I'm looking for tools able to generate, capture and analyze traffic from WLAN cards and GPS receivers.

I would like to grab and plot:

The main problem is to match RSSI, PER and throughput with GPS information (position, distance, speed).
The main idea was to use wireshark and kismet with gpsd capturing RSSI from AVS (Absolute Valie Systems) or BSD Radiotap. I hope MadWiFi driver works.

I'have two laptops equipped by Intell Pro/wireless 3945ABG WLAN and I'm still looking for a useful GPS receiver with external antenna.
I need open source wifi and GPS survey tools.
Do you have or know some useful tools or scripts?

thanks a lot!