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Thread: Archived - Beta test MLAT software for Raspberry Pi

  1. #361
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    Quote Originally Posted by Cooler View Post
    I like to setup different Raspberry pi's in this region to see all the General Aviation flying around here using the mlat capabilities of FR24, also at low altitude's.
    On the forum I read a lot about this topic and so far I understood a non ADS-B plane should be seen by minimal one FR24 (F) feeder and three Raspberry pies. They all should see an ADS-B plane as reference.
    In this region I see local mlat planes above 3000ft. At lower altitudes they disappear. During the same flight of those local planes, I see the radar changing from mlat into T-feeders. The T-feeders are all the time of the same four feeders. If the radar is changing from mlat to a T-feeder the plane is jumping to another position (1-2 km) So it's not very accurate.
    Last week I set up my first pi and it's running well.

    My question is: Will a Radarcape receiver be seen as a F-feeder from FR24? So if I use that feeder together with some Rasberry Pi's in the region will I see alle the planes at low altitude?
    1) If you bought your own radarcape it will be assigned a T-feeder code.

    2) Yes, theoretically you are correct. It depends on how you cover the area with the receivers, the bigger the better. If I recall correctly each receiver should be about 50nm away from each other in a square pattern; but in real life that is quite a challenge to achieve. FR24 also did mention they normally need at least 6 FR24 receivers to get MLAT to work. And how well the dongle RPi MLAT software setup is contributing we don't really know for now. There has been some MLAT7s popping up (meaning from the rpi mlat software) and some has been quite 'wild'. It is still in the testing phase however.

  2. #362
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    Quote Originally Posted by Cooler View Post
    My question is: Will a Radarcape receiver be seen as a F-feeder from FR24? So if I use that feeder together with some Rasberry Pi's in the region will I see alle the planes at low altitude?
    The quiestion is rather; Will FR24 treat the Radarcape as a FR24 supplied F-feeder?. You will have to ask support@fr24.com for a definitive answer.

    A further requirement is that the aircraft needs to be seen and interrogated by a secondary surveillance radar (SSR) or another aircraft equiped with ACARS in order for the transponder to transmit data. So to be sure the aircraft is tracked at low level you need line of sight from a radar site or steady traffic overhead

  3. #363
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    Quote Originally Posted by Kpin View Post
    The quiestion is rather; Will FR24 treat the Radarcape as a FR24 supplied F-feeder?. You will have to ask support@fr24.com for a definitive answer.

    A further requirement is that the aircraft needs to be seen and interrogated by a secondary surveillance radar (SSR) or another aircraft equiped with ACARS in order for the transponder to transmit data. So to be sure the aircraft is tracked at low level you need line of sight from a radar site or steady traffic overhead
    I life in the the eastern side of the Netherlands. There is a lot of traffic overhere. Why are the ACARS planes needed for mlat?

  4. #364
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    So is the general consensus to run D1090-MR FR24feed and then tap into the raw for other apps. As apposed to 2 separate instances on the 1 device of D1090(in say piaware) and D190MR in FR24feed package.

    Shame, fired it all up. Turns out theres not enough Pi users near me :/

    But once I get a 2nd antenna/combo going or a pigtail to attach it to the DPD that may well change.

  5. #365
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    Quote Originally Posted by Oblivian View Post
    So is the general consensus to run D1090-MR FR24feed and then tap into the raw for other apps. As apposed to 2 separate instances on the 1 device of D1090(in say piaware) and D190MR in FR24feed package.

    Shame, fired it all up. Turns out theres not enough Pi users near me :/

    But once I get a 2nd antenna/combo going or a pigtail to attach it to the DPD that may well change.
    As for FR24 I assume you don't need other Pi users nearby. You can be the one RPi in a cluster of 3 FR24 F-feeders + you; or 2xF + 2xT(RPi). And as there are quite a few F-feeders around Christchurch, you might be able to lower the MLAT altitude a bit. Maybe ...

