Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642649
I. Lapin, J. Samson, S. Wallner, M. Mabilleau, P. Durel
The aim of the paper is to analyse the distribution of update periods of Issue of Data (IOD) parameters in Galileo F/NAV and Navstar Global Positioning System (GPS) LNAV messages. For this purpose, a new method aiming at the reconstruction of IOD update periods reported by a network of monitoring stations is proposed. Over one year of Galileo F/NAV and over three years of GPS LNAV data is processed and consolidated using the proposed method. A reconstruction rate of 99.66% is achieved for the Galileo F/NAV messages. To extract the information on the consecutive update periods of IOD parameters, two metrics are proposed. It was observed that Galileo F/NAV messages can experience fast single and fast double updates. Double updates happen at worst over two subsequent Galileo F/NAV sub-frames. The obtained results suggest a possible impact on Satellite-Based Augmentation System (SBAS). In order to assess the impact on a drafted Dual Frequency Multi Constellation (DFMC) SBAS Standards And Recommended Practices (SARPs), a Galileo F/NAV IOD selector, whose task is to select a specific IOD for augmentation in SBAS, is proposed and implemented. The design of the Galileo F/NAV IOD selector takes into account the observed IOD update periods as well as relevant requirement defined in the drafted DFMC SBAS Minimum Operational Performance Standards (MOPS). The selector aims at maximising the minimum time that the SBAS user has to decode the navigation message identified by the IOD before it is selected for augmentation. In addition, the maximum time that the SBAS would be using IOD, which is no longer transmitted by the Satellite Vehicle (Sv), is also over bounded by the design. According to the analysed data, it is identified that an optimal time to trigger the selection of new IOD of Galileo F/NAV message for augmentation is 350s when maximising the minimum decoding time. The trigger time guarantees that the SBAS user would always have at least 200s available to decode the Galileo F/NAV message.
{"title":"Impact of Issue of Data Update Periods on Satellite-Based Augmentation Systems","authors":"I. Lapin, J. Samson, S. Wallner, M. Mabilleau, P. Durel","doi":"10.1109/NAVITEC.2018.8642649","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642649","url":null,"abstract":"The aim of the paper is to analyse the distribution of update periods of Issue of Data (IOD) parameters in Galileo F/NAV and Navstar Global Positioning System (GPS) LNAV messages. For this purpose, a new method aiming at the reconstruction of IOD update periods reported by a network of monitoring stations is proposed. Over one year of Galileo F/NAV and over three years of GPS LNAV data is processed and consolidated using the proposed method. A reconstruction rate of 99.66% is achieved for the Galileo F/NAV messages. To extract the information on the consecutive update periods of IOD parameters, two metrics are proposed. It was observed that Galileo F/NAV messages can experience fast single and fast double updates. Double updates happen at worst over two subsequent Galileo F/NAV sub-frames. The obtained results suggest a possible impact on Satellite-Based Augmentation System (SBAS). In order to assess the impact on a drafted Dual Frequency Multi Constellation (DFMC) SBAS Standards And Recommended Practices (SARPs), a Galileo F/NAV IOD selector, whose task is to select a specific IOD for augmentation in SBAS, is proposed and implemented. The design of the Galileo F/NAV IOD selector takes into account the observed IOD update periods as well as relevant requirement defined in the drafted DFMC SBAS Minimum Operational Performance Standards (MOPS). The selector aims at maximising the minimum time that the SBAS user has to decode the navigation message identified by the IOD before it is selected for augmentation. In addition, the maximum time that the SBAS would be using IOD, which is no longer transmitted by the Satellite Vehicle (Sv), is also over bounded by the design. According to the analysed data, it is identified that an optimal time to trigger the selection of new IOD of Galileo F/NAV message for augmentation is 350s when maximising the minimum decoding time. The trigger time guarantees that the SBAS user would always have at least 200s available to decode the Galileo F/NAV message.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117133677","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642648
Jose M. V. Marcal, F. Nunes, F. Sousa
Vector tracking algorithms have been used in both frequency and code tracking of GNSS signals in the last years with success. Vector phase tracking algorithms still present a challenge due to the order of magnitude of the errors when compared to the wavelength of the carrier wave, especially in situations where strong disturbances are present in one or more satellites. Partitioned vector tracking for carrier phase signals has been used in simulation scenarios with good results. In this work the performance with real scintillation data is shown. Furthermore, an adaptive method with dynamic optimization of the weights in the partitioned vector tracking is included, in order to adjust the tracking structure to the variation of environmental parameters.
