With speed contest written on the ticket I’d say that is a pretty safe bet. You’ve got two choices.
A.) Get a lawyer and get the consequences reduced as much as possible.
B.) Go it alone and hope they take pity. Anything that boils down to your word vs. cop’s word (like that the cop couldn’t have radar’d you where he did) will be useless to you. Pretty much the only thing you’ll be able to say on your own is “I’m sorry.”
I’d bet that it would financially be a wash betwen lawyer’s fees and fines if you go alone, so I’d show up with a lawyer and try to minimize the legal consequences.