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| 1 | Orbit determination and time synchronization for BDS-3 satellites with raw inter-satellite link ranging observations显示文摘To provide competitive global positioning and timing services under the condition that monitoring stations are confined to Chinese territory,inter-satellite link(ISL)technology is used by the third-generation BeiDou Navigation Satellite System(BDS-3).The ISL,together with the dual one-way links between satellites and anchor stations,may enable autonomous navigation for BDS-3.In this paper,we propose a general observation model for orbit determination(OD)and time synchronization(TS)directly using non-simultaneous observations,such as raw ISL pseudoranges.With the proposed model,satellite orbits,clocks,and hardware delay biases of ISL equipment can be determined simultaneously by jointly processing inter-satellite one-way pseudorange data and observation data from ground monitoring stations.Moreover,autonomous OD and TS are also achievable with one-way pseudorange data from anchor stations and satellites.Data from eight BDS-3 satellites,two anchor stations,and seven monitoring stations located in China were collected to validate the proposed method.It is shown that by jointly processing data from the ISL and seven monitoring stations,the RMS of overlap orbit differences in radial direction is 0.019 m,the overlap clock difference(95%)is 0.185 ns,and the stability of the estimated hardware delay biases for each satellite is greater than 0.5 ns.Compared with the results obtained with the seven stations,the improvements of orbits in radial direction and clocks are 95.7%and 90.5%,respectively.When the hardware delay biases are fixed to predetermined values,the accuracies of orbits and clocks are further improved.By jointly processing pseudoranges from the satellites and the two anchor stations,the RMS of overlap orbit differences is 0.017 m in the radial direction,and the overlap clock difference(95%)is 0.037 ns.It has also been demonstrated that under the condition of one-way ranging links,the accuracies of orbits and clocks obtained by the above two modes are still significantly better than those obtained by using the data from the monitoring stations alone. | Rengui Ruan Xiaolin Jia Laiping Feng Jun Zhu Zongbo Huyan Jie Li Ziqing Wei | 2020 | Satellite Navigation2020，1，1： | 5 |
| 2 | Satellite Positioning and Orbit Determination System(SPODS):Introduction and Evaluation显示文摘The Satellite Positioning and Orbit Determination System(SPODS)is a software package for GNSS positioning/orbit determination,developed by the Xi’an Research Institute of Surveying and Mapping.So far it has been able to analyse GPS data and has the capability of high precision GPS positioning and orbit determination.The underlying theory and the performance evaluation are briefly addressed in this paper.The experiments are carried out with GPS data collected from about 127 IGS stations during 4~10 January 2009.The results show that the RMS 1D difference is 1.1 cm between SPODS orbits and final IGS combined orbits,and that the repeatability of daily solutions of station coordinates is 1.5 mm for horizontal components,and 4.5 mm for vertical component,and that the consistency of ERP solutions with IGS final products is 0.025 mas,0.093 mas and 0.013 ms/d respectively for pole coordinates and LOD. | Ziqing WEI Rengui RUAN Xiaolin JIA Xianbing WU Xiaoyong SONG Yue MAO Laiping FENG Yongxing ZHU | 2018 | Journal of Geodesy and Geoinformation Science2018，1，1： | 4 |
| 3 | EXISTENCE OF MULTIPLE POSITIVE SOLUTIONS TO SINGULAR SECOND ORDER NEUMANN BOUNDARY VALUE PROBLEMS显示文摘Using the fixed point index in cones, we study the existence of one and two positive solutions to singular second order Neumann boundary value problems under some conditions, which concerns the first eigenvalue of the relevant linear problem. Our results improve and extend some known ones in the previous literature. | Xiangping Chen, Rengui Li (Dept. of Math., Jining University, Qufu 273155, Shandong) | 2010 | Annals of Differential Equations2010，26，2： | 3 |
| 4 | Uncombined precise orbit and clock determination of GPS and BDS-3显示文摘There is increasing concern about the uncombined(UC)observation model in the field of global navigation satellite system(GNSS).Based on the global positioning system(GPS)and the third-generation BeiDou navigation satellite system(BDS-3),this study processed the UC precision orbit determination(POD)for single and dual systems.First,a UC observation model suitable for multi-GNSS POD was derived,and the ionospheric-free(IF)combination observation model was presented.Although the ambiguity parameters of UC and IF strategies were different after reparameterization,the difference could be removed when processing ambiguity resolution,and the equivalence was proved theoretically.To demonstrate the accuracy of BDS-3 orbits fully,the observation data of approximately 1 month were selected for determining the precise orbit for global positioning system(GPS)only,BDS-3 only,and GPS/BDS-3 systems based on the UC and IF models.The orbit precision of BDS-3 satellites was validated by using metrics,including comparison with precision products released by Wuhan University,orbit boundary discontinuity,and satellite laser ranging(SLR)residuals.The results show that the orbit accuracies of the IF and UC models are almost the same,the difference in orbits is approximately several millimeters,and the clock difference is within 0.01 ns.The GPS/BDS-3 combined solution shows better accuracy compared to other solutions.The average accuracies in the R and 3D directions are approximately 4 and 15 cm,and the clock standard deviation is approximately 0.2 ns compared to external orbit product.The root mean square of SLR residuals is approximately 4 cm. | Tian Zeng Lifen Sui Rengui Ruan Xiaolin Jia Laiping Feng | 2020 | Satellite Navigation2020，1，1： | 2 |
