[Tinyos-help] Time Stamp

Miklos Maroti mmaroti at math.u-szeged.hu
Sat Feb 28 13:37:34 PST 2009


Dear Islam,

So whats the answer? Please do calculate that, or better calculate 1
centimeter precision, and let us know the numbers.

Miklos

On Sat, Feb 28, 2009 at 10:29 PM, Islam Mohamad Ameen Al Jarrah
<g00022093 at aus.edu> wrote:
> Dear Miklos,
>
> 1 meter precision?? If I am doing my calculations in an environment which is small lets say 1 meter by 1 meter !! this method will be useless right??
>
> I read a paper about a precise algorithm to calculate the distance and time is one of the algorithm parameters.
>
> Regards,
> Islam
>
> ----- Original Message -----
> From: Miklos Maroti <mmaroti at math.u-szeged.hu>
> Date: Sunday, March 1, 2009 1:06 am
> Subject: Re: [Tinyos-help] Time Stamp
> To: Islam Mohamad Ameen Al Jarrah <g00022093 at aus.edu>
> Cc: Janos Sallai <sallai at isis.vanderbilt.edu>, tinyHelp <tinyos-help at millennium.berkeley.edu>
>
>
>> Dear Islam,
>>
>>  Please calculate the time stamping precision you need to get 1 meter
>>  precision in the distance using the speed of light, and let us know.
>>
>>  Miklos
>>
>>  On Sat, Feb 28, 2009 at 9:50 PM, Islam Mohamad Ameen Al Jarrah
>>  <g00022093 at aus.edu> wrote:
>>  > 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
>>  >>  >
>>  >>  > _______________________________________________
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>>  >>  >
>>  >>
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>>
>



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