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Journal articles on the topic 'Artificial satellites ; Geophysics ; Geodetic satellites'

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1

Pearlman, M., D. Arnold, M. Davis, et al. "Laser geodetic satellites: a high-accuracy scientific tool." Journal of Geodesy 93, no. 11 (2019): 2181–94. http://dx.doi.org/10.1007/s00190-019-01228-y.

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2

Exertier, P., G. Métris, S. Bruinsma, and F. Barlier. "Mean Orbital Motion of Geodetic Satellites and its Applications." International Astronomical Union Colloquium 165 (1997): 332–40. http://dx.doi.org/10.1017/s0252921100046765.

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AbstractAveraging methods are convenient tools for studying long-periodic variations of the motion of artificial satellites. The main lines of a semi-analytical theory of the mean motion are given. We show how, when coupled with a careful reduction of the tracking data, this theory allows to determine parameters related to the temporal variations of the Earth gravity field (e.g. the amplitude of 18.6 years tide and the secular variation of even zonal harmonics). The theory is also very useful for other applications such as mission analysis.
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3

Najder, Joanna, and Krzysztof Sośnica. "Quality of Orbit Predictions for Satellites Tracked by SLR Stations." Remote Sensing 13, no. 7 (2021): 1377. http://dx.doi.org/10.3390/rs13071377.

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This study aims to evaluate and analyze the orbit predictions of selected satellites: geodetic, Global Navigational Satellite Systems (GNSS), and scientific low-orbiting, which are tracked by laser stations. The possibility of conducting satellite laser ranging (SLR) to artificial satellites depends on the access to high-quality predictions of satellite orbits. The predictions provide information to laser stations where to aim the telescope in search of a satellite to get the returns from the retroreflectors installed onboard. If the orbit predictions are very imprecise, SLR stations must spen
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4

Krzysztof, Sośnica. "Impact of the Atmospheric Drag on Starlette, Stella, Ajisai, and Lares Orbits." Artificial Satellites 50, no. 1 (2015): 1–18. http://dx.doi.org/10.1515/arsa-2015-0001.

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Abstract The high-quality satellite orbits of geodetic satellites, which are determined using Satellite Laser Ranging (SLR) observations, play a crucial role in providing, e.g., low-degree coefficients of the Earth's gravity field including geocenter coordinates, Earth rotation parameters, as well as the SLR station coordinates. The appropriate modeling of non-gravitational forces is essential for the orbit determination of artificial Earth satellites. The atmospheric drag is a dominating perturbing force for satellites at low altitudes up to about 700-1000 km. This article addresses the impac
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5

Schutz, B. E. "New Observational Techniques and Precise Orbit Determination of Artificial Satellites." International Astronomical Union Colloquium 165 (1997): 79–85. http://dx.doi.org/10.1017/s025292110004639x.

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AbstractModern observational techniques using ground-based and space-based instrumentation have enabled the measurement of the distance between the instrument and satellite to better than one centimeter. Such high precision instrumentation has fostered applications with centimeter-level requirements for satellite position knowledge. The determination of the satellite position to such accuracy requires a comparable modeling of the forces experienced by the satellite, especially when classical orbit determination methods are used. Geodetic satellites, such as Lageos, in conjunction with high pre
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6

Appleby, G. M. "Long-arc analyses of SLR observations of the Etalon geodetic satellites." Journal of Geodesy 72, no. 6 (1998): 333–42. http://dx.doi.org/10.1007/s001900050172.

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7

Fielding, Eric Jameson, Zhen Liu, Oliver L. Stephenson, et al. "Surface Deformation Related to the 2019 Mw 7.1 and 6.4 Ridgecrest Earthquakes in California from GPS, SAR Interferometry, and SAR Pixel Offsets." Seismological Research Letters 91, no. 4 (2020): 2035–46. http://dx.doi.org/10.1785/0220190302.

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Abstract We analyzed Synthetic Aperture Radar (SAR) images from Copernicus Sentinel-1A and 1B satellites operated by the European Space Agency and the Advanced Land Observation Satellite-2 (ALOS-2) satellite operated by the Japan Aerospace Exploration Agency and Global Navigation Satellite System (GNSS) data from the Network of the Americas for the 4 July 2019 Mw 6.4 and 5 July (local; 6 July UTC) Mw 7.1 Ridgecrest earthquakes. We integrated geodetic measurements for the 3D vector field of coseismic surface deformation for the two events, using SAR data from Sentinel-1 and ALOS-2 satellites. W
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8

Sharaf, M. A., and H. H. Selim. "Final state predictions for J2 gravity perturbed motion of the Earth’s artificial satellites using Bispherical coordinates." NRIAG Journal of Astronomy and Geophysics 2, no. 1 (2013): 134–38. http://dx.doi.org/10.1016/j.nrjag.2013.06.016.

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9

Whitney, Alan R. "Capabilities and performance of the upgraded Mark III correlator system." Symposium - International Astronomical Union 128 (1988): 429–37. http://dx.doi.org/10.1017/s0074180900119850.

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The Mark IIIA correlator system is currently operating at the U. S. Naval Observatory in Washington, D.C. in support of VLBI geodetic measurements being made by NASA, NGS, NRL, and USNO. This correlator system, developed at Haystack Observatory, is a second-generation version of the original Mark III correlator, and adds significant new capabilities such as double-speed operation, longer integration periods, and improved internal modelling.The Mark IIIA correlator can simultaneously process up to 10 baselines of data from 5 stations. Experiments including more than 5 stations may be processed
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10

Pivetta, T., C. Braitenberg, and D. F. Barbolla. "Geophysical Challenges for Future Satellite Gravity Missions: Assessing the Impact of MOCASS Mission." Pure and Applied Geophysics 178, no. 6 (2021): 2223–40. http://dx.doi.org/10.1007/s00024-021-02774-3.

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AbstractThe GRACE/GRACE-FO satellites have observed large scale mass changes, contributing to the mass budget calculation of the hydro-and cryosphere. The scale of the observable mass changes must be in the order of 300 km or bigger to be resolved. Smaller scale glaciers and hydrologic basins significantly contribute to the closure of the water mass balance, but are not detected with the present spatial resolution of the satellite. The challenge of future satellite gravity missions is to fill this gap, providing higher temporal and spatial resolution. We assess the impact of a geodetic satelli
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11

Goossen, Benjamin W. "A benchmark for the environment: big science and ‘artificial’ geophysics in the global 1950s." Journal of Global History 15, no. 1 (2020): 149–68. http://dx.doi.org/10.1017/s1740022819000378.

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AbstractSecurity concerns during the early Cold War prompted United States strategists to solicit worldwide assistance in studying Earth’s physical environment. Comprehensive geophysical knowledge required cooperation between researchers on every part of the planet, leading practitioners to tout transnational earth science – despite direct military applications in an age of submarines and ballistic missiles – as a non-political form of peaceful universalism. This article examines the 1957–58 International Geophysical Year as a powerful fulcrum in the transfer of ideas about Earth’s global envi
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12

Purnell, David J., Natalya Gomez, William Minarik, David Porter, and Gregory Langston. "Precise water level measurements using low-cost GNSS antenna arrays." Earth Surface Dynamics 9, no. 3 (2021): 673–85. http://dx.doi.org/10.5194/esurf-9-673-2021.

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Abstract. We have developed a ground-based Global Navigation Satellite System Reflectometry (GNSS-R) technique for monitoring water levels with a comparable precision to standard tide gauges (e.g. pressure transducers) but at a fraction of the cost and using commercial products that are straightforward to assemble. As opposed to using geodetic-standard antennas that have been used in previous GNSS-R literature, we use multiple co-located low-cost antennas to retrieve water levels via inverse modelling of signal-to-noise ratio data. The low-cost antennas are advantageous over geodetic-standard
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13

Rodríguez, José, Graham Appleby, and Toshimichi Otsubo. "Upgraded modelling for the determination of centre of mass corrections of geodetic SLR satellites: impact on key parameters of the terrestrial reference frame." Journal of Geodesy 93, no. 12 (2019): 2553–68. http://dx.doi.org/10.1007/s00190-019-01315-0.

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14

Laster, Stanley J. "The present state of seismic data acquisition: One view." GEOPHYSICS 50, no. 12 (1985): 2443–51. http://dx.doi.org/10.1190/1.1441875.

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Seismic data acquisition in the mid‐1980s is briefly reviewed. In terms of hardware, the trend has been toward an increased number of data channels in both land and marine applications. This has led to the development of digital telemetry systems. Positioning systems, particularly for marine work, have made use of artificial satellites. The perceived need for S‐wave information has led to development of S‐wave sources such as the horizontal vibrator. S‐waves in a few cases have been used to validate hydrocarbon indicators on seismic records. There has been a distinct trend toward three‐dimensi
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15

Lück, Christina, Jürgen Kusche, Roelof Rietbroek, and Anno Löcher. "Time-variable gravity fields and ocean mass change from 37 months of kinematic Swarm orbits." Solid Earth 9, no. 2 (2018): 323–39. http://dx.doi.org/10.5194/se-9-323-2018.

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Abstract. Measuring the spatiotemporal variation of ocean mass allows for partitioning of volumetric sea level change, sampled by radar altimeters, into mass-driven and steric parts. The latter is related to ocean heat change and the current Earth's energy imbalance. Since 2002, the Gravity Recovery and Climate Experiment (GRACE) mission has provided monthly snapshots of the Earth's time-variable gravity field, from which one can derive ocean mass variability. However, GRACE has reached the end of its lifetime with data degradation and several gaps occurred during the last years, and there wil
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16

Gusev, I. V., E. V. Dargel, I. P. Langeman, and S. A. Lebedev. "The results of calibrating satellite altimetry measurements from the space geodetic system “GEO-IK-2” in the water area of the Rybinsk reservoir." Geodesy and Cartography 973, no. 7 (2021): 43–55. http://dx.doi.org/10.22389/0016-7126-2021-973-7-43-55.

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The authors present the results of satellite altimetry measurements calibration from the space geodetic system “GEO-IK-2” in the water area of the Rybinsk reservoir, obtained through two independent methods. In the first case, the altimetry measurements were calibrated by comparing the sea surface heights with respect to the reference ellipsoid, which were calculated from radio altimeter measurements, and from the processing of ground GNSS measurements performed at the sub-satellite point at the time of passing the GEO-IK-2 spacecraft. For this, in the summer of 2020, special geodetic measurem
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17

Ma, Xian, Linsong Wang, Chao Chen, Jinsong Du, and Shida Sun. "Simulation of the Dynamic Water Storage and Its Gravitational Effect in the Head Region of Three Gorges Reservoir Using Imageries of Gaofen-1." Remote Sensing 12, no. 20 (2020): 3353. http://dx.doi.org/10.3390/rs12203353.

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The construction of a high-resolution dynamic water storage model, driven by the mass load of the huge water storage of the Three Gorges Reservoir (TGR), is the necessary basic data for accurately simulating changes in the geophysical field, e.g., gravity, crustal deformation, and stress. However, previously established models cannot meet the needs of accurately simulating the impoundment effects of TGR, because these models were simplified and approximated and did not consider the variation of river boundaries caused by water level changes. In this study, we combined high-resolution Gaofen-1
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18

Manevich, Alexandr, Vladimir Kaftan, Roman Shevchuk, and Danil Urmanov. "MODELLING THE HORIZONTAL VELOCITY FIELD OF THE NIZHNE-KANSK MASSIF ACCORDING TO GNSS OBSERVATIONS." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 16, 2021): 162–69. http://dx.doi.org/10.17770/etr2021vol1.6545.

