Care to disclose the encryption keys for the military signal? Someone has to have broken it by now... -Adam Jim wrote: >Remember y'all ("you all") - you're ("you are") using "C/A Code" >as opposed to "P Code" to do this position determination, too! > >C/A - Course/Acquisition Code, used initially to "lock-in" >(acquire) on the GPS SS signal *from which* one would normally >(as originaly envisioned) transitioning to using "P Code". > >Chip rate for C/A code is 1.023 MHz > >P Code - precision Code. Used for *precise* postioning. What is >currently being done with C/A code alone is way past the orgiginal >intentions of the GPS system designers! > >Chip rate for P Code is 10x the C/A code rate, or 10.23 MHz. > >*Nor* are you using [the] L2 [frequency] of 1227.6 MHz to account >for/offset the effects of RF transmission through the atmosphere ... > >All in all, civilian applications are accessing only *a fraction* of >what the GPS system *is* currently supplying in the way of capability >and signals to the military (and certain qualified civilian applications). > > RF Jim (Veteran of the GPS-HDUE (High Dynamic User Equipment) program at >TI) > > >----- Original Message ----- >From: "Alan B. Pearce" >To: >Sent: Friday, September 06, 2002 3:28 AM >Subject: Re: [EE]:Barometer & Altimeter > > > > >>>Thats not too bad, the average aircraft altimeter is +/- 75 feet. Even >>>after we ran them through the shop they were never dead on accurate. >>> >>> >>Yeah, if you get a GPS receiver where you can get at the raw data, and >> >> >leave > > >>the aerial sitting at a stable point for an hour or so, and collect data, >> >> >it > > >>is quite revealing how the "position" wanders. And this is with SA turned >>off :) >> >> >> > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. > > > > > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.