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| 1 | A novel satellite-equipped receiver for autonomous monitoring of GNSS navigation signal quality显示文摘Global navigation satellite system(GNSS) comes with potential unavoidable application risks such as the sudden distortion or failure of navigation signals because its satellites are generally operated until failure. In order to solve the problems associated with these risks, receiver autonomous integrity monitoring(RAIM) and ground-based signal quality monitoring stations are widely used. Although these technologies can protect the user from the risks, they are expensive and have limited region coverage. Autonomous monitoring of satellite signal quality is an effective method to eliminate these shortcomings of the RAIM and ground-based signal quality monitoring stations; thus, a new navigation signal quality monitoring receiver which can be equipped on the satellite platform of GNSS is proposed in this paper. Because this satellite-equipped receiver is tightly coupled with navigation payload, the system architecture and its preliminary design procedure are first introduced. In theory, code-tracking loop is able to provide accurate time delay estimation of received signals. However, because of the nonlinear characteristics of the navigation payload, the traditional code-tracking loop introduces errors. To eliminate these errors, the dummy massive parallel correlators(DMPC) technique is proposed. This technique can reconstruct the cross correlation function of a navigation signal with a high code phase resolution. Combining the DMPC and direct radio frequency(RF) sampling technology, the satellite-equipped receiver can calibrate the differential code bias(DCB) accurately. In the meantime, the abnormities and failures of navigation signal can also be monitored. Finally, the accuracy of DCB calibration and the performance of fault monitoring have been verified by practical test data and numerical simulation data, respectively. The results show that the accuracy of DCB calibration is less than 0.1 ns and the novel satellite-equipped receiver can monitor the signal quality effectively. | YANG Jian YANG YiKang LI Ji Sheng LI HengNian YANG TianShe | 2016 | Science China(Technological Sciences)2016，59，7： | 6 |
| 2 | Method of Satellite Fault Diagnosis Based on Bayesian Network显示文摘Based on Bayesian network, a new method to diagnose satellite faults is presented. The Bayesian network model of physical processing of satellite is developed; the main ideas of Bayesian network model of satellite fault diagnosis are introduced; the method to make the symptom variables values into discrete forms is proposed; one example is given to illustrate the application of Bayesian network model for satellite fault diagnosis. | Yang Tianshe Li Jisheng Huang Yongxuan | 2005 | 工程科学(英文版)2005，3，3： | 3 |
| 3 | Method to Realize TT&C of Spacecraft In-Orbit from Ground-Based to Space-Ground-Based Mode显示文摘Currently, TT&C of spacecraft is performed by a ground system. Because more and more spacecrafts are launched into orbits, it is difficult for the ground system to meet the TT&C requirements of the spacecrafts. To explore a new, effective and economical TT&C mode is absolutely necessary. A method is proposed to use SGBM mode in TT&C spacecrafts in low earth orbits, here. Firstly, the principle of the mode is discussed; secondly, the system to simulate the mode is designed; thirdly, the relative issues to use the mode are indicated; fourthly, the experimental results (simulation) to apply the mode to TT&C spacecrafts are analyzed; and finally dawn is the main conclusion of the method. | Yang Tianshe~ 1,2 , Xiaoshe Dong~1, Huang Yongxuan~1(1. Xi’an Jiaotong University,Xi’an 710049, Shaanxi Province 2. Xi’an Satellite Control Center, Xi’an 710049, Shaanxi Province) | 2007 | 工程科学(英文版)2007，5，2： | 1 |
| 4 | Water-soluble NaYF4 : Yb/Er upconversion nanophosphors: Synthesis, characteristics and application in bioimaging显示文摘 | Cao Tianye Yang Tianshe Gao Yuan et aI | 2010 | Inorg Chem Commun2010，13，： | 1 |
| 5 | Cubic sub-20 nm NaLuF 4 -based upconversion nanophosphors for high-contrast bioimaging in different animal species显示文摘 | Tianshe Yang Yun Sun Qian Liu Wei Feng Pengyuan Yang Fuyou Li | 2012 | Biomaterials2012，，14： | 1 |
| 6 | Analysis of noncommensurate sampling effects on the performance of PN code tracking loops显示文摘Noncoherent early-late processing(NELP) code tracking loops are often implemented using digital hardware for digital global positioning system(GPS) receivers. Noncommensurate sampling technology is widely used because it is viewed as an effective solution to cope with the drawback of digital effects. However, the relationship between the sampling rate and auto-correlation function(ACF) is not adequately characterized by traditional analysis. The principles for selecting the sampling rate are still not apparent. In order to solve this problem, we first analyzed the effects of different sampling rates on ACF and obtained the analytical form of a discrete auto-correlation function(DACF) for a noncommensurate sampling rate. Based on the result, the relationship between the step variation in DACF and NELP parameters such as sampling rate, integration time, and correlator spacing was determined. The maximum step variation size of DACF was also determined. However, considering the actual situation, additional factors such as code Doppler shift, precorrelation filter, and thermal noise may degrade the step variation of DACF. The relationship between the step variation and these factors was analyzed separately. An appropriate sampling rate and appropriate correlator spacing were proposed to achieve the typical accuracy of measurement. The numerical simulation verified the validity of the above theoretical analyses, and finally, the conclusions and design constraints for the digital GPS receiver are summarized. | YANG Jian YANG YiKang LI JiSheng LI HengNian YANG TianShe | 2018 | Science China(Technological Sciences)2018，61，6： | 1 |
| 7 | Method to Identify Similarity and Dissimilarity between Systems Engineering and Neighboring Disciplines显示文摘Systems engineering is not a new discipline. However, up to now, there is little consensus on its exact definition and scope. The scopes of several disciplines (neighboring disciplines of systems engineering) overlap with that of systems engineering. In this paper, the methods to identify similarities and dissimilarities between systems engineering and its neighboring disciplines are discussed. The research of this paper is expected to be helpful for clarifying the definition and scope of systems engineering. | Yang Tianshe Dong Xiaoshe Li Jisheng Sun Yanhong | 2007 | 工程科学(英文版)2007，5，1： | 0 |
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