{"title":"Performance of an adaptive partitioned vector tracking algorithm with real scintillation data","authors":"Jose M. V. Marcal, F. Nunes, F. Sousa","doi":"10.1109/NAVITEC.2018.8642648","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642648","url":null,"abstract":"Vector tracking algorithms have been used in both frequency and code tracking of GNSS signals in the last years with success. Vector phase tracking algorithms still present a challenge due to the order of magnitude of the errors when compared to the wavelength of the carrier wave, especially in situations where strong disturbances are present in one or more satellites. Partitioned vector tracking for carrier phase signals has been used in simulation scenarios with good results. In this work the performance with real scintillation data is shown. Furthermore, an adaptive method with dynamic optimization of the weights in the partitioned vector tracking is included, in order to adjust the tracking structure to the variation of environmental parameters.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134021077","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642707
D. Ibáñez, A. Rovira‐Garcia, J. Sanz, J. Juan, G. González‐Casado, D. Jimenez-Banos, C. López-Echazarreta, I. Lapin
This work presents recent and ongoing updates to the free and open-source advanced interactive multi-purpose package for processing and analysing Global Navigation Satellite System (GNSS) data, named GNSS-Lab Tool suite (gLAB). The updates have been performed in the framework of two projects funded by the European Space Agency (ESA), namely, the “gLAB upgrade for European Geostationary Navigation Overlay System (EGNOS) Data processing” and “Upgrade of gLAB Tool for Double Frequency Multi-Constellation (DFMC)”. We examine various sets of results obtained with actual data using the Satellite Based Augmentation System (SBAS) corrections and the Differential GNSS (DGNSS) mode. Specifically, we introduce the Global Monitoring System (GMS) that routinely assesses the performance of the SBAS and DGNSS solutions using multiple station networks. That is, the Stanford-ESA integrity diagram, the Worst Integrity Ratio (WIR) maps, continuity risk, among other types of performance monitoring. Lastly, we present the ongoing update to the gLAB tool that focusses on the implementation of multi-frequency and multi-constellation data processing capabilities.
{"title":"The GNSS Laboratory Tool Suite (gLAB) updates: SBAS, DGNSS and Global Monitoring System","authors":"D. Ibáñez, A. Rovira‐Garcia, J. Sanz, J. Juan, G. González‐Casado, D. Jimenez-Banos, C. López-Echazarreta, I. Lapin","doi":"10.1109/NAVITEC.2018.8642707","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642707","url":null,"abstract":"This work presents recent and ongoing updates to the free and open-source advanced interactive multi-purpose package for processing and analysing Global Navigation Satellite System (GNSS) data, named GNSS-Lab Tool suite (gLAB). The updates have been performed in the framework of two projects funded by the European Space Agency (ESA), namely, the “gLAB upgrade for European Geostationary Navigation Overlay System (EGNOS) Data processing” and “Upgrade of gLAB Tool for Double Frequency Multi-Constellation (DFMC)”. We examine various sets of results obtained with actual data using the Satellite Based Augmentation System (SBAS) corrections and the Differential GNSS (DGNSS) mode. Specifically, we introduce the Global Monitoring System (GMS) that routinely assesses the performance of the SBAS and DGNSS solutions using multiple station networks. That is, the Stanford-ESA integrity diagram, the Worst Integrity Ratio (WIR) maps, continuity risk, among other types of performance monitoring. Lastly, we present the ongoing update to the gLAB tool that focusses on the implementation of multi-frequency and multi-constellation data processing capabilities.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121427144","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642646
Rémi Chauvat, A. G. Pena, M. Anghileri, J. Floch, M. Paonni
Data rate increase in global navigation satellite systems (GNSS) is necessary to provide new features (e.g. precise positioning, security code authentication (SCA) key management). In addition, the data transmission reliability in urban environments can be improved using an induced increase of temporal diversity; the latter being obtained by retransmitting data bits thanks to the data rate improvement. The code shift keying (CSK) modulation is a solution for augmenting data rates of direct-sequence spread-spectrum (DSSS) signals. In addition, last developed GNSS signals make use of modern channel codes in order to further improve the reliability of GNSS data recovery. Hence, this article aims at proposing new binary low-density parity-check (LDPC) codes constructed for the CSK modulation in a bit-interleaved coded modulation (BICM) context. Codes achieving good error rate performance for both BICM and BICM with iterative demapping/decoding (BICM-ID) are presented. The code construction methodology is detailed and the good performance achieved by the constructed codes is assessed in additive white Gaussian noise (AWGN) channel.
