description GPS Block IIR-M Overview
GPS Block IIR-M (Modernized) satellites are upgraded versions of the Block IIR GPS navigation satellites built by Lockheed Martin, launched for the US Air Force between 2005 and 2009. Eight Block IIR-M satellites were deployed from Cape Canaveral aboard Delta II rockets. These satellites introduced two key signal additions to the GPS constellation: a modernized military M-code signal with enhanced security and jamming resistance, and L2C, a second civil signal transmitted on the L2 frequency intended for civilian applications.
insights Ranking position
GPS Block IIR-M ranks #79 of 187 in the Satellite ranking, behind SMOS, ahead of NOAA-19.
help GPS Block IIR-M FAQ
What improvements do GPS Block IIR-M satellites add over the earlier Block IIR?
The Block IIR-M (Modernized) satellites added two new signals to the GPS constellation: a more robust military signal called M-code and a second civil signal known as L2C. These upgrades improved accuracy, signal security, and resistance to jamming for both military and civilian users.
How many GPS Block IIR-M satellites were launched?
Eight Block IIR-M satellites were deployed from Cape Canaveral aboard Delta II rockets. All were built by Lockheed Martin for the U.S. Air Force as part of the ongoing modernization of the GPS constellation.
Who built the GPS Block IIR-M satellites?
The Block IIR-M satellites were built by Lockheed Martin as upgraded versions of the earlier Block IIR design. Lockheed Martin has been a long-time contractor for multiple generations of GPS satellites.
When were the GPS Block IIR-M satellites deployed?
The eight Block IIR-M satellites were launched between 2005 and 2009 from Cape Canaveral, Florida. They bridged the gap between the original Block IIR series and the newer Block III satellites that began launching years later.
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