{"title":"Integration of GNSS-PPP and IMU/SPEED Sensors in Urban Areas","authors":"N. Kubo, Yize Zhang, Daisuke Hatta","doi":"10.33012/2019.16782","DOIUrl":"https://doi.org/10.33012/2019.16782","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130987414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. M. Berhold, R. Leishman, B. Borghetti, D. Venable
{"title":"Hyper-parameter Comparison on Convolutional Neural Network for Visual Aerial Localization","authors":"J. M. Berhold, R. Leishman, B. Borghetti, D. Venable","doi":"10.33012/2019.16846","DOIUrl":"https://doi.org/10.33012/2019.16846","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121164169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper describes methods for constellation monitoring in the absence of external precise clock estimates. Careful characterization of constellation performance is necessary for the use of Advanced RAIM (ARAIM). In particular, the narrow (Psat) and wide (Pconst) fault rates must be determined. However, typical constellation monitoring approaches rely on the comparison between the broadcast ephemeris and precise estimates of the satellite orbit and clock, and these may not always be available. Furthermore, they may only monitor reference signals that will not actually be operationally used. This paper describes a method to independently estimate satellite clock and differential code biases in order to evaluate the ranging performance of GPS and GLONASS for ARAIM. Daily variations in the L1 C/A-L5Q clock and differential code bias are examined and quantified. Finally, GLONASS faults are closely examined using the clock estimation techniques.
{"title":"SIS Monitoring for ARAIM in the Absence of Precise Clock Estimates","authors":"Kazuma Gunning, T. Walter, David Powell","doi":"10.33012/2019.16838","DOIUrl":"https://doi.org/10.33012/2019.16838","url":null,"abstract":"This paper describes methods for constellation monitoring in the absence of external precise clock estimates. Careful characterization of constellation performance is necessary for the use of Advanced RAIM (ARAIM). In particular, the narrow (Psat) and wide (Pconst) fault rates must be determined. However, typical constellation monitoring approaches rely on the comparison between the broadcast ephemeris and precise estimates of the satellite orbit and clock, and these may not always be available. Furthermore, they may only monitor reference signals that will not actually be operationally used. This paper describes a method to independently estimate satellite clock and differential code biases in order to evaluate the ranging performance of GPS and GLONASS for ARAIM. Daily variations in the L1 C/A-L5Q clock and differential code bias are examined and quantified. Finally, GLONASS faults are closely examined using the clock estimation techniques.","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122200101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Seasonality of the Local-time Variations in Formosat-3/COSMIC S4 Indices and Ionospheric Electron Density","authors":"C. S. Salinas, L. Chang","doi":"10.33012/2019.16803","DOIUrl":"https://doi.org/10.33012/2019.16803","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131007414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Yang, Yu Zheng, Wenkun Yu, D. Weng, Wenbin Li, Wu Chen
{"title":"A Novel Application of Deformation Monitoring using GNSS-R Technology","authors":"Yang Yang, Yu Zheng, Wenkun Yu, D. Weng, Wenbin Li, Wu Chen","doi":"10.33012/2019.16831","DOIUrl":"https://doi.org/10.33012/2019.16831","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132489476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yueqiang Sun, Congliang Liu, W. Bai, Yan Liu, Q. Du, Xianyi Wang, Guanglin Yang, M. Liao, Zhongdong Yang, Xiaoxin Zhang, X. Meng, Danyang Zhao, Junming Xia, Yuerong Cai, G. Kirchengast
{"title":"The FengYun-3 Radio Occultation Sounder GNOS: A Review of the Missions and Early Results","authors":"Yueqiang Sun, Congliang Liu, W. Bai, Yan Liu, Q. Du, Xianyi Wang, Guanglin Yang, M. Liao, Zhongdong Yang, Xiaoxin Zhang, X. Meng, Danyang Zhao, Junming Xia, Yuerong Cai, G. Kirchengast","doi":"10.33012/2019.16833","DOIUrl":"https://doi.org/10.33012/2019.16833","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116996799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Due to the enormous fields of application, Unmanned Air Systems (UAS) nowadays differ inter alia in size, weight, thrust and range. The high diversity of application imposes a broad range of requirements to the flight control software of the Unmanned Air Vehicle in terms of complexity, computational effort and tracking performance. Trajectory flights based on way-points, automatic take-off and landing capabilities, or safe area detection and adherence algorithms require reliable and accurate distance and flight path calculation methodologies. This paper reviews, analyses and evaluates seven different methods to calculate the shortest distance and its corresponding flight path course between coordinates on the WGS84 reference ellipsoid. Depending on the operating distance of the UAS, the accuracy and the computational complexity can be reduced dramatically by utilizing an application-adapted calculation method. This paper recommends the suitable approximation method for the application of your Unmanned Air Vehicle System. Since the computational complexity gets rising significance due to software verification and safety assessment the distance calculation should be kept as simple as feasible by utilizing the appropriate distance calculation method while maintaining accuracy and tracking performance. The feasibility of the proposed methods is discussed for three different typical application scenarios.
{"title":"Distance Determination Between WGS84 Coordinates: An Assessment of Approximation Methods for Reduced Computational Complexity","authors":"David Seiferth, C. Blum, M. Heller, F. Holzapfel","doi":"10.33012/2019.16809","DOIUrl":"https://doi.org/10.33012/2019.16809","url":null,"abstract":"Due to the enormous fields of application, Unmanned Air Systems (UAS) nowadays differ inter alia in size, weight, thrust and range. The high diversity of application imposes a broad range of requirements to the flight control software of the Unmanned Air Vehicle in terms of complexity, computational effort and tracking performance. Trajectory flights based on way-points, automatic take-off and landing capabilities, or safe area detection and adherence algorithms require reliable and accurate distance and flight path calculation methodologies. This paper reviews, analyses and evaluates seven different methods to calculate the shortest distance and its corresponding flight path course between coordinates on the WGS84 reference ellipsoid. Depending on the operating distance of the UAS, the accuracy and the computational complexity can be reduced dramatically by utilizing an application-adapted calculation method. This paper recommends the suitable approximation method for the application of your Unmanned Air Vehicle System. Since the computational complexity gets rising significance due to software verification and safety assessment the distance calculation should be kept as simple as feasible by utilizing the appropriate distance calculation method while maintaining accuracy and tracking performance. The feasibility of the proposed methods is discussed for three different typical application scenarios.","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"119 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123567749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Wolkow, Maik Angermann, Andreas Dekiert, U. Bestmann
{"title":"Model-based Threshold and Centerline Detection for Aircraft Positioning during Landing Approach","authors":"S. Wolkow, Maik Angermann, Andreas Dekiert, U. Bestmann","doi":"10.33012/2019.16787","DOIUrl":"https://doi.org/10.33012/2019.16787","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114277175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Application Research of IGS Products in GPS Real-time Positioning and Timing","authors":"Ran Yan, Jian-Feng Wu, Yonghui Hu","doi":"10.33012/2019.16854","DOIUrl":"https://doi.org/10.33012/2019.16854","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121459289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Instantaneous Decimeter-level Positioning using Triple-frequency GPS/BeiDou/Galileo/QZSS Data Over Wide Areas","authors":"J. Geng, Jiang Guo, Hua Chang, Ran Zeng","doi":"10.33012/2019.16786","DOIUrl":"https://doi.org/10.33012/2019.16786","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131243169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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