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| 1 | A multi-subwaveform parametric retracker of the radar satellite altimetric waveform and recovery of gravity anomalies over coastal oceans显示文摘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. | HWANG CheinWay | 2010 | Science China Earth Sciences2010，53，4： | 15 |
| 2 | On temporal-spatial distribution of backscatter coefficients over China determined by TOPEX/Poseidon mission显示文摘This paper deals with the backscatter coefficients known as sigma0 at Ku band and C band based on the GDR-M (Merged Geophysical Data Record) of TOPEX/Poseidon (T/P) through Jan.1993 to Dec.2004 over land surface of China.After smoothing and interpolating the backscatter coefficients for both bands, we achieve the 5′×5′ grid data and the time series of backscatter coefficients in 12 years.The spatial distribution of sigma0 over typical areas (wetland, desert, mountainous area, agriculture base, etc.) of Chinese territory is analyzed and discussed.The fast Fourier transformation (FFT) is used to detect the cycles of seasonal variations of sigma0 time series and gives that the annual period is the major cycle.Meanwhile a semiannual period is also found in some places.We use the least squares method on both periods and find that the amplitude of annual period is obviously greater than that of semi-annual period.The relationship among the anomalousness of time series, variations of environment and climate change, and the serious natural calamity (flood, drought) is also discussed.Data of topography slope extracted from SRTM are used to do correlation analysis with the backscatter coefficients in parts of China to quantify the impact of slope on backscatter coefficients in Ku and C bands, and the results show that they all have a negative correlation but the magnitudes are different in different places with different coverages.Such as the area of Liaoning and Jilin has the maximum correlation -0.56, the Taklimakan Desert has the minimum correlation -0.11, and the other places commonly have correlations in (-0.3, -0.5). | GUO JinYun YANG Lei LIU Xin HWANG CheinWay YANG Hong | 2012 | Science China Earth Sciences2012，55，12： | 6 |
| 3 | Analysis on motion of Earth’s center of mass observed with CHAMP mission显示文摘Geocenter motion (GCM) is one important topic for constructing and maintaining the terrestrial reference frame and its applications. GCM is studied from CHAMP with the multi-step approach in this paper. Geometric orbits of CHAMP in 2001-2006 are precisely determined with the kinematic method only from the satel-lite-borne GPS zero-difference data. Then a GCM time series is estimated from the precise kinematic orbits based on the theory of satellite dynamics to fit the CHAMP’s real geometric orbits. We compare the series with the geocenter series used in ITRF2005. Then the GCM series are analyzed with Fourier transform and wavelet transformation. The mean motions within 6 years in TX, TY and TZ direc-tions are respectively 0.8 mm, 2.2 mm, and 7.9 mm. The trends of GCM in the three directions are 0.495 mm/a, -0.004 mm/a, and 1.309 mm/a, respectively. The long-term movement (2001-2006) indicates that the crustal figure is changing. The seasonal variations are the main component which may be excitated by the mass redistribution of Earth’s fluid layer, e.g. ocean, atmosphere and continental water. The inter-annual variations are also found in the GCM series measured with CHAMP. | HWANG CheinWay | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，10： | 5 |
| 4 | Coastal Gravity Anomalies from Retracked Geosat/GM Altimetry: Improvement, Limitation and the Role of Airborne Gravity Data显示文摘 | Cheinway Hwang Jinyun Guo Xiaoli Deng Hsin-Ying Hsu Yuting Liu | 2006 | Journal of Geodesy2006，，4： | 1 |
| 5 | TOPEX/Poseidon observations of mesoscale eddies over the Subtropical Countercurrent:Kinematic characteristics of an anticyclonic eddy and a cyclonic eddy显示文摘 | HWANG Cheinway WU Chau-Ron KAO Richy | 2004 | J Geophys Res2004，109，08： | 1 |
| 6 | Invers vening meinesz formular and deflection-geoid formula: application to the prediction of gravity and geoid over the South China Sea显示文摘 | Hwang Cheinway | 1998 | Jounal of Geodesy1998，72，： | 1 |