{"title":"Ultra-Sparse Binary LDPC Codes with CSK Signals for Increased Data Rates in Future GNSS","authors":"Rémi Chauvat, A. G. Pena, M. Anghileri, J. Floch, M. Paonni","doi":"10.1109/NAVITEC.2018.8642646","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642646","url":null,"abstract":"Data rate increase in global navigation satellite systems (GNSS) is necessary to provide new features (e.g. precise positioning, security code authentication (SCA) key management). In addition, the data transmission reliability in urban environments can be improved using an induced increase of temporal diversity; the latter being obtained by retransmitting data bits thanks to the data rate improvement. The code shift keying (CSK) modulation is a solution for augmenting data rates of direct-sequence spread-spectrum (DSSS) signals. In addition, last developed GNSS signals make use of modern channel codes in order to further improve the reliability of GNSS data recovery. Hence, this article aims at proposing new binary low-density parity-check (LDPC) codes constructed for the CSK modulation in a bit-interleaved coded modulation (BICM) context. Codes achieving good error rate performance for both BICM and BICM with iterative demapping/decoding (BICM-ID) are presented. The code construction methodology is detailed and the good performance achieved by the constructed codes is assessed in additive white Gaussian noise (AWGN) channel.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121288119","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642666
O. Apilo, Mikko Hiivala, Atte Kuosmonen, Jani Kallankari, H. Amin, M. Lasanen, M. Berg, A. Pärssinen
In this paper we present the measurement results for time-to-fix, position accuracy, and carrier-to-noise ratio of mass-market Global Positioning System (GPS) receivers under the in-device interference from an LTE-M transmitter. The laboratory measurement set-up is built using software-defined radio (SDR) platforms to conductively feed emulated GPS L1 signals and LTE-M interference signals to the antenna input of the GPS receivers. The LTE-M interference from second harmonics is accurately modelled taking into account the transmitter activity patterns in different coverage enhancement modes. According to measurements, there are large variations in interference tolerance between different GPS receivers. REC01 was able to tolerate high level of interference during tracking and also in acquisition as long as the interference pulse duration is not too long (tens of milliseconds). REC02 performed clearly worse and tolerated only low levels of LTE-M interference during both acquisition and tracking. The same measurement set-up can be used with any GPS receiver for designing proper isolation and filtering levels for co-existing LTE-M transmitters.
{"title":"Measured GPS performance under LTE-M in-device interference","authors":"O. Apilo, Mikko Hiivala, Atte Kuosmonen, Jani Kallankari, H. Amin, M. Lasanen, M. Berg, A. Pärssinen","doi":"10.1109/NAVITEC.2018.8642666","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642666","url":null,"abstract":"In this paper we present the measurement results for time-to-fix, position accuracy, and carrier-to-noise ratio of mass-market Global Positioning System (GPS) receivers under the in-device interference from an LTE-M transmitter. The laboratory measurement set-up is built using software-defined radio (SDR) platforms to conductively feed emulated GPS L1 signals and LTE-M interference signals to the antenna input of the GPS receivers. The LTE-M interference from second harmonics is accurately modelled taking into account the transmitter activity patterns in different coverage enhancement modes. According to measurements, there are large variations in interference tolerance between different GPS receivers. REC01 was able to tolerate high level of interference during tracking and also in acquisition as long as the interference pulse duration is not too long (tens of milliseconds). REC02 performed clearly worse and tolerated only low levels of LTE-M interference during both acquisition and tracking. The same measurement set-up can be used with any GPS receiver for designing proper isolation and filtering levels for co-existing LTE-M transmitters.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122146802","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642647
F. Sousa, F. Nunes
The determination of the ionospheric scintillation processes that affect the reception of Global Navigation Satellite System (GNSS) signals is an important issue as it permits to monitor the ionosphere for practical and scientific applications and optimize the receiver performance in scintillation-prone scenarios using, for instance, a differential GNSS configuration. We propose an hybrid architecture for the receiver being constituted by a vector tracking block that estimates the receiver’s clock drift coupled with an ensemble of extended Kalman filters driven by the prompt correlators that estimate the amplitude and phase of the fading processes. Those processes include as an important case the ionospheric scintillation.
