Accurate positioning is highly desirable in urban canyons where satellite signals are easily reflected or blocked by buildings, leading to severe multipath effects or non-light-of-sight (NLOS) receptions. Anti-multipath techniques, e.g., careful antenna or correlator designs, however, have little improvement for NLOS reception. Existing NLOS detection techniques, e.g., the usage of dual- polarization antenna, or fish-eye camera, require external aiding, which is not suitable for low-cost global positioning system (GPS) receivers, e.g., smartphones or wearable devices. In this paper, we use features, such as multi-correlator or code discriminator outputs, extracted at the signal tracking level, to detect NLOS reception in a vector tracking-based software receiver. Multiple correlators with small spacings also help to find the NLOS path delay, which will be further compensated for updating the extended Kalman filter for positioning. Experimental results using real GPS signals in an urban area in Hong Kong show that the proposed method is capable of detecting the NLOS reception and preventing the positioning error from increasing during the NLOS reception period. By comparison, conventional tracking loops would lock onto the incoming NLOS signal and cannot detect its existence, thus reporting an increased positioning error.
{"title":"NLOS Detection and Compensation using a Vector Tracking-based GPS Software Receiver","authors":"Bing Xu, L. Hsu","doi":"10.33012/2019.16777","DOIUrl":"https://doi.org/10.33012/2019.16777","url":null,"abstract":"Accurate positioning is highly desirable in urban canyons where satellite signals are easily reflected or blocked by buildings, leading to severe multipath effects or non-light-of-sight (NLOS) receptions. Anti-multipath techniques, e.g., careful antenna or correlator designs, however, have little improvement for NLOS reception. Existing NLOS detection techniques, e.g., the usage of dual- polarization antenna, or fish-eye camera, require external aiding, which is not suitable for low-cost global positioning system (GPS) receivers, e.g., smartphones or wearable devices. In this paper, we use features, such as multi-correlator or code discriminator outputs, extracted at the signal tracking level, to detect NLOS reception in a vector tracking-based software receiver. Multiple correlators with small spacings also help to find the NLOS path delay, which will be further compensated for updating the extended Kalman filter for positioning. Experimental results using real GPS signals in an urban area in Hong Kong show that the proposed method is capable of detecting the NLOS reception and preventing the positioning error from increasing during the NLOS reception period. By comparison, conventional tracking loops would lock onto the incoming NLOS signal and cannot detect its existence, thus reporting an increased positioning error.","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"91 13 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":"126037259","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":"Indoor Altitude Determination Using MEMS-based Sensors in Smartphones","authors":"G. Retscher","doi":"10.33012/2019.16827","DOIUrl":"https://doi.org/10.33012/2019.16827","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121554430","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}
Hiroko Tokura, Takayuki Kaneso, S. Owada, Takashi Urushido, Mitsunori Kitamura
{"title":"Development Status of DFMC-SBAS using QZSS PTD (Positioning Technology Development) Subsystem","authors":"Hiroko Tokura, Takayuki Kaneso, S. Owada, Takashi Urushido, Mitsunori Kitamura","doi":"10.33012/2019.16839","DOIUrl":"https://doi.org/10.33012/2019.16839","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"27 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":"132097835","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":"New UAV Velocity Estimation Using Array of Hall Effect Sensors for Indoor Navigation","authors":"S. Zahran, A. Moussa, N. El-Sheimy, A. Sesay","doi":"10.33012/2019.16815","DOIUrl":"https://doi.org/10.33012/2019.16815","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"77 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":"124302721","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}
H. Ai, S. Zhang, Kaifeng Tang, Ning Li, Weiyi Huang, Yifeng Wang
{"title":"Robust Low-Latency Indoor Localization Using Bluetooth Low Energy","authors":"H. Ai, S. Zhang, Kaifeng Tang, Ning Li, Weiyi Huang, Yifeng Wang","doi":"10.33012/2019.16793","DOIUrl":"https://doi.org/10.33012/2019.16793","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"72 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":"126351187","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}
Daiki Matsumoto, Takayuki Kaneso, Takashi Urushido, S. Owada
Quasi-Zenith Satellite System (QZSS) is the Japanese satellite positioning system composed of satellites in quasi-zenith orbits, satellites in geostationary orbits, and ground-based systems. One of the services in QZSS is Sub-meter Level Augmentation Service (SLAS). SLAS broadcasts sub-meter level augmentation signal named L1S. L1S signal can be utilized to improve satellite positioning error. This paper provides a summary of the result of performance evaluation of SLAS in QZSS.
{"title":"Evaluation of QZSS SLAS (Sub-meter Level Augmentation Service) Performance","authors":"Daiki Matsumoto, Takayuki Kaneso, Takashi Urushido, S. Owada","doi":"10.33012/2019.16811","DOIUrl":"https://doi.org/10.33012/2019.16811","url":null,"abstract":"Quasi-Zenith Satellite System (QZSS) is the Japanese satellite positioning system composed of satellites in quasi-zenith orbits, satellites in geostationary orbits, and ground-based systems. One of the services in QZSS is Sub-meter Level Augmentation Service (SLAS). SLAS broadcasts sub-meter level augmentation signal named L1S. L1S signal can be utilized to improve satellite positioning error. This paper provides a summary of the result of performance evaluation of SLAS in QZSS.","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"23 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":"126645778","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":"Deep Neural Network Based Multipath Mitigation Method for Carrier Based Differential GNSS Systems","authors":"D. Min, Minchan Kim, Jinsil Lee, Jiyun Lee","doi":"10.33012/2019.16856","DOIUrl":"https://doi.org/10.33012/2019.16856","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":"125807499","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":"Range-based 3D Mapping Aided GNSS with NLOS Correction based on Skyplot with Building Boundaries","authors":"Hoi-Fung Ng, Guohao Zhang, L. Hsu","doi":"10.33012/2019.16774","DOIUrl":"https://doi.org/10.33012/2019.16774","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"30 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":"116885399","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. Juang, Sheng-Hsiung Ma, Y. Tsai, Chen-Tsung Lin
{"title":"Function and Performance Assessment of a GNSS-R Receiver in Airborne Tests","authors":"J. Juang, Sheng-Hsiung Ma, Y. Tsai, Chen-Tsung Lin","doi":"10.33012/2019.16830","DOIUrl":"https://doi.org/10.33012/2019.16830","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":"129857805","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":"Towards a Comprehensive Approach for Obtaining Resilient PNT","authors":"L. Scott","doi":"10.31701/ITSNT2018.01","DOIUrl":"https://doi.org/10.31701/ITSNT2018.01","url":null,"abstract":"","PeriodicalId":201935,"journal":{"name":"Proceedings of the ION 2019 Pacific PNT Meeting","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125156956","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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