Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG

Qingdao, China

Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG

Qingdao, China
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Guo J.-Y.,Shandong University of Science and Technology | Guo J.-Y.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Wang S.-Y.,Shandong University of Science and Technology | Liu X.,Shandong University of Science and Technology | And 3 more authors.
China Ocean Engineering | Year: 2015

As a new remote sensing technology, the global navigation satellite system (GNSS) reflection signals can be used to collect the information of ocean surface wind, surface roughness and sea surface height. Ocean altimetry based on GNSS reflection technique is of low cost and it is easy to obtain large amounts of data thanks to the global navigation satellite constellation. We can estimate the sea surface height as well as the position of the specular reflection point. This paper focuses on the study of the algorithm to determine the specular reflection point and altimetry equations to estimate the sea surface height over the reflection region. We derive the error equation of sea surface height based on the error propagation theory. Effects of the Doppler shift and the size of the glistening zone on the altimetry are discussed and analyzed at the same time. Finally, we calculate the sea surface height based on the simulated GNSS data within the whole day and verify the sea surface height errors according to the satellite elevation angles. The results show that the sea surface height can reach the precision of 6 cm for elevation angles of 55° to 90°, and the theoretical error and the calculated error are in good agreement. © 2015, Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg.


Guo J.Y.,Shandong University of Science and Technology | Guo J.Y.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Guo J.Y.,CAS National Astronomical Observatories | Yang L.,Shandong University of Science and Technology | And 4 more authors.
Science China Earth Sciences | Year: 2012

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). © 2012 Science China Press and Springer-Verlag Berlin Heidelberg.


Guo J.-Y.,Shandong University of Science and Technology | Guo J.-Y.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Chen Y.-N.,Shandong University of Science and Technology | Liu X.,Shandong University of Science and Technology | And 2 more authors.
China Ocean Engineering | Year: 2013

Distance between the main land and island is so long that it is very difficult to precisely connect the height datum across the sea with the traditional method like the trigonometric leveling, or it is very expensive and takes long time to implement the height transfer with the geopotential technique. We combine the data of GPS surveying, astro-geodesy and EGM2008 to precisely connect the orthometric height across the sea with the improved astronomical leveling method in the paper. The Qiongzhou Strait is selected as the test area for the height connection over the sea. We precisely determine the geodetic latitudes, longitudes, heights and deflections of the vertical for four points on both sides across the strait. Modeled deflections of the vertical along the height connecting routes over the sea are determined with EGM2008 model based on the geodetic positions and heights of the sea segmentation points from DNSC08MSS model. Differences of the measured and modeled deflections of the vertical are calculated at four points on both sides and linearly change along the route. So the deflections of the vertical along the route over the sea can be improved by the linear interpolation model. The results are also in accord with those of trigonometirc levelings. The practical case shows that we can precisely connect the orthometric height across the Qiongzhou Strait to satisfy the requirement of order 3 leveling network of China. The method is very efficient to precisely connect the height datum across the sea along the route up to 80 km. © 2013 Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg.


Guo J.-Y.,Shandong University of Science and Technology | Guo J.-Y.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Qin J.,Shandong University of Science and Technology | Qin J.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | And 3 more authors.
Applied Geophysics | Year: 2012

The HY-2 satellite carrying a satellite-borne GPS receiver is the first Chinese radar altimeter satellite, whose radial orbit determination precision must reach the centimeter level. Now HY-2 is in the test phase so that the observations are not openly released. In order to study the precise orbit determination precision and procedure for HY-2 based on the satellite-borne GPS technique, the satellite-borne GPS data are simulated in this paper. The HY-2 satellite-borne GPS antenna can receive at least seven GPS satellites each epoch, which can validate the GPS receiver and antenna design. What's more, the precise orbit determination processing flow is given and precise orbit determination experiments are conducted using the HY-2-borne GPS data with both the reduced-dynamic method and the kinematic geometry method. With the 1 and 3 mm phase data random errors, the radial orbit determination precision can achieve the centimeter level using these two methods and the kinematic orbit accuracy is slightly lower than that of the reduced-dynamic orbit. The earth gravity field model is an important factor which seriously affects the precise orbit determination of altimeter satellites. The reduced-dynamic orbit determination experiments are made with different earth gravity field models, such as EIGEN2, EGM96, TEG4, and GEMT3. Using a large number of high precision satellite-borne GPS data, the HY-2 precise orbit determination can reach the centimeter level with commonly used earth gravity field models up to above 50 degrees and orders. © 2012 Editorial Office of Applied Geophysics and Springer-Verlag Berlin Heidelberg.


Wang J.,Shandong University of Science and Technology | Wang J.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Guo J.,Shandong University of Science and Technology | Guo J.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | And 2 more authors.
Open Civil Engineering Journal | Year: 2015

In this paper , we proposed a new method to build covariance matrix of gravity anomaly based on the spherical harmonic expansion of gravity anomaly , and then combined with the measured gravity data we can realize the fast and high precision interpolation and extrapolation of gravity anomaly according to the principle of least squares and the remove-compute-restore technique. The feasibility of this method is proved through the simulation experiment. © Wang et al.; Licensee Bentham Open.


