Generating A Timing Information (1-PPS) From A Software Defined Radio Decoding of GPS Signals

We complement a secure, Software Defined Radio (SDR) implementation of Global Navigation Satellite System (GNSS) reception system with the 1-Pulse Per Second (PPS) output to steer the oscillator driving the analog to digital converter, the only reliable timing information in a SDR reception chain. We demonstrate long-term 1-PPS output and the derived Allan deviation consistent with the 10−8 at 1 s decreasing to 10−12 at 104 s performance met with most single frequency GNSS receivers.