200809 September/October 2008

Air Force Hopes for November, December Launches of Final GPS IIR-Ms
July 31, 2008

Air Force Hopes for November, December Launches of Final GPS IIR-Ms

UPDATED SEPTEMBER 10 2008: With replacement parts currently being manufactured for faulty components that have delayed launch plans, Air Force GPS program managers hope to get the final two modernized Block IIR satellites on orbit by the end of the year.

A tentative launch date of November 7 has been targeted for the Block IIR-20(M), which will carry a payload that includes an experimental L5 signal. If all goes well, the final IIR launch would take place by December 31.

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By Glen Gibbons
First GIOVE-A/B Double Difference Observed
July 8, 2008

First GIOVE-A/B Double Difference Observed

GIOVE-A/B Double Difference Ambiguity Measurements, TU Delft

Researchers at Delft University of Technology (TU Delft), the Netherlands, succeeded this week in simultaneously tracking the GIOVE-A and GIOVE-B L1 Open Service signals in space, producing the first reported computation of a double-difference carrier phase integer ambiguity resolution on the first two experimental Galileo satellites in orbit.

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By Glen Gibbons
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