Proceedings of the ION 2019 Pacific PNT Meeting最新文献

{"title":"Future of Space-based PNT","authors":"David C. Chapman","doi":"10.33012/2019.16792","DOIUrl":"https://doi.org/10.33012/2019.16792","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"49 6 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":"122746116","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":"Assessment and Mitigation of Ionospheric Spatial Decorrelation on GBAS: Lessons Learned","authors":"Jiyun Lee","doi":"10.33012/2019.16840","DOIUrl":"https://doi.org/10.33012/2019.16840","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"263 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":"134162511","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":"Revaluation of Spatial Decorrelation Parameters of Atmospheric Delay for GBAS (Ground-based Augmentation System) Safety Design","authors":"T. Yoshihara, S. Saito, A. Kezuka, S. Saitoh","doi":"10.33012/2019.16851","DOIUrl":"https://doi.org/10.33012/2019.16851","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"14 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":"123995336","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":"Barometer Assisted GPS Denied Trilateration Algorithm for Traversing Vertical Three-Dimensional Spaces","authors":"Alvin Goh Cheng Ann, Alvee Ahmed, G. Soh, S. Foong","doi":"10.33012/2019.16802","DOIUrl":"https://doi.org/10.33012/2019.16802","url":null,"abstract":"GPS denied localization has increasing application for indoor tracking and navigation. However, general literature focus on finding a location solution within the horizontal x-y plane. We propose a GPS-denied localization algorithm that targets better accuracy for a user travelling significant vertical distances compared to level ground. This algorithm works on the basis of taking a height reading from a barometer and reducing the trilateration problem into a two-dimensional problem. With this algorithm, we are able to obtain a three-dimensional solution with less time and comparable accuracy to conventional three-dimensional trilateration. Our simulations and initial hardware testing show that utilizing the barometer’s readings could cut the computation time compared to conventional three-dimensional algorithms as measurement noise increases relative to the range measurements. We intend to apply the results of this study to an algorithm that can optimize node placement in three-dimensional space, all while the user travels through an area and plants new anchors for the localization network.","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"67 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":"120980827","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":"Transfer Alignment Using Synergistic IMUs","authors":"S. Moafipoor, Brad Despres, J. Fayman, L. Bock","doi":"10.33012/2019.16775","DOIUrl":"https://doi.org/10.33012/2019.16775","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"49 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":"128329668","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":"Lower Bounds in Optimal Integrity Monitoring","authors":"J. Blanch, T. Walter","doi":"10.33012/2019.16788","DOIUrl":"https://doi.org/10.33012/2019.16788","url":null,"abstract":"The goal of integrity monitoring in positioning algorithms consists in finding a test statistic and an estimator that meets both the integrity requirements and the alert requirements under a set of conditions. The search for such test statistics can be cast as an optimization problem where the goal is to minimize the integrity risk while maintaining the alert requirements. In this work, we provide results that extend previous results in two ways. First, we provide a lower bound on the integrity risk for linear unbiased estimators (but not necessarily optimal). Second we provide a lower on the integrity risk in the case of fault detection and exclusion. The results developed in this work here are general. In particular, they are applicable to both snapshot solutions and Kalman filter solutions, and to any combination of sensors. INTRODUCTION Until recently, integrity monitoring in radio-navigation was mostly limited to aircraft navigation. It is now being expanded to automotive, rail, and maritime applications [1], [2], [3]. Given the increased awareness of GNSS threats (like spoofing), it is likely that integrity monitoring will pervade most navigation systems. There are many different types of integrity monitoring algorithms, each responding to a different design constraint. In all cases, it can be useful to know what the minimum achievable integrity risk is, for at least three reasons. First, these bounds tell us whether it makes sense to continue improving the algorithm; second, the search itself shows us which class of algorithms will likely perform well, third, if the lower limit is too high, then we know that we should be looking somewhere else to achieve the desired performances (like more measurements, additional structure, or more constraints on the fault modes). Finding the optimal integrity monitoring algorithm is in general a very difficult problem. It is however possible to define tractable problems that can be proven to provide a lower