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A new time-scale EPT62 has been constructed based on the observations of 62 millisecond pulsars in the Version A of second data release from the International Pulsar Timing Array (IPTA). Timing noise was analysed carefully for each pulsar and then weighted generalised least square algorithm through Cholesly transformatin was carried out to extract clock error of referenced international atomic time-scale (TAI). The EPT62 spans 29 years and the lock difference EPT62-TAI is given in the Fig. 1. The clock fifference between terrestrial time TT(BIPM2015) and TAI is also shown in the Fig.1. EPT62-TAI and TT(BIPM2015)-TAI show generally similar trends except early few data ponts. Because available observational data are much sparse before MJD 50215 the corresponding EPT62-TAI data points in this period have lager errorbar. The frequency difference data between primary and secondary frequency standards (psfs) and TAI were published in real-time by the Bureau International des Poids et Mesures (BIPM) to supply frequency standard defining SI second for constructing time-scale. The combined smoothing filter was employed to combine clock difference EPT62-TAI and frequency difference between frequency standards and TAI. Then pulsar time and atomic frequency standards combined time-scale (CPA) was derived through the combined smoothing filter. The clock difference CPA-TAI is shown with black curve in the Fig. 1. For the frequency difference curves of psfs-TAI clock difference before and after combined smoothing see Fig. 5 in the text. The constructing process of the CPA was discribed. The property of the CPA was compared in detail with terrestrial time TT(BIPMxxxx). The CPA combined long term frequecy stabily of the EPT62 and acuracy of the atomic frequency standards. In general the property of the CPA is compatible to TT(BIPMxxxx). The comparison of fractional frequecy stability σz curves for EPT62-TAI, CPA-TAI and TT(BIPM2015)-TAI is shown in the Fig. 4 in the text. The CPA can also be used as terrestrial time as TT(BIPMxxxx). Terrestrial time TT(BIPMxxxx) is available one year later whereas CPT may be computed and kept in “real-time” in the future. Finally a brief discussion and some conclusions are given.
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Keywords:
- atomic time /
- frequency standard /
- millisecond pulsar /
- pulsar time /
- time-scale
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