A Novel Single Differencing Measurement for Multipath Detection
Increased global dependence on Global Navigation Satellite Systems (GNSSs) has resulted in a high demand for greater precision and reliable measurements from GNSS receivers. The multipath problem is the single largest source of errors in modernised GNSSs. Double differencing techniques, such as Code...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-4292/15/22/5312 |
| _version_ | 1827638809748045824 |
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| author | Matthew Alcock Paul Blunt |
| author_facet | Matthew Alcock Paul Blunt |
| author_sort | Matthew Alcock |
| collection | DOAJ |
| description | Increased global dependence on Global Navigation Satellite Systems (GNSSs) has resulted in a high demand for greater precision and reliable measurements from GNSS receivers. The multipath problem is the single largest source of errors in modernised GNSSs. Double differencing techniques, such as Code Minus Carrier (CMC) have been shown to accurately detect and measure multipath, allowing for corrections to be made via Ground Base Augmentation Systems (GBAS), for example. However, these techniques require at least two receivers and the protection provided is not extended to stand-alone receivers. This paper introduces a new single differencing technique for the accurate detection of multipath in standalone GNSS receivers receiving modernised Binary Offset Carrier (BOC)-modulated signals. Similarities to CMC are drawn before the novel measurement, Code minus Subcarrier, (CMS) is characterised statistically and a threshold for multipath detection is determined. The effectiveness and sensitivity of this novel measurement as a multipath detection technique are analysed through simulation and multipath error envelope analysis. It will be shown that multipath echos capable of inducing a psuedorange error larger than the threshold are detectable at any amplitude. The method is finally verified using simulated fixed offset multipath, confirming that when code and subcarrier early–late spacings are optimal, all ranges of multipath delays, even as small as 21 meters, are detectable. This novel method of multipath detection requires no additional complex correlators than already exist in the chosen tracking algorithm, thus, providing excellent detection with minimum complexity added to the receiver structure. |
| first_indexed | 2024-03-09T16:29:02Z |
| format | Article |
| id | doaj.art-0265043c98154d2291f21018532f0604 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T16:29:02Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-0265043c98154d2291f21018532f06042023-11-24T15:04:20ZengMDPI AGRemote Sensing2072-42922023-11-011522531210.3390/rs15225312A Novel Single Differencing Measurement for Multipath DetectionMatthew Alcock0Paul Blunt1Nottingham Geospatial Institute, The University of Nottingham, Nottingham NG7 2TU, UKNottingham Geospatial Institute, The University of Nottingham, Nottingham NG7 2TU, UKIncreased global dependence on Global Navigation Satellite Systems (GNSSs) has resulted in a high demand for greater precision and reliable measurements from GNSS receivers. The multipath problem is the single largest source of errors in modernised GNSSs. Double differencing techniques, such as Code Minus Carrier (CMC) have been shown to accurately detect and measure multipath, allowing for corrections to be made via Ground Base Augmentation Systems (GBAS), for example. However, these techniques require at least two receivers and the protection provided is not extended to stand-alone receivers. This paper introduces a new single differencing technique for the accurate detection of multipath in standalone GNSS receivers receiving modernised Binary Offset Carrier (BOC)-modulated signals. Similarities to CMC are drawn before the novel measurement, Code minus Subcarrier, (CMS) is characterised statistically and a threshold for multipath detection is determined. The effectiveness and sensitivity of this novel measurement as a multipath detection technique are analysed through simulation and multipath error envelope analysis. It will be shown that multipath echos capable of inducing a psuedorange error larger than the threshold are detectable at any amplitude. The method is finally verified using simulated fixed offset multipath, confirming that when code and subcarrier early–late spacings are optimal, all ranges of multipath delays, even as small as 21 meters, are detectable. This novel method of multipath detection requires no additional complex correlators than already exist in the chosen tracking algorithm, thus, providing excellent detection with minimum complexity added to the receiver structure.https://www.mdpi.com/2072-4292/15/22/5312multipathdetectiondifferencingBOCmodernised GNSS |
| spellingShingle | Matthew Alcock Paul Blunt A Novel Single Differencing Measurement for Multipath Detection Remote Sensing multipath detection differencing BOC modernised GNSS |
| title | A Novel Single Differencing Measurement for Multipath Detection |
| title_full | A Novel Single Differencing Measurement for Multipath Detection |
| title_fullStr | A Novel Single Differencing Measurement for Multipath Detection |
| title_full_unstemmed | A Novel Single Differencing Measurement for Multipath Detection |
| title_short | A Novel Single Differencing Measurement for Multipath Detection |
| title_sort | novel single differencing measurement for multipath detection |
| topic | multipath detection differencing BOC modernised GNSS |
| url | https://www.mdpi.com/2072-4292/15/22/5312 |
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