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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Tue Mar 08, 2016 1:34 pm 
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jonhawkes2030 - FlightAware user avatar

Joined: Tue Jan 05, 2016 4:15 pm
Posts: 1064
Location: NYC
dump1090 uses Mode S messages to get timing information. It uses this to triangulate positions of Mode S aircraft.
If the information is not accurate or reliable, it cannot be used.
Do you have anything else running on the RPI? Is it a version one or two?


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Tue Mar 08, 2016 1:42 pm 
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TipekUsair - FlightAware user avatar

Joined: Thu Apr 29, 2010 7:00 pm
Posts: 31
My RPI is version two. The only other thing that is running on my Pi is PF feed.

3655 pi 20 0 15788 6060 908 R 34.7 1.4 35:16.54 dump1090
3665 pi 20 0 75776 32m 5424 S 33.7 7.3 34:06.73 node
2132 root 20 0 11232 6812 2476 S 21.3 1.5 285:17.04 fa-mlat-client
3659 root 20 0 2352 708 596 S 2.9 0.2 3:01.98 nc
2025 root 20 0 17348 6484 3004 S 2.2 1.4 27:27.47 piaware
3660 root 20 0 2404 808 672 S 1.3 0.2 1:41.75 nc

FA MLAT client runs around 20% of the CPU


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Mar 26, 2016 9:13 pm 
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davidgoe - FlightAware user avatar

Joined: Thu Oct 15, 2015 8:53 pm
Posts: 22
jonhawkes2030 wrote:
obj wrote:
jonhawkes2030 wrote:
Mode C send pressure altitude(29.92" or 101.3mb. The ground stations correct this). Not 100% sure about S/ES. I have seen ES messages that state it is pressure or geodetic (GNSS) altitudes.

Regular Mode S altitudes are the same as mode C, the pressure altitude.

The primary altitude in ADS-B / ES is usually pressure altitude, but it also transmits the difference between the pressure altitude and GNSS height-above-ellipsoid in a separate field. (If pressure altitude is unavailable for some reason, HAE may be sent directly, but that is uncommon)

The pressure altitude is one of the inputs to the multilateration solver and it is heavily biased to produce a result that is close to the transmitted altitude. If mlat does not have a pressure altitude, though (e.g. the transponder is not being interrogated by a SSR or we're not hearing the replies) then it will try to solve for the altitude directly. The results are not very reliable in that case (the altitude solutions are very sensitive to small errors because the receivers and the aircraft are roughly in the same geometric plane)



I had forgotten that we fly by pressure altitude. It makes sense that it is what the transponder reports.
We just change to 29.92/1013 when we get to the flight levels (around class A airspace in the US and Australia) so we don't need to change it until we descend. Otherwise a fast aircraft would be changing it too often.


Thanks for the detailed replies. In summary then, if I understand correctly, for MLAT we usually have a non-corrected pressure altitude and that is displayed, otherwise an extremely noisy attempt is made to compute it. However it seems there is no way for me to know which was done. I get I could look for non-smooth changes which would indicated a computed result.

In any case it looks like I still have to do the altitude compensation based on the actual current atmospheric pressure myself.


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Thu Apr 14, 2016 6:48 pm 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
Any chance of getting a FlightAware feeder with MLAT for x86 or x64 based PCs? Even the first gen Intel sticks run circles around the newest RPi in the way of memory and horsepower.


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Thu Apr 14, 2016 7:00 pm 
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jonhawkes2030 - FlightAware user avatar

Joined: Tue Jan 05, 2016 4:15 pm
Posts: 1064
Location: NYC
Have you tried compiling it?

I did this for the dev 3.0 version
(remove the "-b dev" for the current version).

sudo apt-get install build-essential debhelper tcl8.5-dev autoconf python3-dev python-virtualenv libz-dev tcl8.6-dev python3-venv dh-systemd
(There may be other dependencies. Just add them too).

git clone https://github.com/flightaware/piaware_builder.git -b dev
cd piaware_builder
./sensible-build.sh jessie

cd package-jessie
sudo dpkg-buildpackage -b
cd ..
sudo dpkg -i piaware_3.0~dev_armhf.deb (Change to whatever it creates)


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Fri Apr 15, 2016 1:27 pm 
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wileytom - FlightAware user avatar

Joined: Fri Jan 25, 2008 2:00 pm
Posts: 2
N456TS wrote:
joma wrote:
Unfortunately most of the GA in my position do not have mode S transponders, only mode C.


