GNSS

Expert Opinions: Optimum number of GNSS signals for PNT device

February 22, 2016By

Q: What is the optimum number of GNSS signals to include/process in a consumer-grade PNT device?   A: The cost for including additional silicon to a receiver for processing more signals is low, thanks to multiplexing hardware and high clock speeds. Having more satellite measurements allows the receiver to be selective about which ones it actually uses for PVT calculations,... read more

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Antennas: The unsung heroes of the GNSS industry

February 22, 2016By

By Tracy Cozzens Managing Editor Antennas. When I was a kid, antennas meant the pair of rabbit ears sitting on top of the family TV set. We had to constantly adjust the angles to get the best reception, using aluminum foil to improve the signal. Wow, how things have changed. Today, consumer users of smartphones, Fitbits, smartwatches, tablets and a... read more

FY 2017 budget request includes $857 million for GPS

February 19, 2016By

The President’s Budget for Fiscal Year 2017 includes $847.362 million in Department of Defense funds and $10 million in Department of Transportation funds to sustain and modernize the Global Positioning System (GPS). Funds will go toward the GPS III program, including the new ground system (OCX), military user equipment, and wide-area augmentation through the Federal Aviation Administration (FAA). FY 2017... read more

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Final GPS IIF satellite joins constellation

February 16, 2016By
SCHRIEVER AIR FORCE BASE, Colo. -- Col. Stephen Slade, 50th Space Wing IMA, assumes control of SVN-70, a GPS IIF-12 satellite, from 14th Air Force in a short ceremony here, today.  This transfer of control marks the end of an era for the IIF series satellites as SVN-70 was the final model to be launched, giving the 2nd Space Operations Squadron a total of 41 satellites under their control.  (U.S. Air Force photo/Christopher DeWitt)

The 50th Space Wing accepted satellite control authority of the final Global Positioning System GPS IIF satellite from the GPS Directorate during a ceremony held Feb. 12 at Schriever Air Force Base, Colorado. Following its launch from Cape Canaveral Air Force Station, Florida, Feb. 5, operators from the 50th and 310th Space Wings completed an extensive checkout of the satellite... read more

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GPS IIF-12 satellite is now active

February 11, 2016By

The last Block IIF satellite, launched on Feb. 9, is active. “All-in-view” tracking stations of the International GNSS Service (IGS) network have been receiving its signals since Feb 10. The satellite’s designation is PRN32/SVN70. That PRN is already included in the analysis by the Center for Orbit Determination in Europe (CODE). The IGS orbit products will now cover 57 satellites (32 GPS plus 25... read more

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System of Systems: GPS III bidding, testing

February 9, 2016By
IRNSS 1D in earlier lab testing.

GPS III Bidding Opens — Again The GPS Directorate at the Space and Missile Systems Center (SMC) continues to look for someone to build 22 GPS III satellites in the near future. SMC issued a request for proposals on Jan. 8, with rather complicated terms. The first eight GPS III satellites are already under contract, and two have been built,... read more

Russia launches GLONASS-M 51 into orbit

February 8, 2016By
GLONASS-M-51-launch-7

A GLONASS-M satellite was launched into orbit on Feb. 7 at 03:21 Moscow time from the Plesetsk Cosmodrome spaceport, reports the Russian space agency Roscosmos.  The Russian Defense Ministry successfully launched GLONASS-M 51 (known as 751 in orbit) aboard a Soyuz-2.1b rocket with a Fregat upper stage. Three and a half hours after lift-off, the satellite separated from the upper stage and ground control established communications with it. The... read more

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Air Force successfully launches GPS IIF-12 satellite

February 8, 2016By
A United Launch Alliance (ULA) Atlas V rocket carrying the GPS IIF-12 mission lifted off from Space Launch Complex 41 at Cape Canaveral. (Photo: ULA)

The U.S. Air Force successfully launched the 12th Boeing-built GPS IIF satellite aboard a United Launch Alliance Atlas V Evolved Expendable Launch Vehicle from Space Launch Complex 41, Cape Canaveral Air Force Station, Fla., at 8:38 a.m. EST (5:38 a.m. PST) on Feb. 5. “Today’s launch is a significant achievement in the history of GPS, as we launch the last of... read more