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Thread: MLAT Data

  1. #1
    Purser
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    MLAT Data

    Jut curious guys, i know MLAT is non ADS-B data, what does the Letters standfor. I see that on the FR24 map u can click on or off MLAT traffic??

  2. #2
    Super Moderator speedbird1960's Avatar
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    Quote Originally Posted by Andrew Dale View Post
    Jut curious guys, i know MLAT is non ADS-B data, what does the Letters standfor. I see that on the FR24 map u can click on or off MLAT traffic??

    Thanks Andrew, i did check for this new feature under settings yesterday but it was not there, MLAT stands for Multilateration
    http://www.multilateration.com/surve...ateration.html
    AMS Daily Fight Information: http://schiphol.dutchplanespotters.nl/

  3. #3
    Purser
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    Speedbird1960:

    Hey thanks, i understand now. Was just a bit curious.

  4. #4
    Administrator Mike's Avatar
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    MLAT stands for Multilateration, which means that we are calculating position of aircraft without ADS-B. MLAT on FR24 is done with the help of our new FR24 receiver, with built in GPS, that we have been offering for free to feeders around the world. In order to make MLAT work, we need 4 receivers covering the same area. By using GPS for time synchronization, we can now calculate the position of aircraft, with just a ModeS transponder, from 4 receivers.

    After almost 12 months of hardware development and 9 months of software development we are now ready to publish a first beta version to show what we have achieved. By comparing ADS-B plots with MLAT plots of the same aircraft we verified that we have reached an accuracy of about 10-100 meters on MLAT calculations.

    We have decided to invite all our premium users (feeders or paid users) to take part in the beta testing if you want. By enabling "MLAT" in settings you can view aircraft with calculated positions on our FR24 map. Today we only have MLAT coverage in parts of Sweden, Poland and Germany. Our next steps will be to improve the quality of MLAT data, improving the stability of the service and fixing all potential bugs. We will at the same time expand our MLAT coverage to other parts of the world with primary focus on Europe and USA where we have most feeders and best coverage.

    During our tests we have seen most of the passenger traffic including CRJ-200, CRJ-700, CRJ-900, Embarer E135, Embraer E170, Dash 8, ATR72, Saab 340, Saab 2000, MD80, Boeing 717 and many, many more. But you have to remember that we need coverage from 4+ receivers in order to calculate positions, and there are today no areas where have coverage below 10.000 feet from 4 receivers. In most areas where we have coverage from 4+ receivers today, it's only on altitudes 20.000 feet and above so don't expect to see any Piper 28 or Cessna 172.

    Help us with coverage!
    If you want to host our ADS-B/MLAT receiver to help us increase coverage please fill out this form.



    Some screenshots


  5. #5
    Purser
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    Mike:

    Sounds really kool this MLAT, you guys are doing a wonderful job on making FR24 the best out there. If you need any help on this side of the pond when the time comes give me a hollar i would be honoured to help out. Remember i am in Canada. So like i said if and when you need help here in North America let me know.

  6. #6
    Purser
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    Mike:

    Maybe you can answer this, i tried to zone in to your area on the FR24 premium map, with MLAT box checked to view them, i couldnt find any saying the radar was MLAT origin, are they yellow icons as well, looks like it as i am viewing you pics above, How can one tell, i clicked on a lot of AC and coulnt find any. Just curious.

  7. #7
    Administrator Mike's Avatar
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    The easiest solution is to set filter on Radar = T-MLAT
    Please note that MLAT planes sometimes loads slower and sometimes just disappear after some minutes, but as I mentioned before, this is just a first beta version.

  8. #8
    Purser
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    Ok will try it out mike. Also i know this is not the right thread to ask, but i posted on the proper thread and have not heard anything. We windows 8 phone users got a small update about a week ago, real small, didnt see much in the update i think all there was was the UTC time was added in the ETA section. Just curious if your programmers are working on anything new to add to the windows 8 phone apps??

    Cheers Andy.

  9. #9
    Captain
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    Shouldn't the Radar code be " F-MLAT " and not " T-MLAT " Since it's coming from the F-xxxx newer hardware receivers.

    ummm.....

  10. #10
    Captain fungus's Avatar
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    Mike,
    For what it's worth by way of feedback, after watching the 'T-MLAT' aircraft for a short while (until they disappeared altogether):

    PRO's
    1) Good coverage.
    2) Good plots.
    3) Great to see some more 'unusual' aircraft (from other parts of the world, I 'see' some of them frequently mode-s only).

    CON's
    1) You need to regularly reload the page when they disappear to get them to re-appear. (As stated by yourself).
    2) Aircraft frequently disappear and for long periods.

    In relation to your comment "But you have to remember that we need coverage from 4+ receivers in order to calculate positions, and there are today no areas where (sic) have coverage below 10.000 feet from 4 receivers." Do you mean in general (with any receivers) or with the new receivers? It seems to be the case here in Sydney (Australia) that we have quite a few more than 4 (older) receivers at present. I'd have thought by now there might even be more of these locations.

    All in all a great start.
    Regards,
    Gregg
    Last edited by fungus; 2013-06-02 at 07:31.

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