On the morning of May 27, the 12th China Satellite Navigation Conference S01 Session Professional GNSS Applications was held in the International Hall A on the third floor of Primus Hotel Nanchang International Expo City, Jiangxi. The Session was hosted by Zhao Wenjun, Member of CSNC Organizing Committee and Wang Dangwei, Wang Dun, Zhang Shuangcheng, Wu Caicong and Li Weiqiang, Chairmen of the Session. The S01 Session is focused on the academic exchanges related to innovative theoretical methods and key technical issues that concern the wide applications of BeiDou/GNSS in the fields of national new infrastructure construction, natural resources, scientific research and social livelihood, with emphasis on “BeiDou+” and innovative applications of “+BeiDou”, mainly including the innovative theories, key technologies and application promotions related to the applications of satellite navigation in intelligent transportation, meteorological services, precision agriculture, earth and space science, public security, emergency rescue and disaster relief, resources and environment, location-based services, big data, cloud computing, Internet of things, blockchain, 5G communication, electric power communication, finance and insurance etc. The invited guests and paper authors shared the current situation and latest research results related to the hot topics of applications of the satellite navigation industry at home and abroad. The Session attracted more than one hundred expert and scholar participants.
Based on the research content and research directions of the papers submitted to this year's Conference, the S01 Session has comprehensively considered and planned 8 major themed activities, which are: applications in transportation, meteorological agriculture, earth and space science, public security, aviation industry, data processing, GNSS remote sensing, reflectometry and innovative applications. These 8 themed activities also cover the current research and applications related to hot topics of the satellite navigation technology. Based on these 8 themed activities, the S01 Session invited authoritative experts from aviation and aerospace related universities and research institutes at home and abroad to give invited presentations to elaborate on the new progress and needs of industry applications of satellite navigation systems from different perspectives. Each themed activity opened with an invited presentation and then led to general oral presentations based on the corresponding themed activity. After a full academic exchange and discussion, new ideas, technologies, methods and innovative application achievements of related industry applications under the themed activity were presented, so that the participants could fully understand and grasp the current prospects for applications of China's satellite navigation industry and the development direction of BDS industrialization.
The transportation application topic: Mr. Lu Hongyang, Assistant General Manager of Spatial Information Division of China Transport Telecommunications & Information Center, gave an invited presentation on the current situation of international BDS-based search and rescue (SAR) service and its application outlook, introducing the current situation of global satellite-aided SAR system and the construction of international BDS-based SAR system from space segment, ground segment, user segment and alarm situations respectively, and giving an outlook for applications of international SAR services in maritime, civil aviation, personal SAR, BDS return link and next-generation star-ground processing system etc. Then, Zhang Tao from Beijing Jiaotong University gave a presentation on “Methods for Identification of Train Positioning Environmental Scenes Based on Historical Data Feature Extraction”. The presentation focused on the identification of train positioning environmental scenes and proposed a railroad scene matching method based on FSO and GNSS historical observation data to identify the scenes along the railway lines, providing a basis for the selection of train positioning methods and the evaluation of positioning performance. Li Jialei from Beijing Jiaotong University gave a presentation on “Research on Train Integrity Monitoring Method Based on Multi-Constellation Mobile Baseline Resolution”. The presentation explained the principle of the proposed train integrity monitoring method, i.e. combing GPS and BDS with equal weights and unifying the time and space systems, using double-difference carrier phase to eliminate the errors in the propagation path and satellite clock errors, calculating the length of the moving baseline between two antennas dynamically in real time by using Kalman filtering algorithm and then comparing the length with the actual train length to achieve train integrity monitoring.
