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Not picking up mode S

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  • #31
    Mode S is just a fancier Mode C transponder.

    It transmits a unique ICAO address and altitude.



    There are extended Mode S messages, which transmit ADS-B information, but not every Mode S transponder is designed to do that.
    So a plane with ADS-B capability will also transmit the normal Mode S signals, but also broadcast position.

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    • #32
      Originally posted by T-EGPE30 View Post
      So what does Mode S achieve?
      Other than giving a unique identifier code to SSR radar for ATC and control to see? Where its important to know where things are..



      Remember the technology is made for the aviation industry. Not primarily us/the hobbiest web pages that can also do stuff with the signals sent out and designed for ATC as a bonus

      You will recall a FAQ link earlier in this thread

      MLAT
      In some regions with coverage from several FR24-receivers we also calculate positions of non-ADS-B equipped aircraft with the help of Multilateration (MLAT), by using a method known as Time Difference of Arrival (TDOA). By measuring the time it takes to receive the signal from aircraft with an older ModeS-transponder, it's possible to calculate the position of these aircraft. Four FR24-receivers or more, receiving signals from the same aircraft, are needed to make MLAT work. MLAT coverage can only be achieved above about 3,000-10,000 feet as the probability that four or more receivers can receive the transponder signal increases with increased altitude.

      Most parts of Europe and North America are today covered with MLAT above about 3,000-10,000 feet. There is also some MLAT coverage in Mexico, Brazil, South Africa, India, China, Japan, Taiwan, Thailand, Malaysia, Indonesia, Australia and New Zealand. More areas will get MLAT coverage as we continue to add new receivers to our network.
      ATC have other ground based systems in place that do similar, technology and designs since WW2. Mode-S is an advancement on standard Mode A/C queries. And modeS-ES (or ADS-B) includes yet more data. Like GPS, Temperature, Rate of climb and so on.

      Automatic dependent surveillance—broadcast (ADS–B) is a surveillance technology in which an aircraft determines its position via satellite navigation and periodically broadcasts it, enabling it to be tracked. The information can be received by air traffic control ground stations as a replacement for secondary surveillance radar, as no interrogation signal is needed from the ground. It can also be received by other aircraft to provide situational awareness and allow self-separation.
      /edit gah wiedehopf - I was mid novel
      Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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      • #33
        A ADS-B transponder does not necessarily transmit the position. But it has tha ability to do so. It needs to be set up, AND the transponder needs a position input (from a FMC, GPS, whatever).

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