries," draws comparisons between 15th century navigator Zhenghe, the 2008 space mission Shenqui, and the use of positioning technology to steer exploration.
Trimble head Steve Bergland will deliver one of the conference keynotes.
By Inside GNSS
Trimble and the China Railway Eryuan Engineering Group Co. Ltd. (CREEC), the third largest civil construction enterprise in the world, have signed a definitive agreement to form a 50/50 joint venture in China.
By Inside GNSS
XF102Hemisphere GPS has launched its XF102 DGPS receiver, the latest addition to the company’s XF-Series of differential GPS receivers for handheld mapping.
By Inside GNSS
