RF positioning system using " triangulation"

[hoho]

rf positioning

I'm doing a final project " RF positioning system" using triangulation theory.
It consists 1 Tx and 3 Rx GSM 900 MHz and downconvert to 100 Hz and feed into PIC microcontroller

How to compute a mathematical derivation from DFT(discrete fourier transform) to find the phase difference then convert it to time. From that "maybe", I can find the angle and distance by using triangulation theory.

Can u show me the diagram and mathematical derivation ?

What type of anttena should i use ? Directional or undirectional ?

Any recomended site for free sample for RF ic chip to Malaysia?
Maybe my explaination a bit confussing, anyway help me even u know or don't know !!

TQ

 

[fastelec]

rf triangulation

Dude this project is rather complicated.
I recomend to read following:
hxxp://www-imt.unine.ch/mogid/
You shoud read gsm standart very carefully.To succeed with such a project you need phone with service firmware.

 

[radiohead]

rf positioning system

Please note that at 900MHz wavelength in open air is only 30cm. So your algorithm will give you a lot of equivalent solutions at 30cm distance. Try to use a lower freq if you can!

 

[djalli]

triangulation rf

I am unfamiliar with this " triangulation theory" in RF. Can someone shed some light?