{"title":"State-space Estimation of Ionospheric Scintillation Processes with a Static GNSS Receiver","authors":"F. Sousa, F. Nunes","doi":"10.1109/NAVITEC.2018.8642647","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642647","url":null,"abstract":"The determination of the ionospheric scintillation processes that affect the reception of Global Navigation Satellite System (GNSS) signals is an important issue as it permits to monitor the ionosphere for practical and scientific applications and optimize the receiver performance in scintillation-prone scenarios using, for instance, a differential GNSS configuration. We propose an hybrid architecture for the receiver being constituted by a vector tracking block that estimates the receiver’s clock drift coupled with an ensemble of extended Kalman filters driven by the prompt correlators that estimate the amplitude and phase of the fading processes. Those processes include as an important case the ionospheric scintillation.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115647877","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642671
P. Thevenon, Jérémy Vezinet, Patrick Estrade
Low-cost single frequency Real-Time Kinematics (RTK) modules have recently been released by several manufacturers. This type of receivers allows to obtain much better accuracy, reaching decimeter-level accuracy, than traditional low-cost receivers, thus opening the world of precise GNSS positioning to a new sector. However, while this type of system will provide very good relative positioning accuracy, the absolute positioning accuracy might be degraded if the position of the RTK base station is not estimated with sufficient accuracy. Any bias on the RTK base station position will introduce the same bias on the RTK rover position. This paper proposes a modification to the position estimation algorithm that includes the real-time estimation of the RTK base station position error, by combining both the Single Point Positioning Solution and the RTK solution. The algorithm is illustrated using 2 types of real data: first, for a fixed reference station using GNSS observations only, then for a moving vehicle using a sensor fusion algorithm between GNSS, inertial and odometer observations. Performance analysis shows that the bias affecting the absolute position of the RTK rover can be estimated using the proposed algorithm, decreasing the horizontal bias from a few meters to a few decimeters.
{"title":"Estimation of the Base Station Position Error in a RTK Receiver Using State Augmentation in a Kalman Filter","authors":"P. Thevenon, Jérémy Vezinet, Patrick Estrade","doi":"10.1109/NAVITEC.2018.8642671","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642671","url":null,"abstract":"Low-cost single frequency Real-Time Kinematics (RTK) modules have recently been released by several manufacturers. This type of receivers allows to obtain much better accuracy, reaching decimeter-level accuracy, than traditional low-cost receivers, thus opening the world of precise GNSS positioning to a new sector. However, while this type of system will provide very good relative positioning accuracy, the absolute positioning accuracy might be degraded if the position of the RTK base station is not estimated with sufficient accuracy. Any bias on the RTK base station position will introduce the same bias on the RTK rover position. This paper proposes a modification to the position estimation algorithm that includes the real-time estimation of the RTK base station position error, by combining both the Single Point Positioning Solution and the RTK solution. The algorithm is illustrated using 2 types of real data: first, for a fixed reference station using GNSS observations only, then for a moving vehicle using a sensor fusion algorithm between GNSS, inertial and odometer observations. Performance analysis shows that the bias affecting the absolute position of the RTK rover can be estimated using the proposed algorithm, decreasing the horizontal bias from a few meters to a few decimeters.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131056456","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642705
V. Nguyen, Gianluca Falco, M. Nicola, E. Falletti
This paper presents the development of a dual-antenna GNSS spoofing detection technique based on the analysis of the dispersion of the double differences of carrier phase measurements produced by two GNSS receivers. No synchronization of the receivers is needed for the algorithm to properly work. The algorithm is derived from the idea of the Sum of Squares (SoS) detector, recently presented as a simple and efficient way to detect a common angle of arrival for all the GNSS signals arriving to a pair of antennas. The presence of such a common angle is recognized as an undiscussed indication of non-authentic GNSS signals. Nonetheless, some limitations can be identified in the SoS algorithm. First of all, the assumption that all the signals arrive from the same source; situations are possible in which the receiver tracks only a subset of counterfeit signals, out of the whole signal ensemble. The idea presented in this paper intends to overcome such limitations, properly modifying the SoS detection metric to identify subsets of counterfeit signals. The analysis is supported by several simulation tests, in both nominal and spoofed signal conditions, to prove the effectiveness of the proposed method.
