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Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
GPS Galileo Glonass BeiDou Regional/Augmentation
Inside Unmanned Systems
Thought Leadership Series
Regional/Augmentation
Inside GNSS • March/April 2010

Wide-Area RTK

A common assumption in real-time kinematic (RTK) techniques is that the differential ionospheric delay between a GNSS transmitter and each of the roving or reference receivers is negligible. However, increased position uncertainty — spatial decorrelation — is usually allocated to the baseline receivers as baseline distances increase.

A refinement of this assumption comes with the network RTK (NRTK) using a set of permanent receivers to mitigate atmospheric dependent effects, such as the ionospheric delay, over distance.

Ventures • February 3, 2010

JAXA Gives QZSS Satellite a Nickname - “Michibiki"

The Japanese Space Agency has selected a nickname for its first GNSS satellite: “Michibiki.”  JAXA received more than 11,000 entries in its recent contest to raise national awareness of the GPS augmentation program.

The first of three Quasi-Zenith satellites will launch during the Japanese 2010 fiscal year, sometime before March 31, 2011. 

New Builds • January 19, 2010

GMV Receives Contract to Develop GAGAN Receiver Algorithm

Raytheon Company has awarded a new contract to GMV to develop a prototype algorithm to mitigate ionospheric effects on users of India’s GAGAN (Global Positioning Satellite-Aided Geosynchronous Augmented Navigation System),

Thinking Aloud • January/February 2010

More of the Same

A favorite movie scene: Yul Brynner as Rameses II in The Ten Commandments sternly asserting, “So let it be written; so let it be done.”

With a similar peremptory gesture, the U.S. Coast Guard (USCG) published its notice in the January 7 Federal Register certifying that abolition of the Loran-C system would not adversely affect the safety of maritime navigation and ordering its decommissioning beginning February 8.

June 21, 2010 - June 24, 2010
Seattle, Washington USA
January 6, 2010

USCG Publishes Loran-C Termination; DHS Says Not Needed for GPS Backup

(UPDATED January 7, January 12) The U.S. Coast Guard (USCG) posted a notice in the Federal Register on January 7 certifying that termination of the Loran-C signal will not adversely affect the safety of maritime navigation and that decommission will begin on February 8 with all Loran stations expected to cease transmitting the Loran-C signal by October 1, 2010.

Meanwhile, the Department of Homeland Security has certified that the Loran-C system infrastructure is not needed as a backup to the GPS system or to meet any other federal navigation requirement.

January 25, 2010 - January 26, 2010
Bangkok, Thailand
December 18, 2009

President Signs Appropriations Measure with GPS Civil Funds

President Obama signed the Fiscal Year (FY10) consolidated appropriations bill (H.R. 3288) on Wednesday (December 16), which will fund a number of civil GPS initiatives in the coming year.

November 30, 2009 - December 2, 2009
Berlin, Germany
November 11, 2009

Obama Signs Bills Cutting Funds for eLoran, HIGPS, GPS OCX

President Obama had a big day on October 28, signing 2010 bills for the departments of defense (DoD) and homeland security (DHS) that cut significant programs — eLoran, HIGPS, OCX — connected with the Global Positioning System.

Signals
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