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  2. GPS Block III - Wikipedia

    en.wikipedia.org/wiki/GPS_Block_III

    A major component of the modernization process, a new military signal called M-code was designed to further improve the anti-jamming and secure access of the military GPS signals. The M-code is transmitted in the same L1 and L2 frequencies already in use by the previous military code, the P(Y) code.

  3. GPS signals - Wikipedia

    en.wikipedia.org/wiki/GPS_signals

    The M-code is transmitted in the same L1 and L2 frequencies already in use by the previous military code, the P(Y)-code. The new signal is shaped to place most of its energy at the edges (away from the existing P(Y) and C/A carriers). It does not work at every satellite, and M-code was switched off for SVN62/PRN25 on 5 April 2011. [29]

  4. Selective availability anti-spoofing module - Wikipedia

    en.wikipedia.org/wiki/Selective_availability...

    SAASM does not provide any additional anti-jam capability, however, the higher data (chipping) rate of P(Y) code can provide a higher processing gain which will provide better tracking performance in a jamming environment. Future GPS upgrades, such as M-Code, will provide additional improvements to anti-jam capabilities. [citation needed]

  5. M code - Wikipedia

    en.wikipedia.org/wiki/M_code

    M code or M-Code may refer to: Machine code; MATLAB programming language; M-code, GPS signals for use by the military; M Code, used in conjunction with G-code in the CNC/machining industry; M Formula language, sometimes called M code, a mashup query language used in Microsoft's Power Query

  6. GPS Block IIF - Wikipedia

    en.wikipedia.org/wiki/GPS_Block_IIF

    Like earlier GPS satellites, Block IIF spacecraft operate in semi-synchronous medium Earth orbits, with an altitude of approximately 20,460 km (12,710 mi), and an orbital period of twelve hours. The satellites supplement and partially replace the GPS Block IIA satellites that were launched between 1990 and 1997 with a design life of 7.5 years ...

  7. Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Global_Positioning_System

    The Global Positioning System (GPS), ... Enables new modernized signals (L1C, L2C, and L5) and has M-code capability, which the legacy system is unable to do.

  8. List of GPS satellites - Wikipedia

    en.wikipedia.org/wiki/List_of_GPS_satellites

    Samples of three GPS satellites' orbits over a five-year period (2013 to 2018) USA-242 · USA-239 · USA-151 · Earth As of 22 January 2025, 83 Global Positioning System navigation satellites have been built: 31 are launched and operational, 3 are in reserve or testing, 43 are retired, 2 were lost during launch, and 1 prototype was never launched. 3 Block III satellites have completed ...

  9. USA-319 - Wikipedia

    en.wikipedia.org/wiki/USA-319

    USA-319, also known as GPS-III SV05, NAVSTAR 81 or Neil Armstrong, is a United States navigation satellite which forms part of the Global Positioning System. It was the fifth GPS Block III satellite to be launched.