July 13, 2015 – A United Launch Alliance (ULA) Atlas V will launch the GPS IIF-10 mission for the U.S. Air Force on Wednesday, July 15. Liftoff will occur from Space Launch Complex 41 at Cape Canaveral Air Force Station, Florida. The 18-minute launch window opens at 9:36 a.m. MDT. The forecast continues to show a 70 percent chance of favorable weather conditions for launch.
The Navstar Global Positioning System (GPS) is a constellation of satellites that provides navigation data to military and civilian users worldwide. The satellites continuously transmit digital radio signals pertaining to the exact time (using atomic clocks) and exact location of the satellites. With the proper equipment, users can receive these signals to calculate time, location, and velocity. GPS is operated and controlled by the 50th Space Wing, located at Schriever Air Force Base in Colorado.
GPS IIF-10 is one of the next generation GPS satellites, incorporating various improvements to provide greater accuracy, increased signals, and enhanced performance for users. As a result of increased civil and commercial use as well as experience in military operations, the USAF has added the following capabilities and technologies to the GPS IIF series to sustain the space and control segments while improving mission performance:
Two times greater predicted signal accuracy than heritage satellites.
New L5 signals for more robust civil and commercial aviation.
An on-orbit, reprogrammable processor, receiving software uploads for improved system operation.
Military signal “M-code” and variable power for better resistance to jamming hostile environments.
GPS utilizes 24 satellites, in six different planes, with a minimum of four satellites per plane, positioned in orbit approximately 11,000 nautical miles above the Earth’s surface. The GPS IIF series have a design life of 12 years.
Live coverage of the launch will begin at 9:16 a.m. MDT at: