Improving Methods and Facilities for the Evaluation of Earth Orientation Parameters at the MMC SSTF
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TIME AND FREQUENCY MEASUREMENTS IMPROVING METHODS AND FACILITIES FOR THE EVALUATION OF EARTH ORIENTATION PARAMETERS AT THE MMC SSTF S. L. Pasynok, I. V. Bezmenov, I. Yu. Ignatenko, E. N. Tcyba, and V. E. Zharov
UDC 521.92+521.93
The results of work carried out over the last five years to improve the methods and facilities of the Main Metrological Center of the State Service of Time, Frequency, and Determination of the Parameters of the Earth Rotation (MMC SSTF) are described. Modernization was carried out both in terms of hardware and software. As a result of the work carried out at the MMC SSTF, a software correlator has been established, computer facilities have been updated, and a Data Processing and Analysis Center has been created. The All-Russia Research Institute of Physicotechnical and Radio Measurements now possesses a new-generation satellite laser range finder created by the Scientific and Production Corporation Precision Instrumentation Systems. New software packages for processing laser measurements, including lunar laser range-finding measurements, were developed. Software providing metrological support for the spacecraft orbits of Russian and American global navigation satellite systems was developed. Software for processing measurements on radio interferometers with extra-long bases and joint data processing has been modernized. The development of facilities for determining and predicting the Earth’s rotation parameters took place in line with current international trends, allowing work aimed at determining and predicting parameters of the Earth’s rotation to be carried out at a high international level. Keywords: Earth rotation parameters, Earth rotation parameters determination service, ultra-long base radio interferometers, global navigation satellite systems, satellite and lunar laser ranging.
Introduction. The Main Metrological Center of the State Service of Time, Frequency, and Determination of Earth Orientation Parameters (MMC SSTF) is entrusted with the provision of scientific, methodological and operational support to the SSTF in reproducing the national timescale and reference frequencies, determining Earth Orientation Parameters (EOP), as well as in addressing the state’s need in time and frequency reference signals, information about the EOPs, the exact Moscow time, and the calendar date. EOPs characterize the positional relationship between the terrestrial (TRS) and celestial reference systems (CRS). Given that in the CRS the equations describing the movements of bodies in near-Earth space are the simplest in form, with the relevant measuring instruments and tracking stations located on the Earth’s surface, it is important to know how the Earth’s surface is oriented relative to the CRS at any point in time. If objects move across the Earth’s surface or underwater while offline (disconnected from the external information sources), EOPs are also needed for the description of their movement. Special requirements for the accuracy, promptness, and reliability of EOP data are imposed by ba
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