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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 | Palestinian Refugees in Arab Countries and Their Impacts显示文摘Apart from West Bank and Gaza Strip,it is the Arab countries that most Palestinian refugees seek shelter in.These Palestinian refugees not only live a hard life,but also are put into an awkward situation.The denial of Palestinian refugees’right of return from the Israeli government,the economic weakness of Palestine and interest consideration of Arab countries contributed to the suspense of the solution to the Palestinian refugee problem.The presence and continuation of the problem have great impacts on the nation and state-building of Palestine and those Arab countries sheltering the Palestinian refugees.The final solution depends on the support from Arab countries. | Tianshe Chen | 2009 | Asian Journal of Middle Eastern and Islamic Studies2009，3，3： | 0 |
| 8 | 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 |
| 9 | Exploration of the Hamas Suicide Attacks显示文摘The majority of the Hamas suicide attacks were carried out by young fellows.There were various motivations for the suicide attacks,including four social factors.Firstly,the miserable experiences of the Palestinian people became a hotbed for the suicide attackers.Secondly,the wide public sympathy of suicide attackers among the Palestinian people provided support for Hamas and the suicide attacks.Thirdly,the Palestinians turned to violence as a last resort from the disappointment of the Palestinian-Israeli peace process.Finally,the Hamas suicide attacks had many religious factors.The Hamas suicide attack has two effects.One is that it causes the Palestinians and Israelis to fall into a vicious circle of’’violence to violence’’;however it also strengthens Hamas’s leading position as a resistant organization.Another is that it has caused the martyrdom culture to become popular in Palestine and inspired many Palestinians to join suicide attacks.In conclusion,the roots of the suicide attacks by Hamas and other Palestinian groups are found in Palestinian despair of the status quo and therefore,the Palestine issue has still not been resolved. | CHEN Tianshe | 2012 | Asian Journal of Middle Eastern and Islamic Studies2012，6，2： | 0 |
| 10 | Four Points toward the Understanding of Egypt’s Foreign Relations显示文摘To understand and perceive the foreign relations of contemporary Egypt,the focus must be placed on four essential starting points,namely,geography,interests,the Cold War and the leaders of Egypt.As the basis of Egypt’s foreign relations,the geography of Egypt determines fundamental directions of Egypt’s foreign relations:the Arab world,Israel,great powers,Europe and Africa.Although safeguarding national interests is the fundamental starting point in Egypt’s foreign relations,the national interests of Egypt have different points of emphasis at different times.Additionally,Egypt still bears the mission of protecting the interests of the Arab nation.As the international background of Egypt’s foreign relations before the 1990s,the Cold War had great impact on many aspects of Egypt’s foreign relations;the United States and the Soviet Union were top priority in its foreign relations during that period of time.Under the unique political mechanism,Egyptian leaders have supreme power in foreign policy decision-making and Egypt’s foreign relations are branded with a mark of personal traits of Egyptian leaders.Despite the recent Egyptian political mutation,geography,interest and leaders are still the basic focus of external relations of Egypt,so Egyptian diplomatic pattern is unlikely to have dramatic changes. | CHEN Tianshe | 2011 | Asian Journal of Middle Eastern and Islamic Studies2011，5，1： | 0 |
| 11 | Support or Hostility:the Relationship between Arab Countries and Hamas显示文摘Many Arab countries maintain some kind of relations with Hamas,offering financial,moral,or rhetorical support to it,out of consideration of protection and promotion over Arabic national interests.Their support has become important exogenous aid that Hamas could resort to.Among all the Arab countries,Jordan and Syria draw special attention from the outside world for their especially intimate relations with Hamas.However,many Arab countries do not like Hamas,or even have some hostilities to it.There are three reasons that can explain such a paradox:1)They are afraid that Hamas might stir up Islamic extremism inside their own countries;2)The extremist attitudes of Hamas have become a tremendous barrier obstructing the permanent resolution to the Israel-Arab problem;3)They are worrying about the strengthening of Iran.In the final analysis,no matter whether giving support or having hostility towards Hamas,Arab countries formulate their policies on the basis of an overall evaluation and contemplation over their own national interests. | CHEN Tianshe | 2010 | Asian Journal of Middle Eastern and Islamic Studies2010，4，2： | 0 |
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