Data Hacking

To be capable of passive all-weather operations
To provide continuous real-time information
To provide support for an unlimited number of users and areas
Appendix A — GPS Primer
To provide high-precision information for military and government use
To provide support to civilian users at a slightly less accurate level
Here are some interesting facts about the GPS SVs:
Power plant:
Weight:
Height:
■ The SVs are powered by solar panels generating 800 watts.
■ The panels on the newer Block IIFs have been upgraded to generate 2,450 watts.
■ Block IIA: 3,670 pounds (1,816 kilograms)
■ Block IIR: 4,480 pounds (2,217 kilograms)
■ Block IIF: 3,758 pounds (1,705 kilograms)
■ Block IIA: 136 inches (3.4 meters)
■ Block IIR: 70 inches (1.7 meters)
■ Block IIF: 98 inches (2.4 meters)
Width (includes wingspan)
■ Block IIA: 208.6 inches (5.3 meters)
■ Block IIR: 449 inches (11.4 meters)
■ Block IIF: approximately 116 feet (35.5 meters)
Design life:
■ Block II/IIA: 7.5 years
■ Block IIR: 10 years
■ Block IIR-M (modernized): 8.57 years
■ Block IIF: 11 years
Date of first launch: 1978
Launch vehicle: Originally, the Delta II rocket was used; but for the bigger Block IIF
SVs, the EELV launch vehicle was used.
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