The meteorological agriculture topic: Professor Wu Caicong from China Agricultural University gave an invited presentation on “Construction of Precise Operation Service System for Agricultural Machinery based on BDS” by focusing on the applications of BDS-based agricultural machinery, the basic needs of agricultural production and cost analysis etc to explain the significance of BDS services for agricultural production. He also introduced the research directions of his team from two aspects of “autonomous driving and operation” and “operation monitoring and big data” and finally gave an outlook for the service system for precise operation of agricultural machinery. Mr. Wu Lin, Deputy General Manager of .Beijing UniStrong Science & Technology Co., Ltd, gave an invited presentation on “Application of BDS PPP-B2b Service in Self-driving Agricultural Machinery”, introducing precise point positioning and BDS PPP-B2b positioning service, describing the implementation and performance test of BDS PPP-B2b receivers, and explaining the applications of BDS PPP-B2b services in the automated driving system of agricultural machinery. Xu Xiaojing from East China Normal University gave a presentation on "Establishment of the Weighted Average Temperature Model for Chongming Eco-island and Its Application in Typhoon Lekima”, which is important for understanding and forecasting typhoons by analyzing the changes of PWV during typhoons. Zhang Zhen from Shandong University gave a presentation on “Analysis of Capabilities for Detection of Atmospheric Boundary Layer of COSMIC-2”, which analyzed the ABLH detection capabilities of COSMIC-2 in terms of effective detection quantity and inversion accuracy respectively.
The innovative application topic: Mr. Niu Bingqian, General Manager of Satellite Communication Division, China Petroleum Pipeline Bureau, gave an invited presentation on “Typical Applications of BDS-based Navigation Services in Oil and Gas Industry”, which gave a detailed analysis of the demand and market prospects of BDS applications in oil and gas industry, and introduced typical BDS applications in oil and gas industry. Mr. Chen Haomin, Manager of U-BOX China, gave an invited presentation on “Reliable Positioning based on GNSS and IMU”, sharing the current applications and challenges of GNSS, and introducing the methods of robustness against security threats and accurate estimation based on protection levels. Li Yan from Wuhan University gave a presentation on “Deformation Measurement based on the Phase of the Reflected Signals from BDS GEO Satellites", analyzing the phase change of the reflected signals of the measured target. Mr. Xing Lei from Shenzhen Zhongbing Jiakang Technology Co., Ltd, shared the application of BDS short message technology in fusion communication system, which could solve the problem of contacting the outside world with ordinary cell phones when the personnel are working in no signal or weak signal areas. Dr. Xianyu Wu from Zhonghaida Joint Laboratory of Geographic Information Technology, Jiangxi Normal University gave a presentation on “Infrared Night Vision UAV Intelligent Patrol System based on BDS Flight Control”, sharing the background, key technologies, advantages of the system and prospects for further research.
The earth and applied science topic: Professor Manuel Hernandez Pajares from Polytechnic University of Catalonia, Spain, was invited to give an invited presentation on "GNSS Astronomy: Present Status and Potential Future" and exchanged views and discussed with the participants online. Li Song from Chang'an University gave a presentation on "Tropospheric Delay Modeling based on Multi-source Data Fusion and Machine Learning", using BP neural network, RBF neural network and least squares support vector machine (LSSVM) based on the ERA5 product from North America in 2020 and the tropospheric delay products provided by the international GNSS service to achieve ZTD inversion based on multi-source data fusion. Zhu Ge from Guilin University of Technology shared a new method of constructing a real-time high-precision ZHD vertical profile model for regions in China based on sliding window algorithm. Shi Jiaqi from China University of Mining and Technology presented his research on the spatio-temporal characteristics of COSMIC-2 occultation data at the top height of the global tropical and subtropical troposphere from the perspectives of research background, the algorithm for calculating the top height of the troposphere and spatio-temporal characteristics of this top height and the validation of the experimental results.
The authoritative experts invited to this Session have many years of rich scientific research experience and have accumulated rich academic achievements and achieved fruitful practical results in the field of industry applications of satellite navigation. The presentations given by the guest participants were in-depth and easy to understand, systematic and comprehensive, accompanied by lively exchanges and interactions onsite. The S01 Session is a complete success.