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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Fang, Yanan Wang, Chong Wang, Jingyan Liu, Bin Zhang, Zhibin State Key Laboratory of Astronautic Dynamics Xi’an710043 China Xi’an Satellite Control Center Xi’an710043 China

ISBN: (纸本)9789811966125

The BDS-3 system has completed its constellation deployment and has been formally commissioned. Data quality analysis is an effective way to verify the signal system and evaluate the performance of the receiver, and is also the premise of the high-precision application of onboard GNSS. Utilizing the BDS/GPS dual-frequency observation of the multi-GNSS receiver carried by TH-4 satellite, the data quality and service performance of each system were analyzed and compared through such indicators as carrier-to-noise ratio (CNR), multipath effect, available satellites number, and geometric dilution of precision (GDOP). The results indicate that the carrier-to-noise ratios of IGSO and GEO signals of BDS is slightly lower than those of MEO signals. The CNR of GPS L1 signal is comparable to that of BDS, and the signal strength of GPS L2 is obviously lower than that of others by about 4 dBHz. The multipath error of GPS signal and BDS B1I signal are at an identical level, while BDS B3I is much better, reaching 0.14 m. In terms of the carrier phase data cycle slips ratio, BDS and GPS are roughly equivalent. The average cycle slip time reaches nearly 30 min. The visible satellites number and GDOP value of BDS are better than those of GPS during the experiment period. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Global positioning system

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Analysis of Orbit Determination Accuracy of GEO Satellite Navigation Data 8th

Analysis of Orbit Determination Accuracy of GEO Satellite Na...

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8th International Conference on Signal and Information Processing, Network and Computers, ICSINC 2021

作者： Ye, Xiusong Ma, Hong Yang, Yang Cheng, Yuancang Liu, Xing State Key Laboratory of Astronautic Dynamics Xi’an710043 China Xi’an Satellite Control Center Xi’an710043 China

ISBN: (纸本)9789811933868

Aiming at the problem of rank deficiency of orbit determination algorithm equation caused by weak navigation signal, poor geometric structure of signal and small number of visible satellites of a GEO satellite, a weighted least square orbit determination algorithm with additional constraints are proposed based on the relative geostationary characteristics of GEO satellite, which can improve the success rate of orbit determination of GEO satellite navigation signal when the number of navigation satellites are less than 4 and the measurement value is poor. Shorten the initialization time of the receiver. Based on the characteristics of strong radial constraint, weak lateral constraint, strong lateral constraint and strong longitudinal constraint of the ground-based orbit measurement data, the feasibility of the above algorithm is verified by the space-based heterogeneous data fusion orbit determination test. The results show that the accuracy of the two kinds of orbit determination test results are the same, and the root mean square error of the total position in the overlapping trackarc is superior to 5 m. The root mean square error of the total velocity is superior to 2 mm/s. It is concluded that the effectiveness of GNSS system supporting orbit determination of high orbit spacecraft is verified, which provides technical support for the application of GNSS orbit determination mission in the future. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Data fusion

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Trajectory Determination and Performance Analysis of Space-Based Tracking Measurement for Rocket Onboard GNSS Receiver

Trajectory Determination and Performance Analysis of Space-B...

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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Zhao, Shuqiang Zhang, Wei Zhang, Jianhai State Key Laboratory of Astronautic Dynamics Xi’an710043 China Xi’an Satellite Control Center Xi’an710043 China

ISBN: (纸本)9789811966125

In recent years, in space launch vehicle tracking measurement, Space-based TT&C tests of Rocket Onboard GNSS have been carried out continuously, this paper discusses the measurement method, data transmission mode and decoding mode of the use of TDRS System to track the Onboard of GNSS, using TDRS back telemetry data of the Onboard GNSS determine high precision trajectory measurement, the comparison and analysis of the quality of Space-based TT&C test data, Land-based data and Tracking Ship data show that the tracking arc of Space-based TT&C data is longer and has more robust data quality, which provides strong support for high-precision trajectory determination of Rocket. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Trajectories

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Anti-interference of Direct Sequence Spread Spectrum System Based on Wavelet and Eigenvalue Decomposition 8th

Anti-interference of Direct Sequence Spread Spectrum System ...

