Search around for messages and papers on RSSI localization, it's not very accurate for many reasons. MS
shankar satish wrote: > I have been measuring RSSI values on Mica2s. There does not seem to be > any significant change in RSSI values when the mote separation changes > by 1m. Noticeable changes seem to happen only once every 5 meters. > > -Regards, > Shankar. > On Mon, Apr 14, 2008 at 4:55 PM, Ittipong Khemapech > <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote: > > Nothing seems wrong with your results. I have sort of similar results. > > Ittipong > > On 14/04/2008, *Eli Gotesman* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > Hi, > > I made the following experiment: > I've placed one sensor each 0.5m for 20m, and there is one > sensor that sends 1000 messages to everyone. > After the sending stage, each sensor has 1000 samples of RSSI > values, and I compute the mean value for each distance (each 0.5). > My problem is that there are some distances that their mean > values of RSSI are too close, > but maybe it suppose to be this way... > > > > On Sun, Apr 13, 2008 at 7:09 AM, Ittipong Khemapech > <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote: > > In my opinion, the RSSI readings are quite susceptible to > various environmental conditions. Conducting more runs may help. > > How many runs per distance have you done? > > I think you may compute the median and compared it to the > average. > > Ittipong > > On 13/04/2008, *Eli Gotesman* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > Hi, > > I'm working on an application that implements a > localization algorithm that uses RSSI values to > determine the distance. > I did a little experiment to see the average value of > RSSI for different distances, and the resolution of the > average values that I got isn't good enough for me. > Is there a way to get a more accurate value of a RSSI > reading (maybe a way to get a double and not an integer...) > > Thanks, > Eli > > _______________________________________________ > Tinyos-help mailing list > [email protected] > <mailto:[email protected]> > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > <mailto:[email protected]> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help -- Platform: WinXP/Cygwin TinyOS version: 1.x, Boomerang Programmer: MIB510 Device(s): Mica2, MicaZ, Tmote Sensor board: homebrew _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
