Date: Wed, 24 Mar 1999 14:07:00 -0800

Author: Earl Dolnick

Subject: Re: GPS synchronization

Post:

At home, I use Rightime, a shareware product. It calls NIST, passes a
token back and forth to measure the time delay, and then sets the computer
clock accordingly, for the price of a 15 sec. long distance call. There is
other companion software to track your pc clock. After you call NIST a few
times, it calculate the drift rate, and then regularly adjusts the pc time.
Clever.

Cheers, Earl D.








At 12:45 PM 3/24/99 -0600, you wrote:
>>1.Has anyone ever sinchronized a PC with GPS time?
>>2.Is it possible to have a milisecond accuracy??
>>3.Is it possible to do it via internet?
>
>Look for various NTP shareware products. (Network Time Protocal)
>Many folks run NTP servers to syncronize computer clocks (eg. Natl. B. of
>Standards, the Navy, many ISP's).
>
>More advanced NTP clients will calculate the real frequency of your CPU clock
>based on the average of corrections over the course of several days and
weeks.
>This _may_ get you within a milisecond.
>
>A standard handheld GPS device will pinpoint your position to within a few
>hundred feet. To do that, it would require time signals with an accuracy of
>better than a milisecond.
>
>Paul Nord
>
>
>


****************************************************************************
Earl M. Dolnick, Senior Development Engineer
Undergraduate labs, 2125 WLH
Dept. of Physics 0424
University of California, San Diego
La Jolla CA 92093-0424
Phone and FAX (619) 534 8154
and,if that's not enough:
edolnick@ucsd.edu

****************************************************************************

Back