Hello.
I need to implent a two way ranging. A device send an “echo”, a second
device discover the “echo” and send a reply, then the first device can calculate
the distance. For a correct distance evalutation, the second device must
calculate the time elapsed between the discover of the first echo and the reply
response.
Let’s assume that the second device is a SDR with gnu radio & USRP1
device.
The problem is: how to time-correlate the streaming sample received from
the USRP and the streaming sample transmitted to the usrp.
If i pre-fill the usrp transmit buffer with dummy data (preventing
underflows) before starting acquisition&transmission, then i can correlate
the two streams, right? (Yes, with the hypothesis that i don’t miss data from
usb).
Thank you