  6. #366
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    Quote Originally Posted by Oblivian View Post
    So is the general consensus to run D1090-MR FR24feed and then tap into the raw for other apps. As apposed to 2 separate instances on the 1 device of D1090(in say piaware) and D190MR in FR24feed package.
    Nope :-)

    install dump1090-mutability, install FR24 and connect via AVR (TCP) on 127.0.0.1:30002, then install piaware and it works out for itself that dump1090 already exists.

    thats how I'm running it here..... (just remember to do the setting to stop the FA produced MLAT getting sent to FR)
    T-YSBK22

  7. #367
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    Quote Originally Posted by rodeo View Post
    Nope :-)

    install dump1090-mutability, install FR24 and connect via AVR (TCP) on 127.0.0.1:30002, then install piaware and it works out for itself that dump1090 already exists.

    thats how I'm running it here..... (just remember to do the setting to stop the FA produced MLAT getting sent to FR)
    Already applied the fix, Awaiting 2nd test ID from FR to not mess my normal stats up

    Ill go down the -MR road now then. Does mean I can't do the FR MLAT as well though wont it for now. Needs direct USB access and all that

  8. #368
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    Hello all again, while my PI feed worked for last month without problems, it now stopped working for unknown reasons.
    First it shown this: -- notice the Timestamp error.

    pi@raspberrypi ~ $ sudo service fr24feed status
    [ ok ] FR24 Feeder/Decoder Process: running.
    [ ok ] FR24 Stats Timestamp: 1970-01-10 08:30:15.
    [FAIL] FR24 Link: unknown ... failed!
    [ ok ] Receiver: connected (2604879 MSGS/0 SYNC).
    [FAIL] FR24 MLAT: not running ... failed!

    Then I tried to manually fix the system time by using
    sudo date -s "23 SEP 2015 17:19"
    and it corrected the date on the PI itself, but now even after restarting the fr24feed service, it gives me this

    pi@raspberrypi ~ $ sudo service fr24feed status
    [ ok ] FR24 Feeder/Decoder Process: running.
    [ ok ] FR24 Stats Timestamp: 2015-09-23 17:17:57.
    [FAIL] FR24 Link: unknown ... failed!
    [ ok ] Receiver: connected (10313 MSGS/0 SYNC).
    [FAIL] FR24 MLAT: not running ... failed!

    And it's still not working. Please help. Maybe I should update the feed, but don't know how to really do that..

  9. #369
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    Quote Originally Posted by cbgsy View Post
    I've just seen another example of this with flight GR679 from Manchester to Guernsey which is operated by G-VZON, an ATR-72 - definitely MLAT only.

    T-EGHI62
    Perhaps we should start a name and shame thread?
    Name and shame is a bit drastic, but I'll happily out myself.

    Edit: Reading further it seems there a "setting" to stop this. I'll post back if I can work out what that is before you reply!

    Can you tell me what you think I've done wrong with my setup that is causing a problem? Unfortunately I've done some work on it, so the setup isn't the same as when you posted. I'm on Linux Mint 17.2 (effectively Ubuntu) with a generic Rafael Micro R820T tuner. At the time I would have been using the FlightRadar dump1090 setup, and feeding piaware from there to share the data with FlightAware.

    I'm now on dump1090-mutability v1.15~dev and PiAware (Debian Package Add-on) 2.1-3~dev. Nearest airport is EGHI / SOU. I live a couple of miles to the west of it, but don't have line of sight.

    Something I had been noticing was that planes coming in to land from the north seemed to get to within a mile or so and then circle round and stop about 10 miles to the north of the airport. Obviously this wasn't actually happening, and they were landing and then I was getting bad data from somewhere.
    Screenshot from 2015-09-23 21:54:56.png

    I notice that the FlightRadar website has the wrong coordinates for me (they have used the airport itself), and they seem to override the locally (correct) set ones.

    Any suggestions what I should be looking for in my setup to see how I'm feeding FR from FA?
    Last edited by fr241a; 2015-09-23 at 20:58.

  10. #370
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    @ dakky
    Don't know your network-configuration but I had simmilar errors. (Not the timestamp error thou)
    I checked my network connections and detached and re-attached the UTP-cable. Then re-signed-up again. After that it worked fine again....
    ___________

    Another general question... what's the difference between F-feeders and T-feeders??
    Last edited by peerke63; 2015-09-24 at 00:20. Reason: adressing

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