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A two-step method to detect broadcast ephemeris unavailable periods caused by BeiDou satellite orbital maneuvers
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作者 Jingjing Wang Chao Zhou Zhixuan Sun 《Geodesy and Geodynamics》 EI CSCD 2023年第5期456-466,共11页
The space constellation of the BeiDou navigation satellite system(BDS) is a hybrid constellation containing medium earth orbit(MEO) satellites, geostationary earth orbit(GEO) satellites, and inclined geosynchronous or... The space constellation of the BeiDou navigation satellite system(BDS) is a hybrid constellation containing medium earth orbit(MEO) satellites, geostationary earth orbit(GEO) satellites, and inclined geosynchronous orbit(IGSO) satellites. Due to the geosynchronous characteristics of GEO and IGSO, GEO satellites and IGSO satellites often need to perform orbital maneuvers, which can affect the signal-inspace(SIS) availability performance of BeiDou satellites. A two-step detection method for BeiDou satellite orbital maneuvers has been proposed in this paper. The first step is to identify orbital maneuvers based on time series analysis of broadcast ephemeris, and the second step is to verify orbital maneuvers based on bidirectional orbit prediction. The two-step detection method was used to detect the orbital maneuvers of BeiDou satellites in 2019. Through the double guarantees of identification and verification,the detection accuracy of BeiDou satellite orbital maneuvers has been effectively improved. And the orbital maneuver detection results are continued to be used to assess the SIS availability of BeiDou satellites. The results show that the availability loss of GEO satellite orbital maneuvers is about 0.45%-1.07%, and the availability loss of IGSO satellite orbital maneuvers is about 0.12%-0.19%. 展开更多
关键词 BDS orbital maneuver Signal-in-space AVAILABILITY Time series analysis
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Investigation of Novel Hydrogen/Oxygen Thruster for Orbital Maneuver in Space Station 被引量:1
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作者 宋雅娜 俞南嘉 +3 位作者 张国舟 马彬 周文禄 黄翔 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2005年第4期289-294,共6页
Hydrogen and oxygen orbital maneuver thruster, based on gas-dynamic resonance ignition, is a new liquid rocket propulsion technology, and is especially applicable to space station. By means of theoretic thermodynamic ... Hydrogen and oxygen orbital maneuver thruster, based on gas-dynamic resonance ignition, is a new liquid rocket propulsion technology, and is especially applicable to space station. By means of theoretic thermodynamic calculation of the hydrogen and oxygen thruster, combined with the experimental exploration on the coaxial hydrogen and oxygen resonance ignition, a scheme of the thruster head configuration is designed as the combination of a coaxial hydrogen/oxygen resonance igniter and an oxygen augmentation injector. Through ignition tests on coaxial hydrogen/oxygen resonance igniter characterization, the thruster head ignition tests have been conducted successfully in sequence of resonance ignition and oxygen augmentation combustion. Finally, the thruster ground tests are successfully carried out in forms of single impulse, successive double impulses and 3.0 seconds continuous running, which verify the reliability and feasibility of the thruster. The response time of the thruster starting is restricted within 0.2 second. 展开更多
关键词 liquid rocket engine THRUSTER IGNITION RESONANCE orbital maneuver
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Recover the abnormal positioning,velocity and timing services caused by BDS satellite orbital maneuvers 被引量:5
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作者 Rui Tu Rui Zhang +3 位作者 Pengfei Zhang Junqiang Han Lihong Fan Xiaochun Lu 《Satellite Navigation》 2021年第1期227-237,共11页
The BeiDou Navigation Satellite System(BDS)provides global Positioning,Velocity,And Timing(PVT)services that are widely used in various areas.The BDS satellites frequently need the orbit maneuvers due to various pertu... The BeiDou Navigation Satellite System(BDS)provides global Positioning,Velocity,And Timing(PVT)services that are widely used in various areas.The BDS satellites frequently need the orbit maneuvers due to various perturbations to keep satellites in their designed positions.During these maneuvers,PVT services may be abnormal if the data from a maneuvering satellite is used.In this paper we developed an approach to recover the abnormal PVT services.By using BDS observations from multiple tracking stations,the orbital errors of a maneuvering satellite can be in real time obtained and corrected,thereby avoiding any influence on the performance of PVT services.The tests show that the average precision of position,velocity and timing services are improved by 0.8 m,0.1 mm/s and 0.16 ns,respectively,using the developed orbital maneuver recovery approach.In addition,the approach can also be used for the orbital maneuver detection and monitoring. 展开更多
