TAG: CGSIC

CNAV Performance ‘Matches or Slightly Outperforms’ Legacy Signals

March 19, 2015By

A quarterly meeting of the U.S. GPS Program’s interagency Civil Navigation Signals (CNAV) Tiger Team on March 5 focused on the new L2C and L5 GPS civil signals. “CNAV Message Types 10, 11, 30 and 33 are currently transmitted on seven GPS IIR-M (L2C) and eight GPS IIF satellites (L2C and L5),” wrote Rick Hamilton, CGSIC Executive Secretariat, USCG Navigation Center, in a status email to the Civil Global Positioning System Service... read more

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Leap Second Implementation Confuses Some Receivers

February 2, 2015By

The United States Civil GPS Service Interface Committee (CGSIC) has issued a notice about a problem some receivers are having implementing the correct time. The U.S. Coast Guard Navigation Center has received reports of synchronization issues since the implementation of a leap second on Jan. 21. Users experiencing this problem should contact the receiver manufacturer for a firmware or software update. Below is the... read more

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Air Force Shares GPS Status at CGSIC at ION GNSS+

September 10, 2014By

News courtesy of CANSPACE Listserv. Two U.S. Air Force officers provided a GPS program update at Tuesday morning’s Civil GPS Service Interface Committee meeting plenary session at the ION GNSS+ 2014 conference in Tampa, Florida. Here are some key points from the presentations by Colonel Matthew Smitham, deputy director, GPS Directorate, and Lieutenant Colonel Todd Benson, Commander, Second Space Operations Squadron: 31 primary... read more

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CGSIC Releases GPS Interface Documents, Opens Registration

June 30, 2014By

Three new GPS Interface Specification documents have been issued by the Civil Global Positioning System Service Interface Committee: Navstar GPS Space Segment/Navigation User Interfaces (IS-GPS-200H, 24 Sep 2013) Navstar GPS Space Segment/User Segment L5 Interfaces (IS-GPS-705D, 24 Sep 2013) Navstar GPS Space Segment/User Segment L1C Interface (IS-GPS-800D, 24 Sp 2013) The new documents are posted on the NAVCEN GPS References... read more

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CGSIC Issues Notice on Problem with Certain GPS Devices

May 16, 2014By

Flawed processing of GPS satellite data in some GPS receiver chipsets has caused concern, but the problem is not with the GPS constellation itself. “SVN 64 broadcasts a data message that clearly indicates SVN 64 is unusable for navigation. Nevertheless, the U.S. government has confirmed that certain GPS receivers are using data from SVN 64, in violation of GPS interface... read more

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Predicted Ephemeris: Waste of Time or an Untapped Resource?

September 18, 2013By
This map of Portland by Geoloqi has 2.5 million data points.

GPS World contributing editor Eric Gakstatter gave a talk on predicted ephemeris at the Civil GPS Service Interface Committee (CGSIC) on Tuesday. The talk was invited and the topic was suggested by CGSIC coordinators. The 53rd meeting of the CGSIC was held Monday and Tuesday before the Institute of Navigation GNSS+ 2013 Conference. Here is Eric’s talk: Whenever I point... read more

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CGSIC Agenda Released

September 10, 2013By

The 53rd meeting of the Civil GPS Service Interface Committee will be held Monday and Tuesday, September 16-17, before the Institute of Navigation GNSS+ 2013 Conference. Both events take place at the Nashville Convention Center, in Nashville, Tennessee. The meeting agenda is now available on the event website. Monday morning’s CGSIC concurrent sessions include the Timing Subcommittee and the Surveying,... read more

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Gakstatter Reports on CGSIC Meeting

August 20, 2012By

GPS World Survey and GIS editor Eric Gaskstatter attended the CGSIC (Civil GPS Service Interface Committee) State and Local Government subcommittee meeting in Seattle August 14, and provided a report in his Survey Scene editorial. read more

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