MLAT ground stations receive replies from all transponder-equipped aircraft, including legacy radar and ADS-B avionics, and determine aircraft position based on the time difference of arrival (TDOA) of the replies. Previously, there was no way to follow a Beamfinder fix on the chart with an Mlat fix. Ctrl-Shift click on a Beamfinder target on the chart can now be used to initiate an Mlat.
#Planeplotter with mlat update
Time Difference of Arrival (TDOA) Processing In addition, Planeplotter users must now update as soon as possible and authenticate their copy. A screen displaying multilateration information can be set to update as fast as every second, compared with the 4 - 12 second position “jumps” of the radar-derived targets.ģ. Furthermore, while the radar and multilateration “targets” on a controller’s screen are identical in appearance, the very high update rate of the multilateration-derived targets makes them instantly recognizable by their smooth movement across the screen. Multilateration requires no additional avionics equipment, as it uses replies from Mode A, C and S transponders, as well as military IFF and ADS-B transponders. The worlds largest co-op of ADS-B/Mode S/MLAT feeders, and the worlds largest public source of unfiltered flight data.
Using advanced computer processing techniques, these individual time differences allow an aircraft’s position to be precisely calculated. Since individual aircraft will be at different distances from each of the ground stations, their replies will be received by each station at fractionally different times. Been a while since I saw both the Orion serials active at the same time, noted them recently on alternative days but today both are active.
These units listen for “replies,” typically to interrogation signals transmitted from a local SSR or a multilateration station. I have changed the aircraft tags to blue on planeplotter - much better for me. Multilateration employs a number of ground stations, which are placed in strategic locations around an airport, its local terminal area or a wider area that covers the larger surrounding airspace. It was developed for military purposes to accurately locate aircraft - many of which did not wish to be “seen” - by using a method known as Time Difference of Arrival (TDOA). Multilateration is a proven technology that has been in use for many decades.
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