GNSS

Wildwood eLoran transmitter starts broadcasting Feb. 6

February 2, 2017By

Update (2/9/17): The Wildwood transmitter is back on the air after a presumed lightning strike affected transmissions. The transmitter stopped broadcasting at 5:35 a.m. EST on Feb. 9. Testing took place 5:35 a.m. to  8:19 EST, after which it came back on the air, reports Steve Bartlett, vice president of operations for UrsaNav Inc. The transmitter will be taken off... read more

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US Coast Guard adds security to website

January 31, 2017By

The Coast Guard Navigation Center has implemented a small but important change to its website address. It is now https://www.navcen.uscg.gov, instead of http://www.navcen.uscg.gov. The change provides a secure, encrypted connection between browsers or other tools connecting to the Navigation Center website. It also provides authentication that you are unquestionably connecting to the Navigation Center website. This change is a result... read more

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Interference mitigated with CRP and dual-polarized antennas: Free webinar

January 30, 2017By
February cover story.

Two new topic areas and presentations have been added to this Thursday’s free webinar on Signal Interference: Detection and Mitigation. The speakers will explore anti-jamming protection with controlled radiation pattern antennas (CRPAs) and with dual-polarized antennas. The latter topic is also the cover story for the February issue, which demonstrated a significant improvement in positioning accuracy and robustness against interference... read more

GPS data release to boost space-weather science

January 30, 2017By
An image illustrating the six orbital planes in which GPS satellites (“navigational satellites,” or ns) fly around Earth. This configuration shows the orbits just before the start of this solar cycle’s biggest geomagnetic storm, which occurred on March 17, 2015. The darkest orbital lines indicate the position of the satellites in that moment; the lightest lines indicate where they were 12 hours prior.
(Credit: Los Alamos National Laboratory)

Today, more than 16 years of space-weather data is publicly available for the first time in history. The data comes from space-weather sensors on board the nation’s GPS satellites. The newly available data gives researchers a treasure trove of measurements they can use to better understand how space weather works and how best to protect critical infrastructure, such as the... read more

3 atomic clocks fail on 1 Indian satellite, replacement prepped

January 30, 2017By
IRNSS-B was launched April 4, 2014.

Three atomic clocks onboard a single satellite of the NAVIC Indian regional navigation satellite system have failed. Indian Space Research Organization (ISRO) Chairman A.S. Kiran Kumar told The Hindu newspaper that the agency is trying to restart the clocks. Kumar said the affected satellite, IRNSS-1A, is otherwise healthy, and the rest of the constellation is performing its core function of providing... read more

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NASA to hold workshop on autonomous navigation, GNSS, PNT

January 27, 2017By

The National Aeronautics and Space Administration (NASA) published a notice Jan. 26 in the Federal Register on a planned space navigation workshop. The Workshop on Emerging Technologies for Autonomous Space Navigation is sponsored by NASA Space Communication and Navigations (SCaN) Program. The Feb. 17 workshop is intended to inform industry on evolving positioning, navigation and timing (PNT) technologies and techniques being developed... read more

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AGU concerned over US limits to science communication

January 26, 2017By
AGU-logo

The American Geophysical Union (AGU) wrote to U.S. federal agency heads on Jan. 26, in response to reports that the administration under President Donald Trump has instructed federal agencies to stop communicating with the media, policymakers and the public. “The signals are not encouraging, and they’re alarming, and they’re causing a lot of fear in the scientific community,” Christine McEntee,... read more

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CNN explores space warfare, US military’s use of GPS

January 26, 2017By

A spaceborne laser zaps a GPS satellite, disabling it. A “kamikaze” satellite hits and destroys other nations’ critical satellites. Another satellite moves beside an Intelsat bird — and listens in. A new CNN special considers all of these possibilities in an exploration of an arms race in space, showcasing the devastation that would be caused by space warfare and how the... read more

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