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Within the boundaries of the Nizhne-Kansk granite-gneiss massif, which directly borders on the Atamanovskiy branch of the Yenisei Ridge, the building of an underground research laboratory for validating the safety of disposal of high-level radioactive waste began in 2019. In 2010, researchers of the Mining and Chemical Combine at Zheleznogorsk and the Geophysical Center, Russian Academy of Sciences, organized a satellite geodetic network within the boundaries of the Nizhne-Kansk massif; this network included 30 GNSS stations intended for observations of modern crustal movements.The purpose of
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19

Cheloni, Daniele, and Aybige Akinci. "Source modelling and strong ground motion simulations for the 24 January 2020, Mw 6.8 Elazığ earthquake, Turkey." Geophysical Journal International 223, no. 2 (2020): 1054–68. http://dx.doi.org/10.1093/gji/ggaa350.

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SUMMARY On 24 January 2020 an Mw 6.8 earthquake occurred at 20:55 local time (17:55 UTC) in eastern Turkey, close to the town of Sivrice in the Elazığ province, causing widespread considerable seismic damage in buildings. In this study, we analyse the main features of the rupture process and the seismic ground shaking during the Elazığ earthquake. We first use Interferometric Synthetic Aperture Radar (InSAR) interferograms (Sentinel-1 satellites) to constrain the fault geometry and the coseismic slip distribution of the causative fault segment. Then, we utilize this information to analyse the
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20

Li, Shuiping, Gang Chen, Tingye Tao, et al. "The 2019 Mw 6.4 and Mw 7.1 Ridgecrest earthquake sequence in Eastern California: rupture on a conjugate fault structure revealed by GPS and InSAR measurements." Geophysical Journal International 221, no. 3 (2020): 1651–66. http://dx.doi.org/10.1093/gji/ggaa099.

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SUMMARY On 4 and 6 July 2019, an Mw 6.4 foreshock and an Mw 7.1 main shock successively struck the city of Ridgecrest in eastern California. These two events are the most significant earthquake sequences to strike in this part of California for the past 20 yr. We used both continuous global positioning system (GPS) measurements and interferometric synthetic aperture radar (InSAR) images taken by the Sentinel-1 and ALOS-2 satellites in four different viewing geometries to fully map the coseismic surface displacements associated with these two earthquakes. Using these GPS and InSAR measurements
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21

Drożdżewski, Mateusz, and Krzysztof Sośnica. "Tropospheric and range biases in Satellite Laser Ranging." Journal of Geodesy 95, no. 9 (2021). http://dx.doi.org/10.1007/s00190-021-01554-0.

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AbstractThe Satellite Laser Ranging (SLR) technique provides very accurate distance measurements to artificial Earth satellites. SLR is employed for the realization of the origin and the scale of the terrestrial reference frame. Despite the high precision, SLR observations can be affected by various systematic errors. So far, range biases were used to account for systematic measurement errors and mismodeling effects in SLR. Range biases are constant for all elevation angles and independent of the measured distance to a satellite. Recently, intensity-dependent biases for single-photon SLR detec
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22

A. MAMMANO. "Observations of artificial satellites." Annals of Geophysics 17, no. 1 (2011). http://dx.doi.org/10.4401/ag-5199.

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23

G. Scalera. "Are artificial satellites orbits influenced by an expanding Earth?" Annals of Geophysics 49, no. 2-3 (2009). http://dx.doi.org/10.4401/ag-3118.

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24

Klopotek, Grzegorz, Thomas Hobiger, Rüdiger Haas, and Toshimichi Otsubo. "Geodetic VLBI for precise orbit determination of Earth satellites: a simulation study." Journal of Geodesy 94, no. 6 (2020). http://dx.doi.org/10.1007/s00190-020-01381-9.

