Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
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May 24, 2010

GPS Block IIF: A Third Cancellation

The third time wasn't the charm for an attempted first launch of a GPS follow-on (Block IIF) generation of satellites.

Problems with ground support equipment and then with the telemetry signal between the spacecraft and the ground equipment have delayed initial launch of the new-generation satellite three times in the last four days.

Originally scheduled for May 20, the launch was postponed again on May 21 and May 23. Mission controllers hope to get the IIF off the ground on May 24.

May 22, 2010

GPS IIF Launch Scrubbed on Pad for Second Time

Launch managers canceled the second attempt to place the first GPS Block IIF satellite in orbit on Friday, May 21, when the telemetry signal between the spacecraft and the satellite ground support equipment was lost minutes before scheduled liftoff. The problem could not be resolved in time to launch during the 18-minute launch window. 

Another launch attempt has been set for Sunday, May 23, betwen 11:17 and 11:35 p.m. (EDT). The first launch effort on May 20 was called off when a problem with ground support equipment was detected during the day.

Events • May 20, 2010

ESA Sponsors GNSS Summer School this September in Denmark

Online registration is open for the fourth International Summer School on Global Navigation Satellite systems. The 10-day course will take place at the GPS Center at Aalborg University in Slettestrand, Denmark from Wednesday afternoon, September 1 through Saturday morning, September 11.

Held for the first two years at University FAF Munich, it now takes place in Denmark with two new lead sponsors, the European Space Agency and Nokia.

September 1, 2010 - September 11, 2010
Slettestrand, Denmark
May 19, 2010

Equipment Problem Delays First GPS IIF Launch

A ground equipment problem has caused a 24-hour delay in launch of the first GPS IIF satellite (GPS IIF-SV1).

Originally scheduled for late May 20, the launch attempt has been reslotted to a May 21 launch window of 11:25 to 11:43 p.m. (EDT)

During normal processing for the launch from Cape Canaveral, Florida, mission managers determined that a piece of ground support equipment used to control one of the swing arms on the fixed umbilical tower was not operating correctly and needed replacing.

Replacing the GSE component will add one day to launch processing, according to the United Launch Alliance managers. This will be the first launch of a GPS satellite on the Boeing Delta IV rocket.

Inside GNSS • June 2010

Easy Suite II

Newcomers often have difficulties imagining what the satellite orbits actually look like.

We say that the constellation consists of some 30 satellites orbiting in six different planes, all making an angle with the Equator of 55 degrees and rotated 60 degrees compared to the previous plane. Figure 1 shows the situation as seen from far away in space, in what we call an inertial frame.

New Builds • May 14, 2010

NovAtel Inc. Announces New OEMStar Models, New SPAN IMU

Canadian GNSS OEM manufacturer NovAtel Inc. has introduced five new models to its low cost, L1 OEMStar receiver card product line and four new models to the OEMStar-supported FlexPak-G2 enclosure product line. The Calgary, Alberta–based company has also added a new inertial measurement unit (IMU) option to its SPAN (Synchronous Position, Attitude and Navigation) GNSS/inertial product line.

Inside GNSS • May 2010

Letters: TIMATION Developer's Honor Draws Fire

EDITOR'S NOTE: On March 31, Inside GNSS published an online article," National Inventors Hall of Fame Inductees Include TIMATION Developer." It reported the induction of Roger Easton into the National Inventors Hall of Fame. We subsequently received a letter from Bradford Parkinson.

April 19, 2010

U.S. Air Force Prepares First IIF GPS Satellite for Launch on May 21

Launch of the first GPS Block IIF (follow-on) satellite is currently scheduled for May 21 from Cape Canaveral aboard a Delta-IV Evolved Expendable Launch Vehicle (EELV), with a destination in the constellation’s B2 plane and slot.

The IIF-1 SV (space vehicle) is at the launch site and fueled. A final IIF launch mission dress rehearsal (MDR) was scheduled to take place during the weeks of April  26 to May 7.

October 20, 2010 - October 22, 2010
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