Ghost
Bart Senior wrote
Source for next bit was Dutton's.
A ghost image is a false image moving in parallel
of a real object being tracked. They tend to be
more of an arc shape or fuzzy in shape compared
to the sharper image or a real object.
My interpretation based on my radar training.
They are formed by the signal taking a longer
path to the object. Most commonly from a reflection
off some other part of a larger vessel. This could
change the beam shape of the radar. Sometimes
you can get echos off thunderstorms.
This next bit was a joke. An optical coupler can't be shorted out
because it's is a card with holes cut in and and blocks
or passes light to a sensor.
Or perhaps your optical coupler has shorted out. grin
Joe wrote
If you see a ghost on radar are you seeing boobsie?
If not what are you seeing, and how would you define a ghost?
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