Inside GNSS • June 2010
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
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
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
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
Ventures • April 13, 2010
Septentrio and FreeFlight Systems will develop new GPS/SBAS (Satellite Based Augmentation System) receivers for air traffic control as part of a new strategic partnership announced on April 13.
April 10, 2010
[updated April 13] Federal Aviation Administration (FAA) officials say that loss of control over an Intelsat geostationary (GEO) carrying a GPS Wide Area Augmentation System (WAAS) transponder could subject users in the National Air Space (NAS) to temporary outages for the rest of this year, beginning within the next two to four weeks as the GEO drifts out of a useable orbit.
Intelsat S.A. announced the anomaly in Galaxy 15 (G-15) on April 8. Although the communications services provided by G-15, located at 133 degrees west longitude (WL), have not been affected, according to Intelsat, the satellite apparently is not responding to commands by controllers. The anomalous condition began on April 3, according to the FAA.
The Luxembourg-based Intelsat is moving an older spacecraft (G-12) that serves as a backup for G-15 from its location at 123 degrees WL. However, G-12 does not have an L-band transponder, which is needed for WAAS transmissions.
April 12, 2010
May 4, 2010 - May 5, 2010
Los Angeles, California
April 9, 2010
(This article first appeared in the March 31 Inside GNSS SIGNALS eNewsletter)
The GPS Wing is in the middle of a yearlong process designed to sort out the trade-offs among a set of at least nine options that may be undertaken to reduce the effects of a signal anomaly on the GPS satellite known as SVN49.
In a March 26 teleconference, the first of two scheduled to discuss the options, Lt. Col. James Lake, the wing’s deputy chief engineer, emphasized that some of the options could well improve the performance of some receivers while decreasing that of others.
He underlined the Air Force's concern that receivers that don't conform to the specification for GPS space segment/navigation user interfaces (IS-GPS-200) "greatly complicate the issue."