You can beat a radar ticket but not using these arguments. Check out the following site on how to protect yourself from capricious police behavior: www.highwayrobbery.net.
Radar and LIdar speeding cases can be fought and won on a variety of defenses. You should consult a local attorney specializing in traffic ticket defense who can better explain the defenses as they relate to your particular situation.
Radar tickets can be fought regardless of the officer's position. There are a various defenses and you should speak with a few traffic attorneys in your area to get an idea of what arguments can be used in your case.