measure distance radio

does anybody know how to measure distance using radio frequency method?
let said, i have a RF transmitter located at point A transmit a 100Mhz signal, and a receiver located at point B.
is it possible to know the distance between point A and point B by using calculation?

Dear,

It is simple.You send a pulsed rf signal at Point A and receive it at Point B.with time
difference between send & receive you can calculate the distance.but your transmitter

controller & receiver processor must be synchronized.for example you can have
2 real time clocks,one @ A & another @B.in Tranmitter controller @ Point A you

can use a time table to send rf pulses,@ point B you know the transmitter time table
and when you receive rf pulse you can calculate the time difference and calculate

distance(by multiply time difference to light speed).but you must be careful,every
1us error in time gives you about 300meters error in distance.

Good Luck!

Look into how GPS and LORAN works. You can transmit a pseudo random noise code and from that you can get a timestamp and measure code phase for distance.

in my project i use a microcontroller to calculate the distance. RF is propagate with light propagation speed.. is there any microcontroller have the ability to respond so fast?

If you know the gains of transmistter and receiver antenna u can use Friis transmission equation to measure the distance usinf RF

I really interested in this topic. Is there any rf module to send and recieve this wave?

Search for RDFs , LORAN, or RADARs