• 0x0@programming.dev
    link
    fedilink
    English
    arrow-up
    13
    ·
    edit-2
    6 months ago

    The Chinese one is Beidou and I fail to understand why planes use only GPS when my phone has all 4.

    • dogslayeggs@lemmy.world
      link
      fedilink
      English
      arrow-up
      13
      ·
      6 months ago

      Planes only use GPS because GPS has a very rigorous signal integrity program that others don’t have. The “safety of life” requirements on GPS are onerous. Also, GPS has both L1 C/A and L5 (not enough L1C or L2C to be useful yet) signals. I don’t think Galileo or GLONASS have extra signals, but I think Beidou does (not an expert on other systems).

      Just this January, ESA completed the safety of life analysis requirements for Galileo to be used as a civil aviation signal.