Sawtooth Error Elimination for ultra stable system clocks
In conventional receivers the system clock driving its PPS and frequency outputs are often asynchronous with GPS time. This results in sawtooth or quantisation errors, which can become a major contributor to jitter when creating an accurate, stable PPS or reference frequency or host system clock. To account for the misalignment between the PPS and GPS time, receivers estimate the constantly variable alignment error and report it via a serial port so the host can apply a “correction” via external, additional circuitry “sanitising” the output for use.
In contrast, SigNav’s subATTO™ suite of technologies is far from conventional – it eliminates sawtooth errors! The system clock, PPS and frequency outputs of SigNav’s receivers are precisely aligned to GPS time. This not only eliminates the sawtooth error, but also the need for expensive “correction mechanisms”, dramatically simplifying implementations.
Since jitter is no longer a problem, sawtooth error elimination coupled with ultra low phase noise and the frequency output can be used as the host’s system clock, relieving the need for yet another clock to be implemented, providing even further cost savings.
