Perhaps it has to do with the geometry of nearby stations.
Very few of these attempts result in a position fix. When the program is idle and detects a positionless aircraft (transponder S-Mode without ADS-B data) with enough other stations reporting, the program tries to run the MLAT routine by setting up direct UDP connections to nearby stations and exchanging timing information. I have auto-MLAT TDOA positioning enabled. I don't think the increase is "real" but just a scale shift as to what is reported by the decoder. The relative signal strengths increase dramatically across the board, but there is no change in coverage as long as I set the gain to maximum (which the AGC is likely doing anyway). I tried turning off the two AGCs on the dongle. The signal strength indication (0% to 100%) now shows as the last two digits of each plane's descriptor on the display, so you can check yourself. However, I was able to continue tracking most planes directly out to 150 to 175 nm. In all cases the signal strengths peaked as the planes flew overhead and diminished rather quickly as they moved on. Refresh your browser if the image is missing or incomplete because it was updating during the browser automatic refresh.ĭon, since the RTL1090 decoder program and PlanePlotter support relative signal strength indications, I turned them on and observed a few overhead flights. Small white triangles are station locations or navaids (NDBs or VORs), depending on how I have the display set at the moment.
Larger airports show the airspace range rings surrounding them. Planes marked by a white diamond are those located by TDOA techniques (currently a manually-initiated process).Īirports are in red. Planes with blue text are from shared data with other stations in the network. Plane locations with yellow text are those being received directly by my antenna and receiver system. The display shows range rings centered on my location. The image size and detail reflects whatever zoom level and details I have enabled at the moment.
Tracking a plane with blocked tail number by planeplotter update#
I currently have it set to update every 30 seconds. I have an experimental web page set up that shows a real-time image of my PlanePlotter ATC display.
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