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8th China High Resolution Earth Observation Conference, CHREOC 2022

作者： Tengfei, Zhao Zhao, Shen Jie, Shang Junyao, Li Peijie, Liu State Key Laboratory of Astronautic Dynamics Xi’an710043 China Xi’an Satellite Control Center Xi’an710043 China

ISBN: (纸本)9789811982019

Limited by the processing gain of the spread spectrum system, the high power interference in the satellite space-to-earth communication cannot be suppressed effectively. It will bring high Bit Error Rate(BER) to the telemetry、track and command(TT&C) link. Based on the analysis of the Direct Sequence Spread Spectrum (DSSS) system in anti-interference, a method of anti-interference in DSSS is proposed in this paper. Combining the advantages of Wavelet Transform(WT) in singularity detection and Eigenvalue Decomposition(ED) in blind source separation, the method based on WD and ED is proposed. The simulation results indicate that the method can suppress the interference effectively and will improve the anti-interference ability of DSSS. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Bit error rate

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Study on Planning Strategy of TT&C Resource Scheduling Based on Data Mining 8th

Study on Planning Strategy of TT&C Resource Scheduling Based...

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8th International Conference on Signal and Information Processing, Network and Computers, ICSINC 2021

作者： Shen, Ying Gao, Huili Yang, Zhaoqiang Zheng, Jianjun Zhao, Wei Xi’an Satellite Control Center Xi’an710043 China State Key Laboratory of Astronautic Dynamics Xi’an710043 China

ISBN: (纸本)9789811933868

Currently, the scheduling mode used by most TT&C resource scheduling system was based on the mission requirements offered by users. After the scheduling plan is formulated, the resource redundancy has been basically determined, without the advance planning of the resources. This article analyzed the data of the scheduling system, by dividing the requirements of resources into two types of "period" and "peak". Through analyzing the periodic use of resource historical data, the periodic resource demand will be predicted and guided resources for time-dividing and domain-planning. By analyzing the allocation data of dynamic resource scheduling, the peak resource will be reserved to enable and recycle dynamically in actual. Finally the strategy was verified by simulation, which provided a different approach to improve the utilization rate of the entire network resources. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Scheduling

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Ill-conditioned Matrix Problem and Its Solution in Multi-constellation Navigation and Positioning of Launch Vehicle

Ill-conditioned Matrix Problem and Its Solution in Multi-con...

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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Zhang, Wei Zhang, Dong Zhang, Jianhai Liu, Junqiang State Key Laboratory of Astronautic Dynamics Xi’an710043 China Xi’an Satellite Control Center Xi’an710043 China

ISBN: (纸本)9789811966125

With the increasing number of on orbit navigation satellites, the application of multi-constellation joint navigation and positioning has become the norm. In order to improve the accuracy and stability of satellite navigation and positioning, a set of ill-conditioned observation matrix screening scheme is designed for GNSS multi-constellation navigation and positioning system. By calculating the condition number of the observation matrix, the factors that cause the ill conditioned observation matrix are automatically traversed to form a healthy observation satellite combination for target location calculation. In this paper, the multi-constellation navigation and positioning observation data are used to verify the algorithm. The results show that this scheme can quickly and accurately screen out the observation vectors that cause the observation matrix ill-condition, and the accuracy and stability of multi-constellation navigation and positioning are obviously improved, and has certain practical value in fast positioning. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Orbits

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Precision Orbit Determination for LEO Based on BDS Navigation Data 10th

Precision Orbit Determination for LEO Based on BDS Navigatio...

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10th International Conference on Signal and Information Processing, Network and Computers, ICSINC 2022

作者： Li, Chao Ye, Xiusong Ma, Hong Sun, Shouming Yang, Yang State Key Laboratory of Astronautic Dynamics Xi’an710043 China Xi’an Satellite Control Center Xi’an710043 China

ISBN: (纸本)9789811999673

Since the Beidou navigation system was officially opened to the world. The number of satellite that equipped with multimode navigation receivers to receive BDS, GPS and other navigation system signals has been increased greatly. This paper analyzes the precision orbit determination based on the Beidou navigation data of spacecraft in orbit. The satellite orbit perturbation model is selected properly, and the spaceborne BDS orbit determination algorithm with dynamic compensation is established effectively. The accuracy of BDS navigation data and dynamic compensation orbit determination results are verified by using GPS navigation data and GPS Precise Orbit Determination results. The results indicate that the accuracy of BDS navigation data is equivalent to GPS navigation data, the rms (root mean square) deviation of position is less than 10 m, and the rms deviation of velocity is less than 0.05 m/s. The orbit determination accuracy of BDS data and that of GPS data are nearly equal. The position difference of orbit determination results is better than 10 m, and the velocity error is less than 0.006 m/s. It can be seen that the method improved the orbit determination accuracy of BDS navigation data and provide a basis for increasing the application of BDS navigation data in subsequent spacecraft orbit determination tasks. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Global positioning system

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Research Advancements in Artificial Intelligence for Space Situational Awareness 13

Research Advancements in Artificial Intelligence for Space S...

