[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??

Regards,
Islam

----- 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).
>  
>  Janos
>  
>  
>  
>  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
>  >
>  > _______________________________________________
>  > Tinyos-help mailing list
>  > Tinyos-help at millennium.berkeley.edu
>  > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>  >
>  


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