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GPS employs two frequencies, L1 and L2, to offer Standard Positioning Service (SPS) and Precise Positioning Service (PPS). L1 is essential for delivering...
  • A
    PPS using only the C/A code, while SPS requires both the C/A code and the P code transmitted on L1 and L2.
  • B
    SPS using only the C/A code, while PPS requires the P code, which is transmitted on both L1 and L2.
  • C
    PPS using both the C/A code and the P code, while SPS requires the C/A code transmitted on L2.
  • D
    SPS using the P code, while PPS requires both the C/A code and the P code transmitted on L1 and L2.

Learning Objective 062.06.01.02.05: State that SPS is a positioning and timing service provided on frequency L1.

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

Learning Objective 062.06.01.02.10: State that two codes are transmitted on the L1 frequency, namely a coarse acquisition (C/A) code and a precision (P) code. The P code is not used for standard positioning service (SPS).

Satellite signals transmit on two frequencies. These are identified as L1 (1575.42 MHz) and L2 (1227.60 MHz). Each RF signal is modulated by Binary Phase Shift Keying (BPSK).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 using the C/A code.
  • 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 using the C/A and P codes.

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