I wondered and googled "rssi values vs. distance" and reached some papers.
http://www.ece.rochester.edu/research/wcng/papers/conference/holland_sec on06.pdf http://zoo.cs.yale.edu/classes/cs490/03-04b/nana.dankwa.ee.pdf Firat TARAKTAS Electrical&Electronics Engineer Reseracher GENETLAB INFORMATION TECHNOLOGIES Kayisdagi Caddesi Kar Plaza D Blok Kat:3 34752 Icerenkoy / ISTANBUL / TURKIYE Phone: +90 (216) 573 00 85 (int.354) Fax: +90 (216) 469 85 07 [EMAIL PROTECTED] www.genetlab.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of CASTEL Myriam Sent: Wednesday, July 04, 2007 4:35 PM To: tinyos-help@Millennium.Berkeley.EDU Subject: [Tinyos-help] relationship between RSSI and distance Hello, I'm trying to use RSSI value to obtain the distance between two sensor nodes mica2. I know that a lot of such experiments are made and that a lot of people use this method. However, when I do the experiment, I obtain unexploitable results: - between 0 and 70 cm, I obtain always the same RSSI. - above 150cm, all values of RSSI are possible. More strange: i do the same with micaz, and the results are exploitable. For information, I am using rcv_packet->strength to obtain RSSI knowing that the transmitted power is always the same. Can anybody tell me if it possible to use mica2 and RSSI to obtain distance and if yes, how to do that and why I didn't manage? Thanks for your help. _______________________________________________ Tinyos-help mailing list Tinyos-help@Millennium.Berkeley.EDU https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-hel p _______________________________________________ Tinyos-help mailing list Tinyos-help@Millennium.Berkeley.EDU https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