Only 4 more years until most do, or have UAT. Both can be picked up here provided you have the right setup.



Not in Alaska where I live! ADS-B will not effect most of the State, only the Class Charlie airspace in Anchorage and Fairbanks. We have more aircraft than all other States combined, but most will not be converting.


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Fri Apr 15, 2016 6:54 pm 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
jonhawkes2030 wrote:
Have you tried compiling it?

I did this for the dev 3.0 version
(remove the "-b dev" for the current version).

sudo apt-get install build-essential debhelper tcl8.5-dev autoconf python3-dev python-virtualenv libz-dev tcl8.6-dev python3-venv dh-systemd
(There may be other dependencies. Just add them too).

git clone https://github.com/flightaware/piaware_builder.git -b dev
cd piaware_builder
./sensible-build.sh jessie

cd package-jessie
sudo dpkg-buildpackage -b
cd ..
sudo dpkg -i piaware_3.0~dev_armhf.deb (Change to whatever it creates)


I am already running Ubuntu and Dump1090 on this stick. It seems I remember trying to install some packages from a script and got errors alluding to the package only being compatible with Arm.

At this point, with Dump1090 running normally on Ubuntu on this x64 device, can I now install some form of PiAware that is not locked to Arm processors or is that not relevant?


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Fri Apr 15, 2016 6:57 pm 
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obj - FlightAware user avatar

Joined: Tue Sep 30, 2014 7:14 pm
Posts: 3550
There's nothing arm-specific in piaware.
(the binary packages provided by FlightAware are only built for arm, but if you're building it yourself that doesn't matter)


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Fri Apr 15, 2016 7:15 pm 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
obj wrote:
There's nothing arm-specific in piaware.
(the binary packages provided by FlightAware are only built for arm, but if you're building it yourself that doesn't matter)

Perfect. SO, what I'm looking for is some assistance in the way of a more detailed procedure to install said hardware agnostic PiAware package onto this stick. Not very Linuxy here.


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 3:45 am 
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obj - FlightAware user avatar

Joined: Tue Sep 30, 2014 7:14 pm
Posts: 3550
There are instructions for building it in Jon's post


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 9:51 am 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
obj wrote:
There are instructions for building it in Jon's post



Still no working PiAware. Lots of errors. Dump1090 works.

Seems to be a problem with finding python3-venv

found something on the web about changing it to python3.4-venv Did that, installed, but the builder still looks for python3-venv and fails..

Help?


Last edited by k5ted on Sat Apr 16, 2016 10:32 am, edited 1 time in total.

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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 10:15 am 
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obj - FlightAware user avatar

Joined: Tue Sep 30, 2014 7:14 pm
Posts: 3550
You're not giving us enough information on what's going wrong for anyone to help.


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 10:33 am 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
obj wrote:
You're not giving us enough information on what's going wrong for anyone to help.


the thing that keeps failing and retries 5 times is the python3-venv


ted@tedsb:~/piaware_builder$ cd package-jessie
ted@tedsb:~/piaware_builder/package-jessie$ sudo dpkg-buildpackage -b
dpkg-buildpackage: source package piaware
dpkg-buildpackage: source version 3.0~dev
dpkg-buildpackage: source distribution UNRELEASED
dpkg-buildpackage: source changed by Oliver Jowett <oliver@mutability.co.uk>
dpkg-buildpackage: host architecture amd64
dpkg-source --before-build package-jessie
dpkg-checkbuilddeps: Unmet build dependencies: python3-venv
dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting
dpkg-buildpackage: warning: (Use -d flag to override.)
ted@tedsb:~/piaware_builder/package-jessie$


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 10:45 am 
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obj - FlightAware user avatar

Joined: Tue Sep 30, 2014 7:14 pm
Posts: 3550
OK. This is saying that the python3-venv package is needed to build the piaware package, but it is not installed.

You should be able to install it by "sudo apt-get install python3-venv".


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 1:27 pm 
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toverfield - FlightAware user avatar

Joined: Fri Jun 03, 2011 5:30 pm
Posts: 82
Location: Lake Travis, TX
wileytom wrote:
We [Alaska] have more aircraft than all other States combined, ...

Something is wrong here. Alaska ranks no better than sixth in the number of registered aircraft.

Maybe you mean:
per capita?
unregistered?
transponder-less?
float-planes?


