2023年4月23日 · 根据iers发布的eop数据进行插值、内插和外推时，常用的插值方法包括线性插值、拉格朗日插值、牛顿插值和样条插值等。其中，线性插值简单快速，但精度不高；拉格朗日插值和牛顿插值可以提高精度，但计算量较大；样条...

ICRF: The International Celestial Reference Frame (ICRF) consists of equatorial coordinates of extragalactic radio sources observed with VLBI, realizing an ideal reference system, the International Celestial Reference System (ICRS).

2012年11月27日 · The goal of this study is to determine the effect the switchover from ICRF to ICRF2 has on the terrestrial reference frame (TRF), the celestial reference frame (CRF), and Earth orientation parameter (EOP) results from VLBI solutions.

We calculated the effect of this rotation on the Earth orientation parameters (EOP). In order to improve the stability of the celestial reference frame we suggest a new method for the selection of the defining sources. The method consists of two criteria: the first one we call “cosmological” and the second one “kinematical”.

2019年3月1日 · These allow the transformation [2] between the International Terrestrial Reference Frame (ITRF) and International Celestial Reference Frame (ICRF). The precise version of Universal Time known as UT1 best represents the instantaneous orientation of Earth, while Universal Time Coordinated (UTC) has only mandated occasional adjustments.

2018年3月12日 · The EOP connecting an ITRF and an ICRF are composed of five parameters. The two celestial pole offsets provide corrections to a conventional precession-nutation model, two parameters describe the polar motion w.r.t. the Earth’s crust, and one gives the irregularities of its angular velocity.

Very Long Baseline Interferometry (VLBI) technique is used by the International Earth Rotation Service and Reference System Service (IERS) for production of the Earth orientation parameters (EOP). They are required to study Earth orientation variations.

2019年4月11日 · We address the impact on the EOP estimates due to the switch from the ICRF2 to the ICRF3, from the view of the linear rate of EOP series and residual on the MHB nutation terms. Two VLBI...

The Earth orientation parameters (EOP) are the parameters linking these two frames, and they are common parameters between the space geodetic techniques whose observations are used to estimate the ICRF and ITRF.

ICRF: The International Celestial Reference Frame (ICRF) consists of equatorial coordinates of extragalactic radio sources observed with VLBI, realizing an ideal reference system, the International Celestial Reference System (ICRS).