关键词 BeiDou Navigation Satellite System Satellite orbital maneuvers Velocity estimation Carrier phase observation
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Optimal maneuvering strategy of spacecraft evasion based on angles-only measurement and observability analysis 被引量:3
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作者 ZHANG Yijie WANG Jiongqi +2 位作者 HOU Bowen WANG Dayi CHEN Yuyun 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2023年第1期172-184,共13页
Spacecraft orbit evasion is an effective method to ensure space safety. In the spacecraft’s orbital plane, the space non-cooperate target with autonomous approaching to the spacecraft may have a dangerous rendezvous.... Spacecraft orbit evasion is an effective method to ensure space safety. In the spacecraft’s orbital plane, the space non-cooperate target with autonomous approaching to the spacecraft may have a dangerous rendezvous. To deal with this problem, an optimal maneuvering strategy based on the relative navigation observability degree is proposed with angles-only measurements. A maneuver evasion relative navigation model in the spacecraft’s orbital plane is constructed and the observability measurement criteria with process noise and measurement noise are defined based on the posterior Cramer-Rao lower bound. Further, the optimal maneuver evasion strategy in spacecraft’s orbital plane based on the observability is proposed. The strategy provides a new idea for spacecraft to evade safety threats autonomously. Compared with the spacecraft evasion problem based on the absolute navigation, more accurate evasion results can be obtained. The simulation indicates that this optimal strategy can weaken the system’s observability and reduce the state estimation accuracy of the non-cooperative target, making it impossible for the non-cooperative target to accurately approach the spacecraft. 展开更多
关键词 rendezvous evasion orbit maneuver angles-only measurement observability degree posterior Cramer-Rao lower bound
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Effectiveness-based orbital optimization for servicing spacecraft
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作者 蔡远文 申功勋 +1 位作者 于小红 李岩 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第2期113-118,共6页
Effectiveness-based system development is an essential technology developing concept advanced by some countries,such as the U.S.A.Making use of Analytic Hierarchy Process,this paper brings forward a methodology for or... Effectiveness-based system development is an essential technology developing concept advanced by some countries,such as the U.S.A.Making use of Analytic Hierarchy Process,this paper brings forward a methodology for orbital optimization based on effectiveness in the case of the orbital deployment for the Servicing Spacecraft(SSC),which needs to accomplish many types of tasks and whose orbit is affected by kinds of factors with contradictions in orbital parameter selection.Firstly,the possible tasks of SSC are decomposed and their degrees of importance are given by the times,probabilities,values of their applications.Then,the supporting capabilities are discussed from the viewpoint of orbit design,and the determination of their weights is put forward.Finally,the relationships between the orbital parameters and the effectiveness are established by using effective function,and three synthesizing methods for a single task and its capabilities are presented. 展开更多
关键词 servicing spacecraft orbital deployment orbital maneuver effective function Analytic Hierarchy Process
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Research on the strategy of angles-only relative navigation for autonomous rendezvous 被引量:13
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作者 LI JiuRen LI HaiYang +1 位作者 TANG GuoJin LUO YaZhong 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第7期1865-1872,共8页
This paper considers the problem of angles-only relative navigation for autonomous rendezvous. Methods for determining degree of observability (DO0) and latent range information of orbital maneuver are proposed for ... This paper considers the problem of angles-only relative navigation for autonomous rendezvous. Methods for determining degree of observability (DO0) and latent range information of orbital maneuver are proposed for analyzing and enhancing the precision of relative position and velocity estimation. The equations of angles-only relative navigation are set forth on the con- dition that optical camera is the only viable sensor for relative measurement, and expressions for the DO0 of relative navigation are obtained by using the Newton iterative method. The latent range information of orbital maneuver is analyzed, which is employed to enhance the DOO of angles-only relative navigation. Simulation result shows that DOO is effective to describe the observability level of relative position and velocity, and the latent range information is useful in enhancing the DOO of the angles-only relative navigation. 展开更多
关键词 autonomous rendezvous relative navigation angles-only degree of observability orbital maneuver
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