Guo J.-Y.,Shandong University of Science and Technology | Guo J.-Y.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Li G.-W.,Shandong University of Science and Technology | Li G.-W.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | And 4 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

Most GPS positioning errors can be eliminated or removed by the differential technique or the modeling method, but the multipath effect is a special kind of system or gross error, so it is difficult to be simulated or eliminated. In order to improve the accuracy of GPS positioning, the single-epoch pseudorange multipath effects at GPS station were calculated, and firstly modeled based on the spherical cap harmonic (SCH), which is the function of satellite longitude and latitude with the robust method. The accuracy of the kinematic point positioning technique was improved by correcting pseudorange observations with the multipath effect calculated by the SCH model, especially in the elevation direction. The spherical cap harmonic can be used to model the pseudorange multipath effect. © 2014 The Nonferrous Metals Society of China.


Guo J.,Shandong University of Science and Technology | Guo J.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Wang S.,Shandong University of Science and Technology | Wang S.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | And 4 more authors.
Applied Mechanics and Materials | Year: 2012

The local quasi-geoid model up to centimeter precision has became the basic requirement for the development of modern surveying and mapping science. There are a variety of models can be used for the quasi-geoid refinement, including the spherical cap harmonic model (SCH). This paper studies the theory of SCH to get the spherical cap harmonic expression to fit the height anomaly in the least squares sense, which is to achieve the transformation between the geodetic height and the normal height. We also discuss the selection of the maximum model degree in local region. The practical case is studied to refine the local quasi-geoid model with SCH using GPS/leveling data at 85 points. The results indicate that the local quasi-geoid model can reach 3 centimeter-level at the internal and external fitting precision. © (2012) Trans Tech Publications, Switzerland.


Kong Q.,Shandong University of Science and Technology | Kong Q.,Chinese Academy of Sciences | Kong Q.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Guo J.,Shandong University of Science and Technology | And 4 more authors.
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2013

In order to achieve the centimeter-level precise orbit determination for the HY-2 satellite, the methods of orbit determination based on DORIS and SLR are discussed. We have simulated DORIS and SLR observation data for the HY-2 satellite, defined the methods and processes of precise orbit determination. In addition we have discussed the orbit determination accuracy using simulated data given different observation errors, and analyzed the impact of different distribution of ground beacons on orbit determination accuracy and consuming time. In order to obtain more accuracy results, we also analyzed the effect of two observation technique weights on orbit determination accuracy. Experiment results indicate that the optimization of beacon stations can significantly improve the orbit determination precision and save consuming time. Reasonable weights on a variety of technology measurements can make the accuracy of result to achieve the best during the integrated technology orbit determination, if we give DORIS and SLR observations 0.3 mm/s and 10 mm weights respectively, and the obit determination accuracy can achieve centimeter level.


Guo J.,Shandong University of Science and Technology | Guo J.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Liu X.,Shandong University of Science and Technology | Chen Y.,Shandong University of Science and Technology | And 2 more authors.
Marine Geophysical Research | Year: 2014

Heights as the basic geographical information are very important to study marine geophysics, geodesy and oceanography. Based on the astronomical leveling principle, we put forward a new method to unify the normal height (NH) datum along one ship route across sea with the ship-borne gravimetry and global navigation satellite system (GNSS) techniques. Ship-borne gravimeter can precisely measure gravity anomalies and the GNSS technique is used to measure precise sea surface heights (SSHs) along the ship track across sea. Precisions of ship-borne gravities and SSHs are improved with the colinear adjustment. To remove the effects of sea wave and wind, the Gaussian filter is used to filter residuals both between the ship-borne and modeled gravities from EGM2008 to degree 2160, and the measured and modeled SSHs from DTM10MSS, respectively. Deflections of the vertical (DOVs) along the ship route are estimated from the measured gravities with the least squares collocation method. The astro-geodetic survey is made on continent and island to improve the accuracy of DOVs along the route. We use the new method to connect NHs on the coastal sea of Shandong Peninsula, China. The results indicate that the method is very efficient to precisely connect the NH along the ship route across sea. © 2014 Springer Science+Business Media Dordrecht.


Guo J.,Shandong University of Science and Technology | Guo J.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | Mu D.,Shandong University of Science and Technology | Mu D.,Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG | And 4 more authors.
Acta Geophysica | Year: 2014

The Level-2 monthly GRACE gravity field models issued by Center for Space Research (CSR), GeoForschungs Zentrum (GFZ), and Jet Propulsion Laboratory (JPL) are treated as observations used to extract the equivalent water height (EWH) with the robust independent component analysis (RICA). The smoothing radii of 300, 400, and 500 km are tested, respectively, in the Gaussian smoothing kernel function to reduce the observation Gaussianity. Three independent components are obtained by RICA in the spatial domain; the first component matches the geophysical signal, and the other two match the north-south strip and the other noises. The first mode is used to estimate EWHs of CSR, JPL, and GFZ, and compared with the classical empirical decorrelation method (EDM). The EWH STDs for 12 months in 2010 extracted by RICA and EDM show the obvious fluctuation. The results indicate that the sharp EWH changes in some areas have an important global effect, like in Amazon, Mekong, and Zambezi basins. © 2014 Versita Warsaw and Springer-Verlag Wien.

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