bound on the achievable integrity risk in the original problems. Optimality results in the range domain pre-date the development of integrity in GNSS ([4], [5]). These results have been adapted to GNSS in at least [6]. In [7], we proved that in the case of one threat, even multi-dimensional, the optimal detection statistic is the solution separation statistic. This was achieved by casting the search of the optimal detection region as a minimax problem, and using the Neyman-Pearson lemma to limit the search of the detection regions to a class of regions parameterized by a bias. These results allowed us to establish a lower bound on the minimum integrity risk. However, these results were only proven for least squares estimators and for the detection problem only. In this work, we expand and generalize the theoretical results from [7] in two directions. First, we provide lower bounds on the lowest possible achievable integrity risk given a set of measurements and a threat space in the case of linear esti","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"54 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":"128958941","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":"Capturing Method of Millimeter Displacement in Centimeter Class PPP-RTK Measured Data","authors":"Koki Asari, M. Saito, I. Mikami","doi":"10.33012/2019.16812","DOIUrl":"https://doi.org/10.33012/2019.16812","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":"129310056","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":"Analysis of Ionospheric Scintillation and its Impact on PPP at Low Latitudes","authors":"K. Guo, M. Aquino, S. V. Veettil, Zhizhao Liu, Wu Chen, H. Marques","doi":"10.33012/2019.16842","DOIUrl":"https://doi.org/10.33012/2019.16842","url":null,"abstract":"on developing novel GNSS receiver tracking models and scintillation mitigation tools, aiming to improve the receiver tracking performance under ionospheric scintillation. deployment of ionospheric scintillation and TEC monitoring receivers research focused on ionospheric effects on GNSS, including system vulnerability to ionospheric disturbances and relevant countermeasures. Nottingham Nottingham in European Commission, European Space Agency and UK research council funded projects. Her research focuses on assessing the effects of space weather on GNSS receivers and positioning errors aiming to improve the modeling of scintillation and to develop scintillation mitigation tools. are GNSS positioning system integrity, various GNSS applications, seamless positioning, and ABSTRACT Ionospheric scintillation refers to the random and rapid fluctuations in the amplitude and phase of radio signals that occur due to their propagation through plasma density irregularities in the ionosphere. For Global Navigation Satellite System (GNSS), scintillation can seriously degrade satellite signal quality and consequently the positioning accuracy, particularly at high and low latitude regions, where ionospheric disturbances are more frequent. This study analyzes the effects of scintillation on Global Positioning System (GPS) Precise Point Positioning (PPP), by making use of scintillation data recorded in Hong Kong during the solar maximum of 2014. Significant positioning error values of as much as 1.34 m in the up direction are observed with kinematic PPP processing under strong scintillation. The variations in the standard deviations of the carrier phase residuals in relation to satellite elevations and scintillation levels are investigated for the first time in this region. It is found that the standard deviation of carrier phase residuals increases depending on scintillation intensity. This study is important to help better understand the scintillation characteristics and its effects on GPS-based positioning in the Hong Kong region. It can also help in modelling the relationship between scintillation and carrier phase residuals, which can be of use in the development of scintillation mitigation approaches for PPP processing. scintillation on This also contribute to the modelling of ionospheric scintillation effects on phase residuals and to the development of scintillation mitigation tools for satellite-based positioning algorithms.","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"107 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":"115526551","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":"Ionospheric Weather Observations with FORMOSAT-3/COSMIC and Prospects with FORMOSAT-7/COSMIC-2","authors":"T. Liu, L. Chang, F. Chang, C. Chao","doi":"10.33012/2019.16859","DOIUrl":"https://doi.org/10.33012/2019.16859","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"156 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":"121616695","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":"Kalman Filter Derivation and Comparison to MUltiple SIgnal Classification (MUSIC)","authors":"Russell Powell, Caleb Perry, A. Simmons, Gregory Reynolds, Clinton Blankenship","doi":"10.33012/2019.16807","DOIUrl":"https://doi.org/10.33012/2019.16807","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"100 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":"124596965","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}