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Modernizing GPS IIR Satellites

September 25, 2000
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Weekly update

The U.S. Air Force recently awarded Lockheed Martin Space Systems, Sunnyvale, Calif., a $53 million contract to begin development of modernization changes for up to 12 Global Positioning System (GPS) Block IIR satellites. The GPS IIRs will be modified to incorporate, among other improvements, a second civil signal and two new military signals, thus providing military and civilian users of the navigation system a system with improved capabilities much sooner than previously envisioned. The GPS IIR modifications will include increased signal power and the ability to reprogram signals and power on orbit. These improvements will provide for improved accuracy and better resistance to jamming. An anticipated contract completion date is September 2001. For a high-resolution image of the GPS IIR satellite, please visit:

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