Lpc2000

I thought the commercial systems used phase shift to determine distance?

Al

Leon Heller wrote:

>----- Original Message ----- 
>From: "brendanmurphy37" <brendanmurphy37@...>
>To: <lpc2000@yahoogroups.com>
>Sent: Tuesday, May 16, 2006 2:35 PM
>Subject: [lpc2000] Re: Hello all....
>
>
>
>You might want to do some basic sums before you start. Light goes at
>approximately 300 million metres/second. To measure to an accuracy
>of a meter would thus require an accuracy of clock the inverse of
>this (3ns or so). On any micro this is a major challange....
>
>I'd suggest you use a different technique!
>
>I'd use a CPLD or FPGA to do the timing. The commercial systems probably do 
>it that way.
>
>Leon 
>
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