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This Concept Map, created with IHMC CmapTools, has information related to: RADAR Contamination, Anomalous propogation (AP) is an Erroneous Meterological Echo, Trapping special case is Ducting, Ground Clutter occurs when beam strikes large moving objects, RADAR picks up EM wave it didn't send eg Strong RADAR, same frequency, Ducting results in radar reporting echo at higher than actual altitude, RADAR Contamination major types are Anomalous propogation (AP), Superrefraction results in up to 2x normal RADAR distance, Ground Clutter occurs when beam strikes fixed object, Superrefraction results in radar reporting echo at higher than actual altitude, ranges may be near the antenna, exaggerated non-meterological echos produced because solid objects produce more energy, Anomalous propogation (AP) caused by Atmospheric refraction, Ground Clutter causes non-meterological echo, Anomalous propogation (AP) when atmosphere bends beam back into earth, beam strikes large moving objects eg: large swarm 'of insects, Ducting results in up to 5x normal RADAR distance, Ground Clutter occurs at ranges, Atmospheric refraction types are Trapping, Ground Clutter appears as exaggerated non-meterological echos, RADAR Contamination major types are Ground Clutter