{"title":"A Dual Antenna GNSS Spoofing Detector Based on the Dispersion of Double Difference Measurements","authors":"V. Nguyen, Gianluca Falco, M. Nicola, E. Falletti","doi":"10.1109/NAVITEC.2018.8642705","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642705","url":null,"abstract":"This paper presents the development of a dual-antenna GNSS spoofing detection technique based on the analysis of the dispersion of the double differences of carrier phase measurements produced by two GNSS receivers. No synchronization of the receivers is needed for the algorithm to properly work. The algorithm is derived from the idea of the Sum of Squares (SoS) detector, recently presented as a simple and efficient way to detect a common angle of arrival for all the GNSS signals arriving to a pair of antennas. The presence of such a common angle is recognized as an undiscussed indication of non-authentic GNSS signals. Nonetheless, some limitations can be identified in the SoS algorithm. First of all, the assumption that all the signals arrive from the same source; situations are possible in which the receiver tracks only a subset of counterfeit signals, out of the whole signal ensemble. The idea presented in this paper intends to overcome such limitations, properly modifying the SoS detection metric to identify subsets of counterfeit signals. The analysis is supported by several simulation tests, in both nominal and spoofed signal conditions, to prove the effectiveness of the proposed method.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122248990","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642644
Wenjian Qin, F. Dovis
The use of Global Navigation Satellite Systems (GNSS) signals as signal of opportunity for ionospheric sounding is becoming quite popular. In particular, for scintillation monitoring, it is essential that the affected GNSS signal is not distorted by any other artificial interference. As a matter of fact, the Ionospheric Scintillation Monitoring Receivers (ISMR) used to observe scintillation activities could operate in scenarios where communication systems or even jammers are present. Such sources can provide scintillation-like performance in the signal processing stage, leading to misconceptions about the behavior of actual scintillation phenomena. This paper investigates the estimation of the S4 index, generally used to detect the presence of a scintillation event, under five types of anthropogenic interference, including continuous wave, narrow band, wide band, chirp and pulsed interference. Furthermore, the study also addresses the use of notch filtering and wavelet packet decomposition to mitigate the anthropogenic interference from a scenario in which both scintillation and artificial interference are present, and the S4 is estimated on the mitigated data.
{"title":"Effects of Interference Mitigation Methods on Scintillation Detection","authors":"Wenjian Qin, F. Dovis","doi":"10.1109/NAVITEC.2018.8642644","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642644","url":null,"abstract":"The use of Global Navigation Satellite Systems (GNSS) signals as signal of opportunity for ionospheric sounding is becoming quite popular. In particular, for scintillation monitoring, it is essential that the affected GNSS signal is not distorted by any other artificial interference. As a matter of fact, the Ionospheric Scintillation Monitoring Receivers (ISMR) used to observe scintillation activities could operate in scenarios where communication systems or even jammers are present. Such sources can provide scintillation-like performance in the signal processing stage, leading to misconceptions about the behavior of actual scintillation phenomena. This paper investigates the estimation of the S4 index, generally used to detect the presence of a scintillation event, under five types of anthropogenic interference, including continuous wave, narrow band, wide band, chirp and pulsed interference. Furthermore, the study also addresses the use of notch filtering and wavelet packet decomposition to mitigate the anthropogenic interference from a scenario in which both scintillation and artificial interference are present, and the S4 is estimated on the mitigated data.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128228601","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}
Pub Date : 2018-12-01DOI: 10.1109/NAVITEC.2018.8642703
J. García-Molina, J. Fernández-Rubio
This paper discusses about GNSS-based positioning and timing in challenging propagation conditions for receivers featuring an array of antennas with an arbitrary distribution. In particular, the positioning and timing problems are treated as multiple-input multiple-output (MIMO) estimation problems in which all the GNSS signals received by the array of antennas are jointly exploited in the corresponding domain. The MIMO-GNSS processing approach is targeting the derivation of robust solutions in the presence of realistic signal impairments introduced by the propagation channel or any other external interference. The maximum likelihood estimator (MLE) in the MIMO-GNSS framework is reviewed, and simulation results in realistic challenging scenarios are presented, showing the benefits introduced by the exploitation of arrays of antennas in both positioning and timing.
{"title":"Positioning and Timing in the MIMO-GNSS Framework","authors":"J. García-Molina, J. Fernández-Rubio","doi":"10.1109/NAVITEC.2018.8642703","DOIUrl":"https://doi.org/10.1109/NAVITEC.2018.8642703","url":null,"abstract":"This paper discusses about GNSS-based positioning and timing in challenging propagation conditions for receivers featuring an array of antennas with an arbitrary distribution. In particular, the positioning and timing problems are treated as multiple-input multiple-output (MIMO) estimation problems in which all the GNSS signals received by the array of antennas are jointly exploited in the corresponding domain. The MIMO-GNSS processing approach is targeting the derivation of robust solutions in the presence of realistic signal impairments introduced by the propagation channel or any other external interference. The maximum likelihood estimator (MLE) in the MIMO-GNSS framework is reviewed, and simulation results in realistic challenging scenarios are presented, showing the benefits introduced by the exploitation of arrays of antennas in both positioning and timing.","PeriodicalId":355786,"journal":{"name":"2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125356252","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：