| 7 | Circulations and eddies over the South China Sea derived from TOPEX/Posei- don altimetry 显示文摘 | HWANG CHEINWAY CHEN SUNG-AN | 2000 | Journal of Geophysical Research2000，105，10： | 1 |
| 8 | Precise orbit determination for the FORMOSAT-3/COSMIC satellite mission using GPS显示文摘 | Cheinway Hwang Tzu-Pang Tseng Tingjung Lin Dra?en ?vehla Bill Schreiner | 2009 | Journal of Geodesy2009，，5： | 1 |
| 9 | Coastal Gravity Anomalies from Retraeked Geosat/GM Altimetry: Improvement, Limitation and the Role of Airborne Gravity Data显示文摘 | HWANG Cheinway GUO Jinyun DENG Xiaoli | 2006 | Journal of Geodesy2006，80，4： | 1 |
| 10 | Sea ice concentration over the Antarctic Ocean from satellite pulse altimetry显示文摘Sea ice concentration (SIC) is an important parameter in characterizing sea ice. Limited by the environment and the spatial extent of observation, it is difficult for field work to meet the needs of a large-scale SIC study. However, with its many advantages, such as the ability to make large-scale, high-resolution and long-duration observations, the altimeter can be used to determine SIC on a large scale. Using the correspondence between the satellite pulse altimeter waveform and reflector property, waveform classification is employed. Moreover, this paper develops an algorithm to obtain the SIC from altimeter waveforms. In an actual computation, Pyrz Bay in the Antarctic is taken as an experimental region, and one-year and seasonal SICs are derived from ERS-1/GM waveforms over this study area. Furthermore, altimetric SICs are compared with those of SSMR SSM/I. The results show that the spatial distribution and the regions of maximum SIC determined employing these two methods are consistent. This demonstrates that altimeter data can be used to monitor sea ice. | YANG YuanDe E DongChen WANG ,HaiHong CHAO DingBo HWANG CheinWay LI Fei AI SongTao | 2011 | Science China Earth Sciences2011，54，1： | 1 |
| 11 | Coastal Gravity Anomalies from Retracked Geosat/GM Altime- try:Improvement, Limitation and the Role of Airborne Gravity Data 显示文摘 | HWANG CHEINWAY GUO JINYUN DENG XIAOLI | 2006 | Journal of Geodesy2006，80，4： | 1 |
| 12 | Coastal Gravity Anomalies from Retracked Geosat/GM Altimetry: Improvement, Limitation and the Role of Airborne Gravity Data显示文摘 | Cheinway Hwang Jinyun Guo Xiaoli Deng Hsin-Ying Hsu Yuting Liu | 2006 | Journal of Geodesy2006，，4： | 1 |
| 13 | Data reduction in scalar airborne gravimetry:Theory,software and case study in Taiwan显示文摘 | Cheinway Hwang Yu-Shen Hsiao Hsuan-Chang Shih | 2006 | Computers & Geosciences2006，32，10： | 1 |
| 14 | Fourier and Wavelet Analyses of TOPEX/Poseidon-derived Sea Level Anomaly over the South China Sea:a Contribution to the South China Sea Monsoon Experiment显示文摘 | Hwang Cheinway Chen Sungan | 2000 | Journal of Geophysical Research2000，105，28： | 1 |
| 15 | Lake Level Variation in China from TOPEX/POSEIDON Altimetry:Data Quality Assessment and Links to Precipitation and ENSO显示文摘 | Hwang Cheinway Peng Mingfong Ning Jingsheng | 2005 | Geophys J Int2005，161，： | 1 |
| 16 | Coastal Gravity Anomalies from Retracked Geosat/GM Altimetry: Improvement, Limitation and the Role of Airborne Gravity Data显示文摘 | Cheinway Hwang Jinyun Guo Xiaoli Deng Hsin-Ying Hsu Yuting Liu | 2006 | Journal of Geodesy2006，，4： | 1 |
| 17 | Coastal Gravity Anomalies from Retracked Geosat/GM Altimetry: Improvement, Limitation and the Role of Airborne Gravity Data显示文摘 | Cheinway Hwang Jinyun Guo Xiaoli Deng Hsin-Ying Hsu Yuting Liu | 2006 | Journal of Geodesy2006，，4： | 1 |
| 18 | Quality assessment of FORMOSAT-3/COSMIC and GRACE GPS observables: analysis of multipath, ionospheric delay and phase residual in orbit determination显示文摘 | Cheinway Hwang Tzu-Pang Tseng Ting-Jung Lin Dra?en ?vehla Urs Hugentobler Benjamin Fong Chao | 2010 | GPS Solutions2010，，1： | 1 |
| 19 | Quality Assessment of FORMOSAT-3/COSMIC and GRACE GPS Observables: Analysis of Muhipath, Ionospheric Delay and Phase Residual in Orbit Determination 显示文摘 | CHEINWAY HWANG TZUPANG TSENG LIN Ting-jun | 2010 | GPS Solution2010，20，14： | 1 |
| 20 | Data reduction in scalar airborne gravimetry: Theory, software and case study in Taiwan显示文摘 | Cheinway Hwang Yu-Shen Hsiao Hsuan-Chang Shih | 2006 | Computers and Geosciences2006，，10： | 1 |
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