The fourth US Air Force modernized
Global Positioning System Block IIR
satellite has been launched successfully.
It is the 4th in a series of eight Block
IIR-M spacecraft that Lockheed Martin
Navigation Systems has modernised for its
customer, the Global Positioning Systems
Wing, Space and Missile Systems Center,
Los Angeles Air Force Base,CA, USA.
Each satellite includes a modernized
antenna panel providing increased signal
power to ground receivers, 2 new military
signals for improved accuracy, enhanced
encryption and anti-jamming capabilities
for the military, and a second civil signal
that will provide users with an open
access signal on a different frequency. |