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Automatic detection of ionospheric scintillation‐like GNSS satellite oscillator anomaly using a machine‐learning algorithm 使用机器学习算法自动检测电离层类闪烁GNSS卫星振荡器异常
Annual of Navigation Pub Date : 2020-08-24 DOI: 10.1002/navi.385
Y. Liu, Y. Morton
{"title":"Automatic detection of ionospheric scintillation‐like GNSS satellite oscillator anomaly using a machine‐learning algorithm","authors":"Y. Liu, Y. Morton","doi":"10.1002/navi.385","DOIUrl":"https://doi.org/10.1002/navi.385","url":null,"abstract":"In this paper, we propose a machine-learning-based approach to automatically detect a satellite oscillator anomaly. A major challenge is to differentiate an oscillator anomaly from ionospheric scintillation. Although both scintillation and oscillator anomalies cause phase disturbances, their underlying physics are different and, therefore, show different carrier-frequency dependency. By using triple-frequency signals, distinct features are extracted from the disturbed signals and applied to the radial basis function (RBF) support vector machine (SVM) classifier to identify an oscillator anomaly. The results show that the proposed RBF SVM displays superior performance and outperforms several other classification methods. The proposed approach is applied to an extensive GNSS database to conduct automatic satellite oscillator anomaly detection. Preliminary detection results validate the effectiveness of the proposed method. On average, one-to-three satellite oscillator anomaly events are detected daily at each receiver location.","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"651-662"},"PeriodicalIF":0.0,"publicationDate":"2020-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.385","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42257943","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}
引用次数: 6
Mesh topology based clock synchronization technique for pseudolite systems 基于网格拓扑的伪卫星系统时钟同步技术
Annual of Navigation Pub Date : 2020-08-20 DOI: 10.1002/navi.383
Tengfei Wang, Zheng Yao, Mingquan Lu
{"title":"Mesh topology based clock synchronization technique for pseudolite systems","authors":"Tengfei Wang, Zheng Yao, Mingquan Lu","doi":"10.1002/navi.383","DOIUrl":"https://doi.org/10.1002/navi.383","url":null,"abstract":"Clock synchronization is critical for synchronous pseudolite systems. Wireless synchronization methods are desirable for their flexibility in system deployment, and most of them build a tree topology of time information flow based on master-slave synchronization between pseudolites. A slave pseudolite can receive signals broadcast by multiple pseudolites; however, existing methods usually utilize one signal and ignore others in which the time information could improve synchronization precision and reliability. We present a mesh topology based clock synchronization (MTCS) technique by utilizing all received signals. MTCS builds a mesh topology of time information flow, which can keep synchronization in case of link interruption or pseudolite failure. The coupling relationship of slave clocks is derived, and the influence of measurement biases is analyzed. As shown by both analysis and simulations, MTCS has better clock synchronization precision. When link interruption or pseudolite failures occur, MTCS is more robust than tree topology based methods.","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"619-632"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.383","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48056265","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}
引用次数: 5
Improved urban navigation with shadow matching and specular matching 改进了阴影匹配和高光匹配的城市导航
Annual of Navigation Pub Date : 2020-07-14 DOI: 10.1002/navi.378
K. Strandjord, P. Axelrad, S. Mohiuddin
{"title":"Improved urban navigation with shadow matching and specular matching","authors":"K. Strandjord, P. Axelrad, S. Mohiuddin","doi":"10.1002/navi.378","DOIUrl":"https://doi.org/10.1002/navi.378","url":null,"abstract":"As the dependence of Global Navigation Systems (GNSS) increases, so does a growing demand for GNSS accuracy in urban environments. This research aims to improve navigation in these environments by integrating non-line-of-sight signals, building models, and measured signal to noise ratios in ways not typically used in GNSS positioning. We propose a technique of combining elements of shadow matching, non-line-of-sight signal prediction through ray tracing, and collaborative navigation. A specularity metric is developed, which predicts the likelihood of building reflections resulting in non-line-of-sight signal reception, and is used in conjunction with shadow matching techniques to improve positioning. A framework for implementing these approaches is presented and demonstrated using improved positioning techniques built and tested using real-world data collected in urban surroundings.","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"547-566"},"PeriodicalIF":0.0,"publicationDate":"2020-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.378","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46710444","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}
引用次数: 3
Assessment of errors in NavIC observables for stationary receivers 固定接收机导航观测误差评估
Annual of Navigation Pub Date : 2020-06-01 DOI: 10.1002/navi.355
Althaf Azeez, H. Hablani
{"title":"Assessment of errors in NavIC observables for stationary receivers","authors":"Althaf Azeez, H. Hablani","doi":"10.1002/navi.355","DOIUrl":"https://doi.org/10.1002/navi.355","url":null,"abstract":"Our objective in this paper is to assess all errors in NavIC's pseudorange so that they can be mitigated or accounted for appropriately in the dynamics model to achieve high-accuracy navigation. Multipath errors in the L5 and S1 pseudoranges are different; hence, oscillatory multipath is removed using sidereal repeatability for these frequencies separately for accurate iono delay estimation. Iono delay estimates using uncompensated pseudoranges are 7-m greater than the normal night time estimates due to multipath. When oscillations are removed, the difference reduces to =3 m. Dual-frequency iono delay estimates using code phase are within two-sigma of the grid-based estimates. A comparison with the NTCM-GL and Klobuchar iono delay estimates is presented for the low-latitude region in India. The ephemeris line-of-sight errors blended with the unknown multipath bias errors are estimated using a low-pass filter and are found to lie at the edges of the two-sigma signal-in-space error.","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"347-364"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.355","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44928978","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}
引用次数: 2
A simple model for GPS C/A‐code self‐interference GPS C/A码自干扰的一个简单模型
Annual of Navigation Pub Date : 2020-06-01 DOI: 10.1002/navi.359
C. Hegarty
{"title":"A simple model for GPS C/A‐code self‐interference","authors":"C. Hegarty","doi":"10.1002/navi.359","DOIUrl":"https://doi.org/10.1002/navi.359","url":null,"abstract":"","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"319-331"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.359","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44224980","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}
引用次数: 3
Multi‐constellation ARAIM exploiting satellite motion 利用卫星运动的多星座ARAIM
Annual of Navigation Pub Date : 2020-06-01 DOI: 10.1002/navi.334
M. Joerger, B. Pervan
{"title":"Multi‐constellation ARAIM exploiting satellite motion","authors":"M. Joerger, B. Pervan","doi":"10.1002/navi.334","DOIUrl":"https://doi.org/10.1002/navi.334","url":null,"abstract":"In this work, a new time-sequential positioning and fault detection method is developed for dual-frequency, multi-constellation Advanced Receiver Autonomous Integrity Monitoring (ARAIM). Unlike conventional “snapshot” ARAIM, sequential ARAIM exploits changes in satellite geometry at the cost of slightly higher computation and memory loads. From the perspective of users on Earth, the motion of any given GNSS satellite is small over short time intervals. But the accumulated geometry variations of redundant satellites from multiple GNSS can be substantial. This paper quantifies performance benefits brought by satellite motion to ARAIM. It specifically addresses the following challenges: (a) defining raw GNSS code and carrier error models over time, (b) designing estimators and fault detectors exploiting geometric diversity for positioning, cycle ambiguity estimation, and integrity evaluation, and (c) formulating these algorithms in a computationally efficient implementation. Performance improvements provided by sequential ARAIM over snapshot ARAIM are evaluated by worldwide availability analysis for aircraft approach navigation.","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"235-253"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.334","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48087466","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}
引用次数: 9
Autonomous clock ensemble algorithm for GNSS applications 用于GNSS应用的自主时钟集成算法
Annual of Navigation Pub Date : 2020-06-01 DOI: 10.1002/navi.366
M. Coleman, Ron Beard