| 5 | BUCKLING AND POSTBUCKLING ANALYSIS OF ELASTO-PLASTIC FIBER METAL LAMINATES显示文摘The elasto-plastic buckling and postbuckling of fiber metal laminates(FML) are studied in this research. Considering the geometric nonlinearity of the structure and the elastoplastic deformation of the metal layers, the incremental Von Karman geometric relation of the FML with initial deflection is established. Moreover, an incremental elasto-plastic constitutive relation adopting the mixed hardening rule is introduced to depict the stress-strain relationship of the metal layers. Subsequently, the incremental nonlinear governing equations of the FML subjected to in-plane compressive loads are derived, and the whole problem is solved by the iterative method according to the finite difference method. In numerical examples, the effects of the initial deflection,the loading state, and the geometric parameters on the elasto-plastic buckling and postbuckling of FML are investigated, respectively. | Rengui Bi Yiming Fu Yanping Tian Chao Jiang | 2014 | Acta Mechanica Solida Sinica2014，27，1： | 2 |
| 6 | The in fluence of barriers on flame and explosion wave in gas explosion 显示文摘 | Lin Baiquan Zhou Shining Zhang Rengui | 1998 | Journal of Coal Science and Engineering1998，4，2： | 1 |
| 7 | Analysis of the Key Factors Affecting the Energy Efficiency of Batteries in Electric Vehicle显示文摘 | Lu Rengui Yang Aochi Xue Yufeng | 2011 | World Electric Vehicle Journal2011，4，1： | 1 |
| 8 | Preparation and characterization of ramsdellite Li2Ti3O7 as an anode material for asymmetric supercapacitors显示文摘 | Fang Chen Rengui Li | 2005 | Electrochimica Acta2005，51，： | 1 |
| 9 | Structural reliability analysis using non-probabilistic convex model 显示文摘 | JIANG Chao BI Rengui LU Guoying | 2013 | Computer Methods in Applied Mechanics and Engineering2013，254，： | 1 |
| 10 | Relaxation Model of the Opencircuit Voltage for State-of-charge Estimation in Lithium-ion Batteries显示文摘 | Pei Lei Lu Rengui Zhu Chunbo | 2013 | IET Electrical Systems in Transportation2013，3，4： | 1 |
| 11 | Effects of early treatment with growth hormone on ijfarct size, survival, and cardiac gene expression after acute myocardial infarction显示文摘 | Hongkui J Rengui Y Hsienwie L | 2002 | Growth Horm IGF Res2002，12，： | 1 |
| 12 | Effects of Ca-based additives on desulfurization during coal pyrolysis显示文摘 | Rengui Guan Wen Li Baoqing Li | 2003 | Fuel2003，，15： | 1 |
| 13 | Value of ACTH in children with Corticoiddependent nephrosis显示文摘 | Yue Zhihui Chen Shumei Wei Rengui | 2005 | 9th Asian Congress of Pediatric Nephrology2005，9091，： | 1 |
| 14 | Tunnel morphology of aluminum foil etched by a two-step DC etching method显示文摘 | Rengui Xiao Kangping Yan | 2008 | Corrosion Science2008，，11： | 1 |
| 15 | 显示文摘 | Guan Rengui Li Wen Li Baoqing | 2003 | Fuel2003，82，1517： | 1 |
| 16 | Effect of substrate temperature on the microstructure, op- tical, and electrical properties of reactive DC magnetron sputtering vanadium oxide films 显示文摘 | Zhang Dongping Huang Rengui Zhang Ting | 2012 | Physics Status Soli- di A2012，209，11： | 1 |
| 17 | The logical connection between special relativity and thermodynamics 显示文摘 | | 1996 | Eur J Phys1996，，17： | 1 |
| 18 | NONLINEAR DYNAMIC INSTABILITY OF DOUBLE-WALLED CARBON NANOTUBES UNDER PERIODIC EXCITATION显示文摘A multiple-elastic beam model based on Euler-Bernoulli-beam theory is presented to investigate the nonlinear dynamic instability of double-walled nanotubes.Taking the geometric nonlinearity of structure deformation,the effects of van der Waals forces as well as the non-coaxial curvature of each nested tube into account,the nonlinear parametric vibration governing equations are derived.Numerical results indicate that the double-walled nanotube(DWNT) can be considered as a single column when the van der Waals forces are suffciently strong.The stiffness of medium could substantially reduce the area of the nonlinear dynamic instability region,in particular,the geometric nonlinearity can be out of account when the stiffness is large enough.The area of the principal nonlinear instability region and its shifting distance aroused by the nonlinearity both decrease with the increment of the aspect ratio of the nanotubes. | Yiming Fu Rengui Bi Pu Zhang | 2009 | Acta Mechanica Solida Sinica2009，22，3： | 1 |
| 19 | Study on production of aerated concrete by circulating fluidized bed fly ash 显示文摘 | Xinzhong Liu Rengui Wen Zhuxing Chen | 2009 | Acta Scientiarum Naturalium Universitatis Sunytseni2009，48，2： | 1 |
| 20 | The release of nitrogen species during of model char loaded with differ-ent additives显示文摘 | Guan Rengui Li Wen Chen Haokan | 2004 | Fuel Processing Technology2004，85，8910： | 1 |
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