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 2:38 pm 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
obj wrote:
OK. This is saying that the python3-venv package is needed to build the piaware package, but it is not installed.

You should be able to install it by "sudo apt-get install python3-venv".


I get this:

$ apt-get install python3-venv

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python3-venv


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 3:10 pm 
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jonhawkes2030 - FlightAware user avatar

Joined: Tue Jan 05, 2016 4:15 pm
Posts: 1064
Location: NYC
Have a look at this
http://stackoverflow.com/questions/3427 ... linux-mint


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat Apr 16, 2016 4:00 pm 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
jonhawkes2030 wrote:


I found that earlier, and installed fine, but the PiAware builder seems to be asking for the unavailable version, and I'm not sure how to modify and run that.

also getting this error:

sudo apt-get install libz-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'zlib1g-dev' instead of 'libz-dev'
zlib1g-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sun Apr 17, 2016 12:46 pm 
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k5ted - FlightAware user avatar

Joined: Thu Dec 31, 2015 11:07 am
Posts: 188
This method seems to have worked. Still not showing MLAT on dump1090-mut ver 1.5 dev, but planes with position show up, and at least the PiAware seems to be feeding, and shows MLAT enabled for site 22047

https://www.swiftbyte.com/articles/soft ... -or-debian


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 Post subject:
PostPosted: Sun Apr 24, 2016 11:12 am 
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LudgerBoergerding - FlightAware user avatar

Joined: Tue Mar 24, 2015 8:33 am
Posts: 53
I don't know if someone already asked about filtering VIP aircraft's. Today I did not see any mlat positions of the Air Force One here in Germany. I registered about 14000 Mode S signals in 30 minutes and saw the AF1 above my head.

Is there something filtered?


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sun Apr 24, 2016 1:41 pm 
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BartJr - FlightAware user avatar

Joined: Sat Jan 16, 2016 9:11 am
Posts: 142
Location: Austin, TX
I asked the same question here. When the president visited Austin recently I could not get an MLAT fix & another local user also reported no MLAT on AF1 that day.

However, other users have received MLAT on the same aircraft many other times. So I have no idea why sometimes it seems un-mlat-able!


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Wed Apr 27, 2016 12:48 pm 
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wileytom - FlightAware user avatar

Joined: Fri Jan 25, 2008 2:00 pm
Posts: 2
toverfield wrote:
wileytom wrote:
We [Alaska] have more aircraft than all other States combined, ...

Something is wrong here. Alaska ranks no better than sixth in the number of registered aircraft.

Maybe you mean:
per capita?
unregistered?
transponder-less?
float-planes?


Alaska has six times as many pilots per capita and 16 times as many aircraft per capita when compared to the rest of the United States. (1 in 400 vs 1 in 60 pilots per capita) It's lower in the city of Anchorage and higher in the smaller towns and villages, some are 1 in 10. If they're not registered it makes it hard to count them! Transponder-less, absolutely we have many that use 978 UAT only.

Float planes?, I have no idea, but we have many just here at Lake Hood where I park, over 780 aircraft total. Merrill Field in town has over 844 aircraft and only 91 aircraft based at the very busy Ted Stevens International airport. I would say it's more important where aircraft are based or operated than where they're registered.

More statistics here: http://www.aircraftone.com/aircraft/reg ... pcodes.asp


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat May 14, 2016 4:34 am 
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hsran - FlightAware user avatar

Joined: Thu May 21, 2015 2:29 pm
Posts: 62
Can a PiAware sync with a MLAT enabled Flightfeeder ?


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Sat May 14, 2016 4:53 am 
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obj - FlightAware user avatar

Joined: Tue Sep 30, 2014 7:14 pm
Posts: 3550
hsran wrote:
Can a PiAware sync with a MLAT enabled Flightfeeder ?

Yes


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 Post subject: Re: Multilateration (MLAT) now available on PiAware!
PostPosted: Wed Aug 24, 2016 1:52 pm 
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NL3EHV - FlightAware user avatar

Joined: Mon Aug 15, 2016 6:31 am
Posts: 3
Location: Near Eindhoven - Netherlands
Disable --Mode-AC
in dump1090-mutability (/etc/default/)
Reboot dump, that did the magic here..
From 42% CPU to 29-32%
Than i enable mlat, still 32%
Try it..

(# Additional options that are passed to the Daemon.
EXTRA_ARGS="--metric --net --net-http-port 8080")





RPi B+ 600MHz (under clocked)
88.159.160.147:8080


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