{"title":"Autonomous clock ensemble algorithm for GNSS applications","authors":"M. Coleman, Ron Beard","doi":"10.1002/navi.366","DOIUrl":"https://doi.org/10.1002/navi.366","url":null,"abstract":"","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"333-346"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.366","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49013156","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}
引用次数: 4
High‐parity vertical Reed‐Solomon codes for long GNSS high‐accuracy messages 用于长GNSS高精度消息的高奇偶性垂直Reed-Solomon码
Annual of Navigation Pub Date : 2020-06-01 DOI: 10.1002/navi.357
I. Fernández‐Hernández, Tommaso Senni, D. Borio, G. Vecchione
{"title":"High‐parity vertical Reed‐Solomon codes for long GNSS high‐accuracy messages","authors":"I. Fernández‐Hernández, Tommaso Senni, D. Borio, G. Vecchione","doi":"10.1002/navi.357","DOIUrl":"https://doi.org/10.1002/navi.357","url":null,"abstract":"","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"365-378"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.357","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48386124","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}
引用次数: 15
Flight results of GPS‐based attitude determination for the Canadian CASSIOPE satellite 加拿大CASSIOPE卫星基于GPS的姿态确定飞行结果
Annual of Navigation Pub Date : 2020-03-01 DOI: 10.1002/navi.348
A. Hauschild, O. Montenbruck, R. Langley
{"title":"Flight results of GPS‐based attitude determination for the Canadian CASSIOPE satellite","authors":"A. Hauschild, O. Montenbruck, R. Langley","doi":"10.1002/navi.348","DOIUrl":"https://doi.org/10.1002/navi.348","url":null,"abstract":"The paper presents attitude determination results of the “GPS Attitude, Positioning and Profiling Experiment” (GAP) on board the CASSIOPE satellite using real flight data. The GAP payload consists of five minimally-modified commercial-off the-shelf NovAtel OEM4-G2L receivers, which provide dual-frequency GPS measurements and allow for attitude and Orbit determination of the satellite as well as electron density profiling. To the authors’ knowledge, the CASSIOPE mission is the first space mission that provides dual-frequency observations for attitude determination. The data has been analyzed with a GPS attitude determination algorithm originally developed for the analysis of data from the “Flying Laptop” mission. The GPS-based solution for selected attitude maneuvers is compared to a reference orientation provided by the satellite’s star sensors. Furthermore, an analysis of the typical time-to-first-fix (TTFF) of attitude solution is provided. The advantage of dual-frequency ambiguity fixing compared to single-frequency is assessed.","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"83-93"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.348","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45154625","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}
引用次数: 3
Integration of positioning and activity context information for lifelog in urban city area 城市生活日志定位与活动背景信息整合
Annual of Navigation Pub Date : 2020-03-01 DOI: 10.1002/navi.343
Yanlei Gu, Dailin Li, Yoshihiko Kamiya, S. Kamijo
{"title":"Integration of positioning and activity context information for lifelog in urban city area","authors":"Yanlei Gu, Dailin Li, Yoshihiko Kamiya, S. Kamijo","doi":"10.1002/navi.343","DOIUrl":"https://doi.org/10.1002/navi.343","url":null,"abstract":"Smartphone-based Lifelog (automatically annotating the users' daily experience from multisensory streams on smartphones) is in great need. Accurate positioning under any situation is one of the most significant techniques for a desirable Lifelog. This paper proposes to detect location-related activities and use the activity information to improve positioning accuracy. In the proposed system, a human activity recognition module is developed to extract location-related activities from multisensory streams of smartphones. After that, the proposed system integrates activity information with PDR-based positioning results in a context-based map-matching framework. The developed system can be used for both outdoor and indoor scenarios. Moreover, the developed indoor positioning method is used to determine the positions of calibration points automatically in an auto-calibration Wi-Fi positioning system. The proposed methods achieve 3.1-m accuracy in outdoor and average 2.2-m accuracy in indoor situations.","PeriodicalId":30601,"journal":{"name":"Annual of Navigation","volume":"67 1","pages":"163-179"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/navi.343","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46900251","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}
引用次数: 8
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