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25

Otsubo, Toshimichi, and Graham M. Appleby. "System-dependent center-of-mass correction for spherical geodetic satellites." Journal of Geophysical Research: Solid Earth 108, B4 (2003). http://dx.doi.org/10.1029/2002jb002209.

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26

Petr, Štěpánek, Duan Bingbing, Filler Vratislav, and Hugentobler Urs. "Inclusion of GPS clock estimates for satellites Sentinel-3A/3B in DORIS geodetic solutions." Journal of Geodesy 94, no. 12 (2020). http://dx.doi.org/10.1007/s00190-020-01428-x.

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27

"Intercosmos/COSPAR symposium on use of artificial satellites for astronomy, geodesy and geophysics." COSPAR Information Bulletin 1985, no. 102 (1985): 13–14. http://dx.doi.org/10.1016/0045-8732(85)90006-3.

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28

Dequal, Daniele, Costantino Agnesi, David Sarrocco, et al. "100 kHz satellite laser ranging demonstration at Matera Laser Ranging Observatory." Journal of Geodesy 95, no. 2 (2021). http://dx.doi.org/10.1007/s00190-020-01469-2.

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AbstractThe new challenges related to the monitoring of Earth’s shape and motion have led the global geodetic observing system to set more stringent requirements on the precision and stability of the terrestrial reference frame (TRF). The achievement of this ambitious goal depends on the improvement of space geodesy techniques, satellite laser ranging (SLR) in particular, being the main instrument for TRF realization. In this work, we study the potential of very high repetition rate SLR by performing a data acquisition campaign with an Ekspla “Atlantic 60” 100 kHz repetition rate laser at the
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29

M. Caputo. "The set valued unified model of dispersion and attenuation for wave propagation in dielectric (and anelastic) media." Annals of Geophysics 41, no. 5-6 (1998). http://dx.doi.org/10.4401/ag-3809.

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Since the dispersion and attenuation properties of dielectric and anelastic media, in the frequency domain, are expressed by similar formulae, as shown experimentally by Cole and Cole (1941) and Bagley and Torvik (1983, 1986) respectively, we note that the same properties may be represented in the time domain by means of an equation of the same form; this is obtained by introducing derivatives of fractional order into the system functions of the media. The Laplace Transforms (LT) of such system functions contain fractional powers of the imaginary frequency and are, therefore, multivalued funct
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30

R. Leitinger. "Ionospheric electron content: the European perspective." Annals of Geophysics 41, no. 5-6 (1998). http://dx.doi.org/10.4401/ag-3816.

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The electron content of the ionosphere is an important quantity which indicates overall ionization. It is measured by means of propagation effects on radio signals which penetrate the ionosphere. In Europe relevant investigations started after the launch of the first artificial satellites. Soon the necessity arose to organize international cooperation: the regional as well as the global geographical distribution of ionization parameters is important knowledge for any meaningful geophysical interpretation of ionization parameters. Despite the fact that international scientific Unions and Commit
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31

Skorokhod, E. Yu, T. Ya Churilova, T. V. Efimova, N. A. Moiseeva, and V. V. Suslin. "Bio-Optical Characteristics of the Black Sea Coastal Waters near Sevastopol: Assessment of the MODIS and VIIRS Products Accuracy." Physical Oceanography 28, no. 2 (2021). http://dx.doi.org/10.22449/1573-160x-2021-2-215-227.

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Purpose. The purpose of the work is to evaluate accuracy of the satellite products for the coastal waters near Sevastopol, generated by the standard algorithms based on the MODIS and VIIRS (installed at the artificial Earth satellites Aqua and Terra, and at Suomi NPP, respectively) data. Methods and Results. In situ sampling was carried out at the station (44°37’26" N and 33°26’05" E) located at a distance of two miles from the Sevastopol Bay. The chlorophyll a concentration was measured by the spectrophotometric method. The spectral light absorption coefficients by optically active components
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