GNSS

Navigating the Moon

March 28, 2012By

The European Space Agency has issued an intriguing Intended Invitation To Tender, “Weak GNSS Signal Navigation on the Moon.” The study will investigate use of weak-signal GPS/GNSS — and of course ESA is interested primarily in the use of Galileo — for real-time position, navigation and timing information to various future lunar assets such as automated landers, rovers, Earth-Moon transportation vehicle, in-situ navigation, and so on. read more

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

Galileo Launches Accelerated

March 23, 2012By

Javier Benedicto, the head of the Galileo Project Office for the European Space Agency (ESA), set an aggressive schedule for launching some Galileo satellites as many as four at a time in 2014 and 2015, in an effort to meet a target provision date of Galileo’s initial services in 2014 and full services in 2015. The announcement emerged at the... read more

This article is tagged with and posted in Galileo, GNSS, Latest News

The Kinematic GPS Challenge: First Gravity Comparison Results

March 14, 2012By

By Theresa Diehl The National Geodetic Survey (NGS) has issued a “Kinematic GPS Challenge” to the community in support of NGS’ airborne gravity data collection program, called Gravity for the Redefinition of the American Vertical Datum (GRAV-D). The “Challenge” is meant to provide a unique benchmarking opportunity for the kinematic GPS community by making available two flights of data from... read more

This article is tagged with , and posted in Algorithms & Methods, Opinions, Survey News, Tech Talk

Septentrio, QinetiQ Partnership Delivers Galileo PRS Signal Reception

March 12, 2012By

Another major milestone in the Galileo system’s development and deployment program has been achieved. Septentrio and QinetiQ, working in close partnership with the European Space Agency (ESA) and their industrial partners, achieved the world’s first successful reception of the encrypted Galileo Public Regulated Service (PRS) signal from the first Galileo satellites, launched in November 2011. The signal was received on... read more

This article is tagged with , and posted in Featured Stories, Galileo, GNSS, Latest News

UrsaNav Testing Wide-Area Timing Alternative

March 5, 2012By

As a result of a Cooperative Research and Development Agreement (CRADA) between the U.S. Coast Guard and UrsaNav, Inc., on-air tests are being conducted from the former Loran Support Unit site in New Jersey. One of the CRADA’s goals is to research, evaluate, and document a wireless technical approach as an alternative to GPS for providing precise time. The ability... read more

The System: NTIA, FCC Waiver No More on LS

March 1, 2012By

“We conclude that LightSquared’s proposed mobile broadband network will impact GPS services and that there is no practical way to mitigate the potential interference at this time.” These words from Lawrence Strickling, U.S. assistant secretary for communications and information and head of the National Telecommunications and Information Administration (NTIA), appear to signal the end of LightSquared’s run. Strickling’s letter to... read more

Galileo’s Surveying Potential: E5 Pseudorange Precision

March 1, 2012By
Col-opener

New Galileo signals have great potential for pseudorange-based surveying and mapping in both optimal open-sky conditions and suboptimal under-canopy environments. This article reviews the main features of Galileo’s E5 AltBOC and E1 CBOC signals, describes generation of realistic E5 and E1 pseudoranges with and without multipath sources, and presents anticipated horizontal positioning accuracy results, ranging from 4 centimeters (open-sky) to 14 centimeters (under-canopy) for E5/E1. read more

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Out in Front: The Fire Next Time

March 1, 2012By

We have turned back the LightSquared effort to establish a threatening beachhead adjacent to GPS spectrum bands. Having expended many millions, we can now return to our business, secure in having demonstrated both our rights and our rightness. No. We cannot afford to do that. read more

This article is tagged with and posted in From the Editor, GNSS, GNSS Opinions, Opinions