Tagged: rtl1090

COAA PlanePlotter Review Part 3

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USAF JUVAT80 (Gulfstream V, 01-0076) - a successful Mlat!
USAF JUVAT80 (Gulfstream V, 01-0076) – a successful Mlat!

Mlat

Assuming you have a fully operational set-up (GS/MU or just MU), you can now manually “Mlat” non ADS-B aircraft. For the most part these will be military assets, though it will become apparent that there are a fair few civil types that don’t transmit positional data too.

PlanePlotter Multilateration Tutorial PDF – How Mlat works

Unless you have read the Help Topics within PlanePlotter or the PDF file above it may not be that obvious what to do now and how Mlat works. Simply put – if a precise distance from an unknown location (position-less aircraft) can be received by 3 known locations (Ground Stations) it is just a matter of using geometry to determine the position of the unknown aircraft. Of course it is way more complicated than this simplified explanation and I recommend reading the PDF file above for a more thorough briefing.

To use the PP Mlat feature go to View… Aircraft list as position-less aircraft obviously do not appear in the chart view until successfully plotted. It is useful to mark additional sub search parameters from the Aircraft list display options notably: Aircraft without positions (shortcut key U) or Aircraft with Mlat possible (shortcut key M) as this will eliminate aircraft that have positions and make it easier to see what is or not plotted.

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COAA PlanePlotter Review Part 2

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Now that everything is working (hopefully!), we can proceed to customising the display.

The majority of the aircraft symbols seen will be yellow, but various colours can be assigned and labels expanded or reduced to individual preference. Additional colours are also used – for example expiring aircraft are orange and Mlat white. You may also  catch an aircraft with blue concentric circles radiating from time to time – these aircraft are squawking ident usually as a result of a squawk change.

POLLY01 (F-16 J-632) squawking ident 3635
POLLY01 (F-16 J-632) squawking ident 3635

To change these parameters we need to open up Chart Options (menu or easier via the spanner symbol). Initially the options seem bewildering, however its all quite straightforward, nevertheless I’d recommend changing a few things at a time and re-checking the display to see if its appropriate to your needs.

I've complied a sort of time lapse graphic here that illustrates colour changes as RYR96YE climbs to altitude (note nose colour cyan). In addition the aircraft data labels show what you can do by adjusting the Label settings under Chart Options...
I’ve complied a sort of time lapse graphic here that illustrates colour changes as RYR96YE climbs to altitude (note nose colour cyan). In addition the aircraft data labels show what you can do by adjusting the Label settings under Chart Options…

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COAA PlanePlotter Review Part 1

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At the heart of the PlanePlotter system is Mlat. Here a USAF E-3C (SHUCK80H) is being successfully Mlated (manually by me - the blue lines are hyper curves used during the process). Note also the KC-135R (QID81) and MC-130J (LEGIT41)
At the heart of the PlanePlotter system is Mlat. Here a USAF E-3C (SHUCK80H) is being successfully Mlated (manually by me – the blue lines are hyper curves used during the process). Note also the KC-135R (QID81) and MC-130J (LEGIT41)

PlanePlotter Version Reviewed: 6.4.1.0-6.4.1.2 (GS/MU rN)

As an aviation enthusiast of many a decade I can tell you that this sort of hobby evolves over the years. Back in the 1980′s the only tools I had were a pair of binoculars, a copy of Ian Allan’s abc Military Aircraft Markings, a note book and pencil. As time went on I added a 35mm SLR (remember those?) and a collection of high powered lenses. The 90′s saw the addition of my first scanner plus a spotting scope for good measure. I was pretty much sorted – not much got past me at my local airfield.

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SDR Software (Free Stuff!)

Check out the Realtek RTL2832U+R820T USB SDR at Amazon.co.uk

So you are in receipt of a shiny new Realtek RTL2832U+R820T SDR dongle and I understand the first thing you want to do is start decoding ADS-B, ACARS or some other exotic data format. Maybe you just want to listen in to some local comms? Well we really need to get some software loaded up.

There are two popular SDR tuning programs and both are freeware: SDR# (SDRSharp) and HDSDR. I’ve tried both, but highly recommend SDR# as its more user friendly – especially for newcomers so we’ll stick with that.

SDR# (SDRSharp)

There are numerous SDR# versions available (stable/nightly builds) and a degree of experimentation is required to get the program up and running. Installation worked flawlessly on one PC but was a total nightmare on another. Eventually I got it working on both (funnily identical Windows XP platforms!). SDR# requires .NET Framework to be installed prior to running and the problems I had installing SDR# on my laptop was because I had 4.5 installed and not 3.5. To be on the safe side I ended up installing .NET Framework versions 1.0, 2.0, 3.5 and 4.5 (overkill or what?!).

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