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The satellite navigation system NAVSTAR GPS uses two navigation frequencies, L1 and L2.
Choose the correct statement:

SPS: standard positioning service
PPS: precise positioning service

  • A
    The L1 frequency is used for PPS and the L2 frequency is used for SPS.
  • B
    Only the L1 frequency is used for PPS.
  • C
    Only the L2 frequency is used for PPS.
  • D
    Both L1 and L2 frequencies are used for PPS.

062.06.01.02.06: State that PPS uses both frequencies L1 and L2.

There are two modes of operation of NAVSTAR GPS, each with a different accuracy.

  • The Standard Positioning Service (SPS) is available for civilian users. SPS is a positioning and timing service provided on frequency L1.
  • The Precise Position Service (PPS) is only available for authorised users, such as the military. PPS provides a higher accuracy than SPS and uses both frequencies L1 and L2.

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