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    • Frequencies used by GPS

      Frequencies used by GPS

      GPS Frequencies
      Band Frequency (MHz) Phase Original usage Modernized usage
      L1 1575.42 (10.23×154) In-phase (I) Encrypted Precision P(Y) code
      Quadrature- phase (Q) Coarse-acquisition (C/A) code C/A, L1 Civilian (L1C), and Military (M) code
      L2 1227.60 (10.23×120) In-phase (I) Encrypted Precision P(Y) code
      Quadrature- phase (Q) Unmodulated carrier L2 Civilian (L2C) code and Military (M) code
      L3 1381.05 (10.23×135) Used by Nuclear Detonation (NUDET) Detection System Payload (NDS); signals nuclear detonations/ high-energy infrared events. Used to enforce nuclear test ban treaties.
      L4 1379.913 (10.23×1214/9) (No transmission) Being studied for additional ionospheric correction
      L5 1176.45 (10.23×115) In-phase (I) (No transmission) Safety-of-Life (SoL) Data signal
      Quadrature- phase (Q) Safety-of-Life (SoL) Pilot signal
       
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