GLONASS

GLONASS Loses Control Again

April 16, 2014By
glonass_problem

The GLONASS constellation has suffered a major problem for the second time this month. On Monday, April 14, eight GLONASS satellites were simultaneously set unhealthy for about half an hour, meaning that most GLONASS or multi-constellation receivers would have ignored those satellites in positioning computations. In addition, one other satellite in the fleet was out of commission undergoing maintenance. This... read more

Locata Warns: Lessons to Be Learned from GLONASS Spasm

April 15, 2014By
Locata-O

Calling it an “unprecedented and deeply worrying total disruption . . . [that] shook the industry,” Locata Corporation reiterated its call for redundant terrestrial systems to back up GNSS in the wake of the April 1 11-hour GLONASS system outage. Nunzio Gambale, Locata CEO, said “We have been telling the industry for years that you cannot have a critically important... read more

GLONASS Transitions to New Geocentric Coordinate System

April 11, 2014By

The transition to using the terrestrial geocentric coordinate system “Parametry Zemli 1990” (PZ-90.11) in operating GLONASS has been implemented, according to an April 4 announcement by the Russian Federal Space Agency’s Information-Anayltical Center. The implementation fulfills Russian Government Resolution № 1463 of December 28, 2012, “On the Common National Geodetic Coordinate Systems,” outlining the transition starting at 3 p.m. on... read more

This article is tagged with and posted in Aviation & Space, GLONASS, GNSS News, Government News, Latest News

GLONASS Failure Inconsequential to Users, Says Russian Press

April 8, 2014By

Reports in the semi-official Russian news daily Izvestia indicate that finger-pointing has gotten underway regarding the April 1 GLONASS systemic blackout, which followed two other high-profile disasters, the destruction-upon-launch of three new GLONASS satellites in July 2013, and the Pacific drowning of three other satellites in December 2010. While we have neither full nor fluent translations from the Russian, we... read more

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

GLONASS Blackout Coincides with Loran Authorization-in-Progress

April 8, 2014By

Russia’s April 1 GLONASS blackout occurred, ironically, only hours after the U.S. House of Representatives passed legislation to preserve infrastructure that could support a back-up system for GPS that could be used for critical infrastructure and applications in the event of a similar disaster occurring in the United States. The 2014 Coast Guard Authorization Act requires the Department of Homeland... read more

This article is tagged with and posted in Augmentation & Assistance, GLONASS, GPS Modernization, Latest News

Altus Positioning Systems Pinpoints Cause for GLONASS Default

April 4, 2014By

Regarding the April 1–2 11-hour downtime for the full GLONASS constellation, president and CEO Neil Vancans of Altus Positioning Systems provides this additional information: “From the reports on GLONASS problems, we have an explanation that may be used in our technical support replies: “Our analysis reveals the GLONASS integration algorithms skipped an interval of around 1.5 minutes at the control... read more

How to Survive a Total Constellation Outage

April 3, 2014By
Broadcom-O3

Yesterday we posted news of an 11-hour downtime for the full GLONASS constellation, due to an upload of bad ephemerides. Coincidentally, during that 11-hour period, the mass-market chip company Broadcom was conducting multi-constellation receiver tests in Asia. Frank van Diggelen, Broadcom’s chief GNSS scientist and vice president says, “We have definitive data to show how a multi-constellation receiver survives such... read more

GLONASS Gone . . . Then Back

April 2, 2014By
glonass_problem-O

In an unprecedented total disruption of a fully operational GNSS constellation, all satellites in the Russian GLONASS broadcast corrupt information for 11 hours, from just past midnight until noon Russian time (UTC+4), on April 2 (or 5 p.m. on April 1 to 4 a.m. April 2, U.S. Eastern time). This rendered the system completely unusable to all worldwide GLONASS receivers.... read more