Nd open source program to detect signal stg of an access point link with wireless cli

[factor]

i am finding an open source software tt detect signal stg of the link prefered in dB.
or maybe also connect the client to the ap. I haf tried lots of programs but all doesn;t work.. can any 1 pls tell mi where to get them.. i nd a sample to start off my project.

Ps: i will be doing a project to detect the physical presense of a person using a wirelss client. If he move ard the area the server will be notified. but now i am ard stuck at the 1st part.. can any1 pls kindly help.. thx

 

[XeoNoX]

try

http://www.cirond.com/winc.php

or

http://www.netstumbler.com/

they both have an option for DB.