[Tinyos-help] relationship between RSSI and distance

[Firat TARAKTAS]

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
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Phone: +90 (216) 573 00 85 (int.354)
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firat.taraktas at genetlab.com
www.genetlab.com


-----Original Message-----
From: tinyos-help-bounces at Millennium.Berkeley.EDU
[mailto:tinyos-help-bounces at Millennium.Berkeley.EDU] On Behalf Of CASTEL
Myriam
Sent: Wednesday, July 04, 2007 4:35 PM
To: tinyos-help at 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.



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