What do I do I feel that I am innocent because of the way I got the over speeding infraction?

Without more details about how you "got the infraction", it's impossible to give you an answer.

Set it for trial, and if the cop doesn't show up you win.

Absolutely! But you will have to post "bail' first. It's a system that is unfair in many respects - not unlike much of the criminal justice system (but not as bad as the forfeiture system in this country) - designed to make it difficult for you to go to trial and most people simply pay the ticket instead of fighting it. But yes, you absolutely have the right to a trial if you believe you were not speeding.