On estimation of high frequency geophysical signals in Earth rotation by complex demodulation |
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| Affiliation: | 1. Warsaw University of Technology, Faculty of Geodesy and Cartography, Warsaw, Poland;2. Space Research Centre, Polish Academy of Sciences, Bartycka 18A, 00-716 Warsaw, Poland;1. Institut für Zoologie und Evolutionsforschung, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany;2. State Key Laboratory of Biocontrol/The Museum of Biology, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China;3. Australian National Insect Collection, CSIRO, GPO Box 1700, Canberra, ACT 2601, Australia;4. National Museum, Cirkusová 1740, CZ-19100 Praha 9, Czech Republic;5. Department of Zoology, Faculty of Science, Charles University, Viničná 7, CZ-12844 Praha 2, Czech Republic;6. College of Life Sciences, Capital Normal University, Xisanhuanbeilu 105, Haidian District, Beijing 100048, China;2. Department of Genetics and Biotechnology, Osmania University, Hyderabad 500007, TG, India;3. Bioclues.org;4. Patient MD, Chicago, IL 60640-5710, United States;5. Instituto Peruano de Energía Nuclear, Avenida Canadá 1470, Lima, Peru |
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| Abstract: | Polar motion and UT1 contain small geophysical signals (<0.1 milliarcsecond) driven by the daily cycle in the solar heating. These signals are either irregular or quasi-harmonic therefore need to be expressed by the time series and studied using the time domain techniques. This work is focused on the complex demodulation method which seems to be particularly useful for studying high frequency geophysical signals in Earth rotation. After general introduction of the method and its properties, we describe its application for modeling diurnal and subdiurnal components of polar motion and UT1 and of the corresponding excitation functions. We also derive dynamical equations which can be used for direct comparison of the signals demodulated from the Earth rotation and geophysical excitation data. |
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