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 <g00022...@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 <sal...@isis.vanderbilt.edu> > Date: Saturday, February 28, 2009 2:54 am > Subject: Re: [Tinyos-help] Time Stamp > To: Islam Mohamad Ameen Al Jarrah <g00022...@aus.edu>, tinyHelp > <tinyos-help@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 >> <g00022...@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@millennium.berkeley.edu >> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > >> > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
