GNSS News

Braxton LADO System Supports 10th GPS Satellite Initialization

April 21, 2014By

GPS IIF-5 was launched on February 20 and turned over to the 2nd Space Operations Squadron (2 SOPS) for operations on March 5. This was the 10th successful launch and initialization using Braxton Technologies‘ Launch, Anomaly Resolution, and Disposal Operations (LADO) system. LADO has performed all the mission planning, commanding and telemetry processing necessary to prepare all GPS satellites for... read more

Delay in Setting Recently Launched Block IIF Satellite Healthy

April 17, 2014By
A United Launch Alliance Delta IV lifts off from Space Launch Complex-37 with the Air Force's Global Positioning System (GPS) IIF-5 satellite. This launch marked the 25th Delta IV flight since the first flight in 2002.

The latest GPS Block IIF satellite, IIF-5 or SVN64 (operating as PRN30), was launched on February 21, 2014. Typically, GPS satellites are checked out and made operational within about a month following launch. SVN64 has yet to be set healthy. The delay is due to an extended navigation test being performed by the GPS master control station. A navigation upload... read more

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

Protect, Toughen, Augment: Words to the Wise from GPS Founder

April 15, 2014By
Brad Parkinson

“What can we do to reduce the vulnerability [of GPS] and ensure that the expectations of the public are going to be met?” asked Dr. Bradford Parkinson as he opened his presentation this morning (Tuesday, April 15) at the European Navigation Conference, ENC-GNSS 2014 in Rotterdam, The Netherlands. Parkinson went through his 61-slide, 50-minute briefing on what he called “PTA”... 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 GLONASS, GNSS News, Latest News

Second of Seven Satellites for IRNSS Launched

April 4, 2014By
IRNSS-B-O2

India’s Indian Space Research Organisation (ISRO) launched its second navigation satellite today, April 4, at 11:44 UTC. A Polar Satellite Launch Vehicle (PSLV) rocket launched the IRNSS-1B spacecraft in a mission originating from the Satish Dhawan Space Centre. Liftoff was on schedule. IRNSS-1B is the second of seven satellites that comprise the first-generation Indian Regional Navigation Satellite System (IRNSS). IRNSS-1B... read more

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

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