Solution
The USRP or USRP-RIO device equipped with a GPSDO module takes a lot of time searching for GPS signals. This is the reason why the default value of the
Satellite Fix Timeout on the front panel is set to 600 seconds. You can adjust this timeout value by configuring
timeout of
niUSRP Wait For Lock.vi.
After locking the GPS signal, in
niUSRP EX Tx with GPS.vi or
niUSRP EX Rx with GPS.vi, USRP or USRP-RIO devices start to generate or acquire RF signals. If the GPS locking process is failed, you need to place the GPS antenna connected to the GPS antenna port of USRP on another place to receive much better GPS signals.