Lpc2000

----- Original Message ----- 
From: "Onestone" <onestone@...>
To: <lpc2000@yahoogroups.com>
Sent: Tuesday, May 16, 2006 3:15 PM
Subject: Re: [lpc2000] Re: Hello all....


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

Some measure the time for the pulse to return:

http://www.acuityresearch.com/products/ar4000/index.shtml

http://near.jhuapl.edu/fact_sheets/NLR.pdf

Leon
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