Fig. 5
From: Software-defined radio-based HF doppler receiving system
Schematic of the evaluation system of the new digital receiver (USRP). In this system, the 10-MHz reference signal output from the GPS-Disciplined oscillator (GPSDO) was supplied to the signal generator. Using a coupler, the signal from the signal generator was supplied to both analog and digital receivers simultaneously. The outputs from both receivers were processed by separate PCs