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  • strange trajectory

    Hello,

    Yesterday, with my android phone, I was following a plane with a strange trajectory. This aircraft was finally disappear.
    Is this normal?



  • #2
    T-MLAT says its all. its calculated positioning using MLAT. Not actual. It needs 3+ receivers to get signal or can misplace on maps.

    http://www.multilateration.com/surve...ateration.html
    Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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    • #3
      And that was not a good way to get your post counts up to make your first real post. There are other methods to display images by hosting on host sites and providing text based links (as links are also disabled for low post) than post on random threads :/

      You were nearly banned as a foreign spammer

      http://www.flightradar24.com/faq
      I was following an aircraft when it suddenly disappeared, why?
      In most cases the reason is that the coverage from the surrounding receivers has been lost. It can also be a technical problem somewhere. Coverage at the same spot can be different depending on data source and aircraft type. Please read How it works for information about how Flightradar24 works, coverage and aircraft visibility.
      http://www.flightradar24.com/how-it-works

      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 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 during 2015 and 2016.
      Posts not to be taken as official support representation - Just a helpful uploader who tinkers

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      • #4
        Thank you for your explanations.

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