Adaptable Meta-Signal Tracking for Next-Generation Satellite Navigation Systems and LEO PNT by Andrea Nardin, Fabio Dovis, Francesca Zanier, Floor Melman

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Topology structure and routing policy based on multilayered clusters in Beidou satellite navigation system by Fei-long LI, Guang-xia LI, Zhi-qiang LI, Feng-bin PENG

Subjects: “…Beidou satellite navigation system…”
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Enhanced Beidou user equipment access authentication protocol based on location key by Jin CAO, Qiuyu BU, Yuanyuan YANG, Hui LI, Qiao LIU, Maode MA

Subjects: “…Beidou satellite navigation system…”
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Routing Protocol for Intelligent Unmanned Cluster Network Based on Node Energy Consumption and Mobility Optimization by He Dong, Baoguo Yu, Wanqing Wu

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Novel navigation signal design based on spreading code time shift position modulation by Jiafang KANG, Hongxing WANG, Xiguo LIU, Peilin ZHONG, Bifeng LI

“…A novel navigation signal design method based on spread code time shift position modulation was proposed,which inherits the idea of separating the pilot signal component and the data signal component,and applies time shift position of the spread code to carry data information.The old pattern of using carrier phase to carry information was changed,the power efficiency of data signal components and the performances of the satellite navigation system were improved.Theoretical analysis and simulation results show that the proposed method can significantly improve the transmission rate of data signal component or power ratio of the pilot signal component to data signal component without increasing the total transmission power.Then,the transmission rate,acquisition and tracking performance,positioning accuracy and other technical indicators of the satellite navigation system can be further improved.…”
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A Robust Method to Suppress Jamming for GNSS Array Antenna Based on Reconstruction of Sample Covariance Matrix by Yanyun Gong, Ling Wang, Rugui Yao, Zhaolin Zhang

“…Therefore, antijamming performance of the receiver is always the key to studies of satellite navigation system. In antijamming application of satellite navigation system, if active jamming is received from array antenna main-lobe, main-lobe distortion happens when the adaptive filtering algorithm forms main-lobe nulling. …”
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On the scheme of delay-waiting direct rapid acquisition of very long PN code by WANG Hao, YI Da-jiang, WANG Fei-xue, ZHUANG Zhao-wen

“…A scheme of direct rapid acquisition of very long PN code that was used in satellite navigation system based on DSSS was presented.In the scheme,the delay of the local PN code was determined through estimate the clock bias between local satellite clock,and which is used to preset the match filter.The scheme was so called “delay-waiting” method.The deeply analysis on technique details and acquisition performance of the scheme is given.…”
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Discussion on the common sense of the Internet of things by Yu SUN

“…The development of Internet of things (IoT) in China is in the second decade.First of all,the outcome of the IoT was reviewed.The industry formation and system structure of IoT were introduced.Then,the development process,trends and key points of the next generation of IoT were summarized in the aspect of the service platform,sensor industry,access links and fusion with technologies such as cloud computing,edge computing,big data,identity resolution,blockchain,satellite navigation system,5G and so on.Finally,the problems and possible ideas of the development of IoT in China were put forward in the fields of the application positioning,theoretical research,standard-setting and security.Hope to provide reference for colleagues to understand the IoT.…”
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Evaluation method of satellite navigation signal-in-space user range error by Ershen WANG, Qing ZHANG, Hong LEI, Tao PANG

“…Signal-in-space（SIS）accuracy is one of the basic performance of satellite navigation system, and the user range error（URE）of satellite is often used as the important indicator of SIS accuracy. …”
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Analysis of influence of ionosphere and troposphere model on RAIM availability of COMPASS by Wei-dong JIAO, Zhi-hu TANG, Xiao-yun SHEN

“…The ionosphere and troposphere are main error sources of satellite navigation system measurement and main factors of COMPASS availability. …”
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Integrity Monitoring Technology of Mixed Constellation of High, Medium and Low Orbit Navigation Based on Genetic Algorithm Star Selection by Zhengcheng WU, Shaojie NI, Wenxiang LIU, Wei XIAO, Zongnan LI

“…Low-orbit satellites are widely used in communication, navigation, remote sensing and other fields, which is of great significance to meet the needs of communication and improve the accuracy of navigation and positioning.Integrity technology is an important guarantee for the safe and reliable operation of satellite navigation system.With the mature development of low orbit technology and the gradual application of a large number of low orbit satellites, it is urgent to develop the system integrity monitoring technology under the condition of mixed constellation of high and low orbits.This paper proposed a hybrid constellation integrity monitoring technology for high, middle and low orbit navigation based on genetic algorithm for star selection.On the basis of the traditional optimal geometric accuracy factor selection method, genetic algorithm was introduced to construct a fitness factor based on the linear weighted feature slope of the satellite geometric observation matrix, so as to achieve rapid convergence of user protection level to protection limit.This method further improved the integrity of the receiver by optimizing the way of star selection.Under the accuracy requirement of CAT I, for the ＆quot;BeiDou+StarNet-1＆quot; constellation, the global availability level of the proposed algorithm was 5.60%, and the enhancement effect was the best for the mid-latitude and low-latitude of the Eastern Hemisphere, which were increased by 7.01% and 6.42%, respectively.…”
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Analysis of Multifrequency GNSS Signals and an Improved Single-Epoch RTK Method for Medium-Long Baseline by Jian Chen, Jiahui Wang, Kaikun Zhang, Wei Duan, Xingwang Zhao, Chao Liu

“…The BeiDou Navigation Satellite System (BDS) and Galileo satellite navigation system (Galileo) broadcast triple-frequency signals and above to users, thus enhancing the reliability, continuity, and availability of the single-epoch real-time kinematic (RTK) positioning. …”
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GLONASS AS A TOOL TO ENSURE THE SAFETY OF TRANSPORTATION OF DANGEROUS GOODS by A. Ochkalova

“…The article describes the definition of dangerous goods, shows the reasons for the increased control over the transportation of such kind of goods and special security measures, gives the peculiarities of satellite navigation systems, the algorithm of implementation of the global navigation tracking system in practice, and shows a need for further measures to ensure safety transportation of dangerous goods.…”
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Research progress of ARAIM technology by Ershen WANG, Di YANG, Chen HONG, Pingping QU, Xiaoyu LAN, Chuanyun WANG, Tao PANG

“…With the development of multi-constellation satellite navigation systems and dual-frequency technology,it has become possible to apply advanced receiver autonomous integrity monitoring(ARAIM) to higher-level vertical precision approaches.Firstly,three important contents related to ARAIM were introduced:integrity performance requirements,integrity support information,threat types and mitigation methods.Then,ARAIM related technologies research at home and abroad were summarized:fault classification,constellation configuration and ARAIM availability.Finally,combined with the current development of ARAIM,the future research was expected.…”
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Improved F-RRT∗ Algorithm for Flight-Path Optimization in Hazardous Weather by Xue Qiu, Yaohui Li, Rui Jin, Zhi Zhao, Jiajun Li, Donglin Lu, Linhui Ma

“…With the development of satellite navigation systems, the study of flight-path optimization under hazardous weather conditions has become especially important. …”
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