Jim,

All I can remember was an article stating that during the gulf war the
accuracy of the GPS system was increased dramatically, and after the war
finished, some of the satellites were turned off :o(

The accuracy could have been ,10 mm not cm as it has been a while since
reading the article.


Regards,

Kat.

____________________________________________________________________________
 The information contained in this email and any files transmitted with it
are confidential and intended solely for the use of the individual or entity
to whom they are addressed. If you have received this email in error please
promptly notify the sender by reply email and then delete the email and
destroy any printed copy. If you have received this email in error, you must
not disclose or use this information in any way.
____________________________________________________________________________


----- Original Message -----
From: "Jim" <jvpoll@DALLAS.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, August 31, 2001 11:01 PM
Subject: Re: [EE]: - Botboard


>       "I think when all the satellites are operational the
>        accuracy is in the cm's (<10cm)"
>
> Do you have a source on that accuracy figure?
>
> Is that using what is called 'P code' - Precision code,
> using a 10.23 MHz chip rate and available -so far- only
> to the US Military versus 'C/A code' - (Course/Acquisition
> code - available for civil apps) which uses a 1.023 MHz
> chip rate?
>
> There are ways right now to gain increased accuracy - such
> as DGPS - differential GPS - simplified explanation: a technique
> wherein *the position error* in the GPS sugnal from the satellites
> in a given geographical area is noted and transmitted for use as a
> correction factor by user-segment GPS equipment.
>
> One could *also* implement one's own localized "GPS"
> system (as was done when test of the system was done at
> Yuma Az) during development testing. One could use the
> principles of the GPS system and implement a localized
> position determining system using unlicensed gear in the
> 900 MHz ISM-band ... perfect app for a PIC ...
>
>
> Jim  (a veteran of GPS/HDUE (High Dynamic User Equipment)
> development at TI in the late seventies ...)
>
>
> ----- Original Message -----
> From: "Kathy Quinlan" <katinka@MAGESTOWER.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Friday, August 31, 2001 9:10 AM
> Subject: Re: [EE]: - Botboard
>
>
> > Start another war involving America, all the military satellites come
> online
> > and use GPS I think when all the satellites are operational the accuracy
> is
> > in the cm's (<10cm)
> >
> > Regards,
> >
> > Kat.
> >
> >
>
> --
> http://www.piclist.com hint: The list server can filter out subtopics
> (like ads or off topics) for you. See http://www.piclist.com/#topics
>
>

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics