The on-board GPSDO (TCXO) is the clock source module for GPS signal synchronization of USRP-LW B210. It adopts a temperature-compensated crystal oscillator. GPSDO provides a high-precision 10 MHz local oscillator and 1 PPS signal, which can greatly improve the frequency accuracy (75 ppb when GPS signal is not locked) and achieve global time synchronization (50 ns in GPS locked state).

The onboard GPSDO (OCXO) is a board-mounted GPS signal synchronization device that adopts a constant-temperature crystal oscillator. It is compatible with USRP-LW X300 or X310, and can also be used with USRP-LW B210. However, an external power supply is required for the system. The GPSDO provides a high-precision 10 MHz reference signal and 1 PPS signal, enabling developers to build application systems with higher frequency accuracy and global timing calibration.