GNSS

Innovation: Getting at the Truth

January 1, 2013By
Inn-opener

A Civilian GPS Position Authentication System
When a GPS receiver reports its position to a monitoring center using a radio signal of some kind, how do we know that the receiver or its associated communications unit is telling the truth? It’s not that difficult to generate false position reports and mislead the monitoring center into believing the receiver is located elsewhere — unless an authentication procedure is used. In this month’s column, we look at the development of a clever system that uses the concept of supplicant and authenticator to assess the truthfulness of position reports. read more

This article is tagged with and posted in Algorithms & Methods, From the Magazine, GNSS, Innovation

Galileo and Compass: A Tale of Also-Runnings

December 19, 2012By

Beating up the backstretch neck and neck, tied for third in the GNSS race, Galileo and Compass today offer some signals and some satellites to GNSS users — as long as those users are researchers. Galileo has more going for it in the way of signals, while Compass holds an edge in the number of satellites. Without an interface control... read more

Compass ICD Rumored Again

December 18, 2012By

A GNSS industry representative stationed in Shanghai, China sent this message recently to a U.S. colleague: “Latest unofficial news said that the Compass Interface Control Document (ICD) will be released on 27th this month,  and will be available on the internet on 28th.” Such rumors have floated before, in late 2010, and again in late 2011.  As the U.S. colleague... read more

This article is tagged with , and posted in BeiDou/Compass, GNSS, GNSS News, Government, Government News

RITA Seeks Experienced Electronics Engineer

December 17, 2012By

The Research and Innovative Technology Administration (RITA) seeks an experienced Electronics Engineer interested in joining the Office of Positioning, Navigation, and Timing (PNT).  RITA coordinates the U.S. Department of Transportation’s (DOT) research programs and is charged with advancing rigorous analysis and the deployment of cross-cutting technologies to improve our Nation’s transportation system.  RITA serves as the lead Administration representing DOT... read more

Luch-5B Arrives at Orbital Slot

December 15, 2012By
Luch-5B_new2

The second Russian SBAS satellite, Luch-5B, has now been positioned at its designated orbital slot of 16 degrees west longitude. The satellite had been in a drift orbit since its launch on November 2 at 21:04:00 UTC along with the domestic communications satellite Yamal-300K. Tracking data from NORAD/JSpOC showed Luch-5B arriving at its geostationary position by about December 13. The... read more

This article is tagged with and posted in Augmentation & Assistance, GNSS, GNSS News, Latest News

Transmissions from Galileo Satellite IOV-4 Begin

December 13, 2012By

News courtesy of CANSPACE listserv. The Technische Universitaet Muenchen has reported that transmissions of the L1/E1 signal from Galileo satellite IOV-4 (FM-4) started at about 17:15:10 GPS Time December 12. The navigation signals of both of the recently launched in-orbit validation satellites have now been activated. A number of stations in the Cooperative Network for GNSS Observation as well as... read more

Launch of GPS Satellite Struggled through Tense Moments

December 10, 2012By
United Launch Alliance Delta IV rocket blasts off from Space Launch Complex-37 with the U.S. Air Force’s Global Positioning System (GPS) IIF-3 satellite. This launch marks the 9th ULA launch this year, the 54th Evolved Expendable Launch Vehicle (EELV) mission, and the 65th launch since ULA was formed nearly six years ago.

A new report by Spaceflight Now reveals that the launch October 4 of a GPS satellite experienced tense touch-and-go moments. The Delta 4 rocket’s cryogenic upper stage engine experienced a fuel leak that caused a low-thrust condition. Four-and-a-half minutes into the launch, after the first stage had shut down and separated, the trouble began as the RL10B-2 engine on the... read more

This article is tagged with , , and posted in GPS Modernization, Latest News

Russia Delays Launch of GLONASS-K Satellite

December 3, 2012By

According to RIA Novosti, the launch of Russia’s second GLONASS-K satellite has been delayed until 2013 from its end-of-year launch date, Defense Ministry spokesman Col. Alexey Zolotukhin said on Monday. “The launch has been postponed due to technical flaws in the Fregat booster made by the Lavochkin space company,” Zolotukhin said. The new date for the launch will be set... read more

This article is tagged with , and posted in GLONASS, GNSS News