Ted, it's all about $$$'s.
Get a lawyer and he can probably get the charge reduced, depending on your driving record.
IMHO you don't want to go to court and try to be Perry Mason. It will turn out to be a he said, she said, type of deal and the cop will win. After all, he's a trained professional.
In traffic court the judge is interested in convictions (it really isn't important what the charge is), $$$'s, and moving on to the next case.
Of course you can try and make a federal case out of it, show how incompetent the cop is, how the equipment fails to work properly, the circumstances of how it was impossible for the cop to isolate you from the group of cars, and how unfair all of this is to a safe driver. Then you have a chance to work with the DMV because of the points on your license and your insurance company that wants to increase your rates or cancel you.
Seems like a simple choice.