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Posted by:dragorn
Subject:kismet loging information and distance determination
Date:20:30:11 01/12/2007

> I am trying to calculate distance between the receiver and the AP.
> In the gps log file were signal='###' I need to know what the unit for that measurement is. If anyone knows the calculations I need to run in order to get the distance based on that number for the signal given above and if there is a requirement for a beginning power I have figures that I can use for that.
>
> Thanks in advance

Whatever the card reported it in.

If it's negative, it should be dBm. If it's positive, it's RSSI with no known conversion (if the conversion was known, the drivers would be converting it to dBm instead). RSSI w/ no converter function is useless, unfortunately.

Signal levels in RFMon tend to be very suspect in general. If you assume they're true signal reports, you still have to contend with loss from known objects. There is no simple way to derive distance to a transmitter of unknown power, unknown direction, and unknown obstacles.

-m


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