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13th International Conference on Information Science and Technology, ICIST 2023

作者： Hou, Pengrong Wang, Zhelong Jiang, Yu Zhu, Jun Chu, Qinghao Li, Jiaxi School of Control Science and Engineering Dalian University of Technology Dalian China State Key Laboratory of Astronautic Dynamics Xi'an Satellite Control Center Xi'an China

ISBN: (纸本)9798350313925

The increasing of satellite launch missions, collisions and disintegration events of space objects, and the vast number of near-Earth asteroids pose significant challenges to space traffic management. Space situational awareness aims to detect, track, classify, and characterize space objects, as well as assess space events, playing a crucial role in space traffic management. The application of artificial intelligence in space situational awareness has unique advantages, especially in enhancing comprehensive abilities such as knowledge, analysis, and decision-making. Its outstanding abilities in transfer learning and lifelong learning can rapidly address complex and dynamic space detection problems. This paper reviews and analyzes the research progress of AI in space situational awareness in the past five years, focusing on data collection, situational awareness, and decision-making. While discussing the advantages and limitations of technical applications, it addresses the feasibility of applying emerging technologies such as distributed machine learning, knowledge graphs, and multi-agent game theory to future space situational awareness research, considering the characteristics of space data and new requirements. This paper points out the effectiveness and necessity of artificial intelligence in space situational awareness, which can provide reference for strengthening space environmental understanding and promoting relevant research in space traffic management. © 2023 IEEE.

关键词： Decision making

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Potential sliding zone recognition method for the slow-moving landslide based on the Hurst exponent

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第10期16卷 4105-4124页

作者： Haiqing Yang Lili Qu Lichuan Chen Kanglei Song Yong Yang Zhenxing Liang State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Civil EngineeringChongqing UniversityChongqing400045China Technology Innovation Center of Geohazards Automatic Monitoring Ministry of Natural Resources(Chongqing Institute of Geology and Mineral Resources)Chongqing401120China

The abrupt occurrence of the Zhongbao landslide is totally unexpected,resulting in the destruction of local infrastructure and river *** review the deformation history of the Zhongbao landslide and prevent the threat of secondary disasters,the small baseline subsets(SBAS)technology is applied to process 59 synthetic aperture radar(SAR)images captured from Sentinel-1A ***,the time series deformation of the Zhongbao landslide along the radar line of sight(LOS)direction is calculated by SBAS ***,the projection transformation is conducted to determine the slope ***,the Hurst exponent of the surface deformation along the two directions is calculated to quantify the hidden deformation development trend and identify the unstable deformation *** the suddenness of the Zhongbao landslide failure,the multi-temporal interferometric synthetic aperture radar(InSAR)technology is the ideal tool to obtain the surface deformation history without any monitoring *** obtained deformation process indicates that the Zhongbao landslide is generally stable with slow creep deformation before ***,the Hurst exponent distribution on the landslide surface in different time stages reveals more deformation evolution information of the Zhongbao landslide,with partially unstable areas detected before the *** potential unstable areas after the Zhongbao landslide disaster are revealed by the Hurst exponent distribution and verified by the GNSS monitoring results and deformation mechanism *** method combining SBASInSAR and Hurst exponent proposed in this study could help prevent and control secondary landslide disasters.

关键词： Zhongbao landslide Interferometric synthetic aperture radar (InSAR)technology Hurst exponent Deformation process Unstable area identification

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Chemical Reactor Estimation Based on Sensors Network with Dropouts 16

Chemical Reactor Estimation Based on Sensors Network with Dr...

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16th International Conference on Stability and Oscillations of Nonlinear control Systems (Pyatnitskiy's Conference), STAB 2022

作者： Yurchenkov, Alexander V.A. Trapeznikov Institute of Control Sciences of RAS Laboratory of Dynamics of Control Systems Moscow Russia

ISBN: (纸本)9781665465861

In this paper, the estimation problem for the chemical reactor is considered. The model of measurement contains random variables with Bernoulli distribution, which are associated with dropouts. The anisotropy level for extended vector of input sequence is bounded by given positive value a. The input-to-estimation error system is described in terms of time-varying system with multiplicative noises. The boundedness of anisotropic norm for input-to-estimation error system is reduced to convex optimisation problem. © 2022 IEEE.

关键词： Anisotropy

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