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by Staff Writers Los Angeles AFB CA (SPX) Nov 11, 2010
There's no satellite system that touches so many lives in so many ways around the world like the Global Positioning System. From finance to farming, from ATMs to UAVs, from rescue missions to shopping trips, GPS is the premier provider of positioning, navigation and timing services for civil and military users worldwide. The current GPS constellation has the most satellites and the greatest number of capabilities ever. GPS continues to address the growing needs of the military, civil and commercial users around the globe. Launched on May 27, aboard a United Launch Alliance Delta IV Medium rocket, GPS IIF-1 completed three months of comprehensive on-orbit testing to validate its operations with the ground control system, other GPS satellites and a wide range of military and commercial GPS ground receivers. Since this was the first of 12 IIF space vehicles to be launched, the testing regimen was longer and more rigorous than usual. On Aug. 25, the GPS Wing transferred Satellite Command Authority for GPS IIF SV-1 to the 2nd Space Operations Squadron at Schriever Air Force Base, Colo. The following day, the squadron announced that GPS IIF satellite (SVN-62) was set healthy. GPS IIF-1 going operational is great news for the nearly one billion users that depend on GPS services. Not only is GPS IIF-1 joining the 30 satellites on-orbit in the GPS constellation, the most robust and capable system in the history of space, it's introducing new and enhanced capabilities for military and civil users. GPS IIF continues the modernization efforts to provide new space-based capabilities to ensure GPS remains the gold standard for positioning, navigation and timing. Some of the key capabilities that the new GPS IIF satellites will provide:
Greater accuracy through advanced atomic clock technology On-orbit testing of GPS IIF-1 already shows excellent performance - in some categories, the best in the constellation. Performance will improve as on-orbit adjustments continue.
Military signals more resistant to attempted jamming The military signal on the GPS IIF satellites is specially formatted to counter jammers better than current GPS satellites. GPS IIF also has a variable power capability that allows operators to increase signal power to break through jamming attempts.
New civilian signal Beyond transportation, L-5 will provide users worldwide with the most advanced civilian GPS signal that, when used with other civilian signals, can enable sub-meter accuracy and longer-range operations. On-board reprogrammable processor with greater capability to receive updated software on orbit Older GPS satellites have limited updating capability; the IIFs carry onboard throughput and memory margins to update both the GPS navigation system and the satellite's operating system.
Longer design life for reduced operating costs Past system performance indicates that the satellites could likely last much longer. Approximately a dozen Boeing-built GPS IIA satellites are still in operation, some lasting two or three times longer than their original design lives. The entire GPS constellation is controlled by the Operational Control System. OCS has had no interruptions of service or mission since activation in 2007. OCS has improved operations, increased efficiency and provided a foundation for new capabilities, such as the Selective Availability Anti-Spoofing Module, which provides security against fake satellite signals
Related Links AFSPC GPS Applications, Technology and Suppliers
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