excessive speeding on I-5 in California

Greetings and thank you for reviewing my situation and your advice.

I have recently been stopped by the CHP for speeding on I-5 heading south towards Los Angeles. I noticed the patrol car behind me while I was following a sedan in the left lane, both of us passing a truck. I pulled over and after having been asked for DL and registration, the officer left for his patrol car. When he returned he handed me a ticket noting that I had been found driving at 102mph (speed limit was 70mph.) I was in utter disbelief (and so were my two traveling companions - sister and her partner) about the speed he listed on the ticket and told the officer so. While I have caught myself speeding (especially on I-5) I have not once in my entire life driven at 102mph, and not once received a ticket for speeding in the 15 year that I am living in the US.
When I asked the officer for a printout of the shows the speed I was driving at, he said it was measured by a radar gun. I don't know at what point he measured my speed but when I noticed the patrol car behind me, I was driving at approximately 85mph. I signed the "Notice to Appear" under protest, and was advised I had to appear in court and could contest the ticket there. The CHP officer could not give me any details about the court appearance (date, time, etc.) nor the procedure for the protest. He simply advised me I would receive a notice with further instructions by mail. As of now, I have received a "Notice of Correction and Proof of Service" indicating the location of the traffic violation needed to be changed from what the ticket listed (northbound is on the ticket, southbound is correct) and payment instructions for the bail amount ($878.00) in addition to the "Notice to Appear" I was initially handed. The incident happened last month; I am becoming nervous about the court date and have emailed the court clerk on Friday to check on my scheduled court date.

I would like to contest the ticket because I sincerely believe the radar reading was incorrect and can provide witness statements - will I stand any chance? Oh yes, and then there is the issue of the location - I live in San Francisco and will have the court appearance in Coalinga, Fresno County - that is one long drive...