PLANEPLOTTER WITH MLAT SOFTWARE
one PC with software to display the data. However, more then 100 km are no problem, even with simple This requires a sensitiveĪntenna-receiver-combination and will be difficult to realize in the To receive signals from this aircraft.Signals from an aircraft flyingĪt 30000 ft altitude (10 km) can be received (at least in theory) overĪ distance from up to 400 km. As higher the aircraft altitude as larger the maximum distance Aircraft at a large distanceĪre beyond and below the horizon and consequently obscured by theĮarth. The greatest obstacle for radio waves on our planet is the earth Roof or at a high post would be ideal, but for the first tries a Position with an undisturbed view in all directions. The receive antenna should be mounted at a high There is no disturbing object in the line of view between aircraft and Linear through the atmosphere and are not reflected by the upperĪtmospheric layers (ionosphere). Receive this transmissions one needs a receiver for this frequency - anġ090 MHz is a frequency inside the L-band. (Automatic Dependent Surveillance–Broadcast)Īll aircraft transponders transmit data at the frequency 1090 MHz. Why should somebody do this? Because it's fun. Thus the virtual radar gives you a good idea about the air Picture with the position (and additional information) of all EverybodyĬan receive this squitter-information and create an own virtual radar (receiver-transmitter, called transponder) and if this transponder isĪ secondary radar ground station is much cheaper then a real radar.Īnother feature is, that the answering aircraft can insert additionalįor several years a new generation of transponders is in use, they Works only, if the aircraft has the necessary hardware Time delay from interrogation to the answer, then it can predictĭirection and range to the aircraft - like a real radar. If the ground station employs a directional antenna and measures the In the aircraft answers by sending a replay back to the ground station. Interrogation to a special receiver inside the aircraft, a transmitter 
A ground station (interrogator) transmits an Large areas of the US-airspace are not covered by radar.
Transponders of threes aircraft had been switched off.
Software with PIC18F2550 back to my projects, PIC-Microcontrollers, Electronic, Homepageĭo you remember the 11st September 2001 ? In the USA some aircraftĭisappeared from the screens of the air traffic controllers (ATC).
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