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GPS satellites broadcast signals that enable a suitable receiver to obtain a position. Each satellite transmits:
  • A
    Ranging signals on the L1 and L2 UHF frequencies.
  • B
    Distance information for civilian users on the L1 UHF frequency only.
  • C
    Receiver position data on the L1 UHF frequency only.
  • D
    Receiver position data on the L1 and L2 UHF frequencies.

062.06.01.02.04: State that each satellite broadcasts ranging signals on two UHF frequencies: L1 and L2.

Satellites transmit navigation data and ranging signals on two main L-band frequencies; L1 at 1 575 MHz and L2 at 1 227 MHz.

Originally, L1 frequency provided the Standard Positioning Service (SPS) accuracy for civilian users and L2 frequency was used by authorised users such as the military in addition to L1 to achieve Precision Positioning Service (PPS). The ranging signal is composed of a navigation data message and a Coarse Acquisition (C/A) code.

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