ALMANAC

摘要

1. "SV Number" refers to space vehicle number. "PRN Number" refers to the satellite's unique pseudorandom noise code. 2. Clock: Rb - rubidium; Cs = cesium. 3. "Launched" and "Usable" dates are based on Universal Time. 4. The current active GPS constellation consists of 12 Block IIRs, 7 Block IIR-Ms and 12 Block IIFs for a total of 31 satellites and is under FOC (Full Operational Capability). The constellation is in the 24+3 (or "Expandable 24") configuration with satellites occupying the fore and aft bifuracted slots in the B, D and F planes.