AirNav Systems Forum
AirNav RadarBox and RadarBox24.com => AirNav RadarBox and RadarBox24.com Discussion => Topic started by: Dana on March 22, 2012, 11:24:10 AM
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For some time I noticed that time to time the airplanes are” jumping”on the map and then came back in the initial position after a few sec. Anyone experienced anything like that ? I am using a GP1090 antenna outside 17 m height , 8 m of Ecoflex 10 , very good range 200 to 230 NM all directions, no obstacles around. I attached a map as example …I am curious to know if someone experienced something similar situation and which can be the reason of this ?
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I can monitor similar effects, especially on the edge of reception range.
In each ADS-B is a section for error detection, but it's possible that this detection mechanism is true, although decoding errors have occurred while receiving the message. This happens, if the message(s) are scrambled in a way that the plausibility check is still true, so the message is marked "valid" and is processed. It's a known issue of plausibility checks and error detections, that aren't using very complex algorithms.
Weak signals on the edge of reception range and/or broken, damaged transponders increase the possibility of such decoding errors, resulting in "airframe jumps".
Further there might be a bug, a glitch or bad programming in the software, which is responsible for this kind of in-precise handling in cases of "edge receiving".
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Thank you very much for your response and for your time as well :) !
All the best, schönen tag!