Analysis on motion of Earth’s center of mass observed with CHAMP mission

Guo, Jinyun; Han, Yulei; Hwang, Cheinway

doi:10.1007/s11433-008-0152-0

Cited by 14 publications

(8 citation statements)

References 19 publications

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“…A third method is the dynamic approach that uses a reference frame fixed on the surface of the Earth and estimates three n = 1 geopotential coefficients at regular intervals (Kar, 1997;Pavlis, 1999;Guo et al, 2008). Because of complications associated with dynamic parameter implementation and the non-inertial frame, it has not been used widely.…”

Section: Translational Approachesmentioning

confidence: 99%

Geocenter motion and its geodetic and geophysical implications

Ray

Dam

2012

Journal of Geodynamics

124

117

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a b s t r a c tThe horizontal transport of water in Earth's surface layer, including sea level change, deglaciation, and surface runoff, is a manifestation of many geophysical processes. These processes entail ocean and atmosphere circulation and tidal attraction, global climate change, and the hydrological cycle, all having a broad range of spatiotemporal scales. The largest atmospheric mass variations occur mostly at synoptic wavelengths and at seasonal time scales. The longest wavelength component of surface mass transport, the spherical harmonic degree-1, involves the exchange of mass between the northern and southern hemispheres. These degree-1 mass loads deform the solid Earth, including its surface, and induce geocenter motion between the center-of-mass of the total Earth system (CM) and the center-of-figure (CF) of the solid Earth surface. Because geocenter motion also depends on the mechanical properties of the solid Earth, monitoring geocenter motion thus provides an additional opportunity to probe deep into Earth's interior. Most modern geodetic measurement systems rely on tracking data between ground stations and satellites that orbit around CM. Consequently, geocenter motion is intimately related to the realization of the International Terrestrial Reference Frame (ITRF) origin, and, in various ways, affects many of our measurement objectives for global change monitoring. In the last 15 years, there have been vast improvements in geophysical fluid modeling and in the global coverage, densification, and accuracy of geodetic observations. As a result of these developments, tremendous progress has been made in the study of geocenter motion over the same period. This paper reviews both the theoretical and measurement aspects of geocenter motion and its implications.

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Section: Translational Approachesmentioning

confidence: 99%

Geocenter motion and its geodetic and geophysical implications

Ray

Dam

2012

Journal of Geodynamics

124

117

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“…Because the sea surface calculated from altimetric data is not smooth, the Gaussian filter [7,26] is used to filter SSH data. The size of filtering window affects the smooth of sea surface.…”

Section: Practical Computation Of Gravity Anomaly Over Coastal Seas Amentioning

confidence: 99%

A multi-subwaveform parametric retracker of the radar satellite altimetric waveform and recovery of gravity anomalies over coastal oceans

Guo

Gao

Hwang³

et al. 2009

Sci. China Earth Sci.

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The quality of satellite radar altimetric data is very important in studies of geodesy, geophysics, and oceanography. Over coastal oceans, altimeter waveforms are contaminated by the terrain and physical environments so that the accuracy of altimeter data is lower than that over open oceans. Here we develop a new multi-subwaveform parametric retracker (MSPR) to improve the quality of altimeter data for the recovery of gravity anomaly in coastal oceans. The least squares collocation method is used to recover the residual gravity anomaly over the coastal water from altimetric data. The waveform data records from Geosat/GM around Taiwan Island are practically retracked with MSPR. When compared with the Taiwan geoid height, the results retracked by MSPR are more accurate than those retracked by the well-known β-5-parmeter method and from the geophysical data records (GDRs). The gravity anomalies over Taiwan coastal waters are calculated from the retracked altimeter data with the least squares collocation. When we compared gravity anomalies computed using altimeter GDRs with the ship-borne gravity data over Taiwan coastal ocean, we found that the results from retracked data are more accurate than those from GDRs. multi-subwaveform parametric retracker, waveform retracking for radar satellite altimetry, gravity anomaly, least squares collocation, Geosat/GM Citation:Guo J Y, Gao Y G, Hwang C W, et al. A multi-subwaveform parametric retracker of the radar satellite altimetric waveform and recovery of gravity anomalies over coastal oceans.

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“…CHAMP is a small satellite mission for geoscience research, atmospheric studies, and applications headed by the German Research Centre for Geosciences (GFZ) (GFZ 2018; Guo et al 2008). As a near-polar, low Earth orbit satellite equipped with high-precision, multifunction, completely satellite-borne instruments (magnetometer, accelerometer, STAR sensor, GPS receiver, laser mirror, ion drift meter).…”

Section: Germany's Satellitesmentioning

confidence: 99%

Remote Sensing Satellites for Digital Earth

Chen

et al. 2019

Manual of Digital Earth

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The term remote sensing became common after 1962 and generally refers to nonintrusive Earth observation using electromagnetic waves from a platform some distance away from the object of the study. After more than five decades of development, humankind can now use different types of optical and microwave sensors to obtain large datasets with high precision and high resolution for the atmosphere, ocean, and land. The frequency of data acquisition ranges from once per month to once per minute, the spatial resolution ranges from kilometer to centimeter scales, and the electromagnetic spectrum covers wavebands ranging from visible light to microwave wavelengths. Technological progress in remote sensing sensors enables us to obtain data on the global scale, remarkably expanding humanity's understanding of its own living environment from spatial and temporal perspectives, and provides an increasing number of data resources for Digital Earth. This chapter introduces the developments and trends in remote sensing satellites around the world. Keywords Remote sensing • Digital Earth • Satellite • Earth observation 3.1 Development of Remote Sensing Remote sensing is a core technology for Earth observation. It covers information collection, in-orbit processing, information storage and transmission, ground reception, processing for applications, calibration, verification, applied research, and basic research, providing fundamental data resources for Digital Earth (Guo 2012).

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Analysis on motion of Earth’s center of mass observed with CHAMP mission

Cited by 14 publications

References 19 publications

Geocenter motion and its geodetic and geophysical implications

Geocenter motion and its geodetic and geophysical implications

A multi-subwaveform parametric retracker of the radar satellite altimetric waveform and recovery of gravity anomalies over coastal oceans

Remote Sensing Satellites for Digital Earth

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