Applying clock comparison methods to pulsar timing observations

ABSTRACT Frequency metrology outperforms any other branch of in accuracy (parts 10?16) and small fluctuations (<10?17). In turn, among celestial bodies, the rotation speed millisecond pulsars is by far most stable (<10?18). Therefore, precise measurement time arrival (TOA) pulsar signals expected to disclose information about cosmological phenomena, enlarge our astrophysical knowledge. Related this topic, Pulsar Timing Array projects have been developed operated for last decades. The TOAs from a can be affected local emission environmental effects, direction propagation through interstellar medium or universally gravitational waves super massive black hole binaries. These effects (signals) manifest as low-frequency fluctuation over time, phenomenologically similar red noise, while remaining intrinsic instrumental background (noise) are white. This article focuses on frequency pulsars. From standpoint, an accurate clock, measured simultaneously with several telescopes order reject uncorrelated white noise. We apply modern statistical methods time-and-frequency simulated data, we show detection limit correlated noise signal between telescopes.