[Tinyos-help] Time Stamp
Islam Mohamad Ameen Al Jarrah
g00022093 at aus.edu
Sat Feb 28 12:50:08 PST 2009
Thanks for the reply,
well do you mean to say that it needs a lot of work and it is not effiecient to find the distance according to the Time !! Is there a source code that could help me to implement such an algorithm??
----- Original Message -----
From: Janos Sallai <sallai at isis.vanderbilt.edu>
Date: Saturday, February 28, 2009 2:54 am
Subject: Re: [Tinyos-help] Time Stamp
To: Islam Mohamad Ameen Al Jarrah <g00022093 at aus.edu>, tinyHelp <tinyos-help at millennium.berkeley.edu>
> It's a tough problem. RF waves travel 300 meters in a microsecond.
> This is typically more than the communication range of the motes.
> TEP132/133 prescribes millisecond precision timestampint. The best
> timestamping precision you can hope for is 2-3 microseconds on
> average, but you need to hack the radio stack code in order to achieve
> that. Then, there's the jitter (look at the FTSP paper by Miklos
> Maroti et al. for a list of different sources of jitter).
> On Fri, Feb 27, 2009 at 3:41 PM, Islam Mohamad Ameen Al Jarrah
> <g00022093 at aus.edu> wrote:
> > Dear All,
> > I need to send a packet from one mote to another with a time stamp
> where it
> > will be used to calculate the distance between the two motes, and
> need to
> > send an acknowledgment back to the source also with a time stamp!
> Can any
> > one help me with this?
> > Regards,
> > Islam
> > _______________________________________________
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> > Tinyos-help at millennium.berkeley.edu
> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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