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 <g00022...@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 <mmar...@math.u-szeged.hu> > Date: Sunday, March 1, 2009 1:06 am > Subject: Re: [Tinyos-help] Time Stamp > To: Islam Mohamad Ameen Al Jarrah <g00022...@aus.edu> > Cc: Janos Sallai <sal...@isis.vanderbilt.edu>, tinyHelp > <tinyos-help@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 >> <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
