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November 13, 2009

U.S. Air Force Plans to Improve GPS Constellation Geometry for Military Forces in Afghanistan

Combined Joint Task Force 76 helicopter carries troops and supplies over Eastern Afghanistan. Photo by Staff Sgt. Michael Casteel, U.S. Army

U.S. Air Force officials are moving to reconfigure the GPS constellation to create a 27-satellite geometry that will improve the availability and accuracy of positioning, navigation, and timing (PNT) capabilities for U.S. military forces in Afghanistan and Iraq.

Although the constellation currently has 30 operational space vehicles (SVs), not including the SVN49/PRN1 that has still not been set healthy, a number of the spacecraft are located nearby other satellites — effectively creating a 24-SV geometry. (See accompanying figure.)

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By Inside GNSS
June 4, 2009

Changes in Store for U.S. Military GPS Equipment Development and Acquisition

DAGR 2008. Rockwell Collins image

Development and acquisition of military GPS user equipment (MGUE) are taking on new dimensions across the board — institutionally, procedurally, and technologically.

Along the way, the changes could redefine relationships within the Department of Defense (DoD) and between the agency and industry.

At the agency level, a proposal is forthcoming to “stand up” a positioning, navigation, and timing (PNT) user equipment joint program office (JPO) that would incorporate UE responsibilities (and budgets) now exercised by the GPS Wing (GPSW).

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By Inside GNSS
September 19, 2007

ITT SAASM Military Receiver

The Advanced System Improvement Program (ASIP) Embedded GPS Receiver (EGR) from ITT Corporation is a 12-channel Selective Availability-Anti-Spoofing Module (SAASM) GPS receiver using 3.3 volt technology. Designed for military surveying, navigation, and timing applications, the board features dual-frequency (L1/L2) all-in-view tracking with a reported Precise Positioning Service (PPS) accuracy of 10 meters, SEP (spherical error probability). It has RS422, RS232, and CMOS (2) serial ports, selectable 1 pps and 10 pps, time marks (UTC), and1 pps time-sync.

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By Glen Gibbons
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