TAG: GPS IIF

GPS IIF-5 Launch Delayed

October 22, 2013By

The scheduled October 23 launch of GPS IIF-5, the fifth in the current “follow-on” generation of GPS satellites, has been postponed in order to complete a review of an adjustment made to the rocket’s upper stage engine. A fuel leak in that engine of the Delta 4 rocket during a GPS launch in October of last year created some worries... read more

Col. Bernard Gruber, GPS Directorate: Farewell Perspective on GPS Program

June 12, 2013By

I first met just-pinned-on, shiny and bright, Captain Bernard Gruber-USAF in 1992. Bernie had just arrived at the Space and Missile Systems Center at Los Angeles Air Force Base in California where he would hold several important positions. For those readers not aware of the mission and importance of the Space and Missile Systems Center (SMC), today SMC, which began... read more

Col. Bernie Gruber: Farewell Perspective on GPS Program

June 11, 2013By

This week’s Defense PNT newsletter by GPS World contributing editor Don Jewell carries an exit interview with Col. Bernard “Bernie” Gruber, who is leaving his post as director of the GPS Directorate after more than three and a half years in that position, and concluding his 26-year U.S. Air Force career. Look for the full interview later this week on... read more

GPS Block IIF-4 Launch Set for Today

May 7, 2013By
gpsiif4_Opener

News courtesy of CANSPACE Listerv. Update: The launch window for the liftoff has been adjusted slightly to  21:38-21:56 UTC. The United Launch Alliance (ULA) Atlas 5 rocket’s rollout to the pad  took place Tuesday. Weather forecasters have predicted an 80 percent chance of favorable conditions for launch. Updates on the mission and live video coverage of the launch is available.... read more

Build Your Own GPS IIF Satellite — with LEGOs

February 22, 2013By
GPS-IIF

So, you thought GPS satellites were only built by government contractors with millions of dollars? Think again. A California company that specializes in LEGO kits of space vehicles is offering a GPS IIF satellite kit. The kit, which sells for $45, includes 142 LEGO Bricks, instructions, and a display stand. Once constructed, the model measures 21 1/4-inches from the tip... read more

This article is tagged with and posted in GNSS News

The System: Three’s the Challenge

August 1, 2010By

A small variance in the L5 signal, which remains well within signal specifications and will not affect pseudorange measurements, may show some impact on triple-frequency combinations of the signal’s carrier phase in high-precision applications. Observations suggest a temperature-dependent line bias in one or more carriers as a likely cause of the observed variation in the tri-carrier combination of L1, L2, and L5. read more

This article is tagged with , and posted in GNSS Opinions, GPS Modernization, The System

The System: An L5 Surprise

August 1, 2010By

Researchers at the German Aerospace Center say they have found a small variance in the L5 signal on IIF-1. The signal variation results in no more than a 5-centimeter error with a predictable periodicity of about six hours. The GPS Wing is studying the issue and expects to resolve it before setting the satellite healthy, in another month or so according to the schedule. read more

This article is tagged with , , , , and posted in Aviation & Space, GNSS Opinions, GPS Modernization, The System

The System: New Kid on the Block: IIF Readied

March 1, 2010By
It takes four hefty guys to wheel the new satellite along the tarmac, but it will only take one Delta IV rocket to lift it 20,171 kilometers into space on May 13.

The first Block IIF satellite destined for orbit arrived at the Navstar Processing Facility at Cape Canaveral, Florida, aboard an Air Force C-17 cargo aircraft on February 12. It is now undergoing preparations for its launch this spring on a Delta IV rocket. Block IIF will enhance GPS performance by reportedly providing twice the navigational accuracy of heritage satellites, more robust signals for commercial aviation and search-and-rescue, and greater resistance to jamming in hostile environments. Plus: GLONASS, Beidou, Galileo, 24+3 FAQ, and AEP 5.5C software update. read more

This article is tagged with , and posted in The System