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Thread: MLAT is now live on Flightradar24

  1. #411
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    Quote Originally Posted by Oblivian View Post
    It was like that here for a while. And mlat was far and few. Then a couple appeared some 200nm away off to one side and it was all on. When aligned the opposite axis location is hard to distinguish and can make incorrect zig-zag patterns.
    ....
    I made a map with the flight paths and (planned) FR24 receivers.

    Oblivian, so if i understand you correct in the current setup MLAT results would be next to none for approaches into the airport where receiver 3 is located?

    Click to enlarge

  2. #412
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    The areas to the left might be OK with the 3 in a row.

    Here the paths ran N/S nearly over top of them. So one to the other side of the tracks made it all happen.

    Where the 2 outters are (4 and the planned) should cover it nicely I'd imagine. But it may have results off to the left with the separation they have now. If it was further to the north/south it may strike issues if you catch my drift

    For example. If you have 3 in a row, and want to calculate the position (Red) and there is a short length of variance. How do you know which side (blue dots) the W/E loctation is.

    However if the station off to the right (circled) was in action, It could fill the missing part of the equation

    mlatlayout.jpg
    Posts not to be taken as official support representation - Just a helpful uploader who tinkers

  3. #413
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    Thanks for the explanation. It confirmed my suspicion that 3 in a row could be problematic.

    The red dot on the right is the legend :P
    Receiver 1 and Receiver 2 are live at the moment and Receiver 3 and Receiver 4 are planned. Receiver 3 located is at the airport to have ground coverage.

    Problem is that the FR24 receivers from Guyana and French-Guiana have a very limited range of around 150 NM and do not cover Suriname. A receiver to the east near the border with French-Guiana can reach the border with Guyana if located strategical thus providing 5 receivers available for MLAT. In an ideal situation that could probably cover Suriname and French-Guiana with MLAT
    Best would be to have a receiver in the south but that is next to impossible to achieve.

  4. #414
    Team FR24 Olov's Avatar
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    Quote Originally Posted by GitseBase View Post
    Thanks for the explanation. It confirmed my suspicion that 3 in a row could be problematic.

    The red dot on the right is the legend :P
    Receiver 1 and Receiver 2 are live at the moment and Receiver 3 and Receiver 4 are planned. Receiver 3 located is at the airport to have ground coverage.

    Problem is that the FR24 receivers from Guyana and French-Guiana have a very limited range of around 150 NM and do not cover Suriname. A receiver to the east near the border with French-Guiana can reach the border with Guyana if located strategical thus providing 5 receivers available for MLAT. In an ideal situation that could probably cover Suriname and French-Guiana with MLAT
    Best would be to have a receiver in the south but that is next to impossible to achieve.

    https://www.dropbox.com/s/dhnmmwe0nm...02.25.png?dl=0

    Three (!) receivers in French Guiana with very very limited coverage, didnt even enable coverage data on the screenshot because it was so little. A few nm.

    Suriname receivers pretty good, both covering almost the whole country to the south. And 200nm out in the ocean.

    Guyana receiver only covers roughly 50nm in all directions.

    To get stable MLAT in the area we would need a bunch more receivers, or get better performance from the ones we have. If anyone is up for it, let me know!

    *Edit: We have one new receiver shipping to Suriname at the moment, location will be in Zanderij. Looks like a really good location, fingers crossed!

  5. #415
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    Quote Originally Posted by Olov View Post
    https://www.dropbox.com/s/dhnmmwe0nm...02.25.png?dl=0

    *Edit: We have one new receiver shipping to Suriname at the moment, location will be in Zanderij. Looks like a really good location, fingers crossed!
    Receiver at Zanderij (Airport) is installed as of today
    Now we can see ground traffic.


    Problem with (French)Guyana is that the receivers are there, but that they probably need to be placed higher.
    The feeder from Guyana isn't active on the forum and there is no means of contacting him or the feeders from French-Guiana.

    I'll check if there are people near the border with a tower where an antenna can be placed.

  6. #416
    Team FR24 Olov's Avatar
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    Quote Originally Posted by GitseBase View Post
    Receiver at Zanderij (Airport) is installed as of today
    Now we can see ground traffic.


    Problem with (French)Guyana is that the receivers are there, but that they probably need to be placed higher.
    The feeder from Guyana isn't active on the forum and there is no means of contacting him or the feeders from French-Guiana.

    I'll check if there are people near the border with a tower where an antenna can be placed.
    Good results from Zanderij indeed.

    Let me know if you find good locations in the area, I would be willing to relocate receivers with poor performance.

  7. #417
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    That 3 in a row is not the perfect setup, but the new one in SMNI could change the situation, right?

  8. #418
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    Today I noticed a lot of traffic attributed to T-MLAT radar that is not (or should not be?) MLAT, e.g. that I see on my own receiver with proper non-MLAT positions.
    Sometimes they switch back and forth between an N, F or regular T feeder and T-MLAT. I see this above the Netherlands, but it looks the same in other areas as well.
    Is this normal, because I don't remember it was like this before?
    T-EHLW33

  9. #419
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    Nevermind, everything is back to normal, no more T-MLAT on almost everything
    T-EHLW33

  10. #420
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    Quote Originally Posted by Windsurfmaniac View Post
    That 3 in a row is not the perfect setup, but the new one in SMNI could change the situation, right?
    The 3 (in a row) have great range so it will all depend upon the quality of the SMNI receiver if we can achieve MLAT on FR24.

    Finding someone to put up a receiver is not a big problem, but to increase the range you need to be willing to spend some bucks.
    I have a pole construction that is 10 m (33 ft) high and the plan to increase it by another 1.7 m is in the making.

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