Appear in court and talk to the officer. He may not appear. If he does then he may agree to reduce the ticket to a lower speed.

There used to be a guy here who sold a book on how to beat tickets. I think it was called "Case Dismissed". The ad for it sounded a little too good to be true. I'm an attorney, and I don't know about any foolproof way to get a speeding ticket dismissed. But I think the book came with some kind of money back guarantee, so you might want to give it a try.