Airplane Scatter
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This screenshot was made at 21:12
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The green line indicates the path from my QTH to Tx site
Its midpoint is in the area of Halle Plane C is just crossing the path at midpoint. In the above waterfall trace C is just at carrier frequency (no doppler shift). Plane A (travel path marked pink-blue) approached midpoint much slower, and thus doppler shift was smaller, but the trace in the waterfall was much longer visible. Plane B arrived from the east and is now west of the path, the resulting reflection path length continuously increases, and thus its frequency affected by doppler shift gets lower and lower Note: The waterfall does not give a clue whether a plane flies east-to-west or west-to-east. It only tells if it is approaching the path (when the Doppler shift is positive) or leaving it |
Aircraft scatter
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Doppler Radar
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