rf positioning
时间：04-12
整理：3721RD
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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
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
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.
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!
I am unfamiliar with this " triangulation theory" in RF. Can someone shed some light?