Pub Date : 2014-12-03DOI: 10.1109/NAVITEC.2014.7045155
M. Sahmoudi, Aude Bourdeau, J. Tourneret
In urban canyons, the GNSS satellite signals may travel an additional distance due to reflection and diffraction before reaching the receiver antenna. Where no direct path is available, this is called a non-line of- sight (NLOS) propagation and adds a positive bias to the geometric measured pseudorange. In this paper, we address the issue of GNSS positioning in harsh environments using constructively the NLOS signals. To exploit these biased signals, we compensate for the NLOS bias using a 3D GNSS simulation model of the environment. We use the 3D model as a priori information to characterize the additional NLOS bias. In this work, we propose a deep integration of the 3D model-based signal characterization into an advanced GNSS receiver architecture called vector tracking loops. The proposed architecture is a combination of a vector tracking receiver and a co-processor of external local information to correct the GNSS measurements. Obtained results with real GPS signals illustrates the effectiveness of this approach to improve the accuracy and reliability of the navigation solution in urban canyons.
{"title":"Deep fusion of vector tracking GNSS receivers and a 3D city model for robust positioning in urban canyons with NLOS signals","authors":"M. Sahmoudi, Aude Bourdeau, J. Tourneret","doi":"10.1109/NAVITEC.2014.7045155","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045155","url":null,"abstract":"In urban canyons, the GNSS satellite signals may travel an additional distance due to reflection and diffraction before reaching the receiver antenna. Where no direct path is available, this is called a non-line of- sight (NLOS) propagation and adds a positive bias to the geometric measured pseudorange. In this paper, we address the issue of GNSS positioning in harsh environments using constructively the NLOS signals. To exploit these biased signals, we compensate for the NLOS bias using a 3D GNSS simulation model of the environment. We use the 3D model as a priori information to characterize the additional NLOS bias. In this work, we propose a deep integration of the 3D model-based signal characterization into an advanced GNSS receiver architecture called vector tracking loops. The proposed architecture is a combination of a vector tracking receiver and a co-processor of external local information to correct the GNSS measurements. Obtained results with real GPS signals illustrates the effectiveness of this approach to improve the accuracy and reliability of the navigation solution in urban canyons.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126635581","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045151
M. Manzano-Jurado, Julia Alegre-Rubio, A. Pellacani, G. Seco-Granados, J. López-Salcedo, E. Guerrero, A. García-Rodríguez
According to the European Space Agency (ESA) Lunar Exploration program, the use of GNSS weak-signal navigation in future lunar exploration missions has the potential to increase the robustness of the navigation during all mission phases and improve considerably its autonomy. The major objectives of the ESA Moon-GNSS project have been to determine the feasibility of using GNSS (GPS/Galileo) weak-signal technology in future lunar missions to improve the navigation performance in terms of accuracy, cost reduction and autonomy. The Moon mission scenario is very challenging for the GNSS signals processing: less visibility compared to an Earth-based receiver, low signal strength, poor satellite geometry, Earth and Moon signal occultation, and spacecraft dynamics. The identification of the Moon-GNSS navigation receiver requirements for the upcoming lunar exploration missions has been performed. The impact of the receiver requirements on the Moon-GNSS receiver module architecture and algorithms has been analyzed (weak signal processing, filtering and navigation), including an overview of the state of the art space-borne GNSS receivers. Besides, the synergies between GNSS signal/navigation processing and other navigation sensors (i.e. accelerometers, optical camera, laser altimeter) have been analyzed, using the state of the art of sensors integration for space missions. A demonstrator of the weak-signal Moon-GNSS navigation has been designed and implemented, showing the main functional and performance capabilities of the Moon-GNSS receiver. A test campaign representative of a real Moon-GNSS mission has been carried out, covering all the mission phases of the real mission conditions in terms of dynamics and signal disturbances, for different configurations: standard sensors, standard sensors plus GNSS and stand-alone GNSS navigation.
{"title":"Use of weak GNSS signals in a mission to the moon","authors":"M. Manzano-Jurado, Julia Alegre-Rubio, A. Pellacani, G. Seco-Granados, J. López-Salcedo, E. Guerrero, A. García-Rodríguez","doi":"10.1109/NAVITEC.2014.7045151","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045151","url":null,"abstract":"According to the European Space Agency (ESA) Lunar Exploration program, the use of GNSS weak-signal navigation in future lunar exploration missions has the potential to increase the robustness of the navigation during all mission phases and improve considerably its autonomy. The major objectives of the ESA Moon-GNSS project have been to determine the feasibility of using GNSS (GPS/Galileo) weak-signal technology in future lunar missions to improve the navigation performance in terms of accuracy, cost reduction and autonomy. The Moon mission scenario is very challenging for the GNSS signals processing: less visibility compared to an Earth-based receiver, low signal strength, poor satellite geometry, Earth and Moon signal occultation, and spacecraft dynamics. The identification of the Moon-GNSS navigation receiver requirements for the upcoming lunar exploration missions has been performed. The impact of the receiver requirements on the Moon-GNSS receiver module architecture and algorithms has been analyzed (weak signal processing, filtering and navigation), including an overview of the state of the art space-borne GNSS receivers. Besides, the synergies between GNSS signal/navigation processing and other navigation sensors (i.e. accelerometers, optical camera, laser altimeter) have been analyzed, using the state of the art of sensors integration for space missions. A demonstrator of the weak-signal Moon-GNSS navigation has been designed and implemented, showing the main functional and performance capabilities of the Moon-GNSS receiver. A test campaign representative of a real Moon-GNSS mission has been carried out, covering all the mission phases of the real mission conditions in terms of dynamics and signal disturbances, for different configurations: standard sensors, standard sensors plus GNSS and stand-alone GNSS navigation.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131233254","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045156
J. M. Parro-Jimenez, R. Ioannides, M. Crisci, J. López-Salcedo
This paper addresses the problem of integrity monitoring in global navigation satellite system (GNSS) receivers. A new technique is proposed to quickly detect the presence of corrupted measurements caused by either multipath or spoofing threats. To do so, the symmetry of the correlation curve is permanently monitored, and a CUSUM-based sequential test is applied later on. Numerical results are provided to validate the technique and show its effectiveness.
{"title":"Sequential test for signal-level integrity monitoring in GNSS receivers","authors":"J. M. Parro-Jimenez, R. Ioannides, M. Crisci, J. López-Salcedo","doi":"10.1109/NAVITEC.2014.7045156","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045156","url":null,"abstract":"This paper addresses the problem of integrity monitoring in global navigation satellite system (GNSS) receivers. A new technique is proposed to quickly detect the presence of corrupted measurements caused by either multipath or spoofing threats. To do so, the symmetry of the correlation curve is permanently monitored, and a CUSUM-based sequential test is applied later on. Numerical results are provided to validate the technique and show its effectiveness.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123669868","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045143
A. Avanzi, A. García, P. Tortora
Since its origin, the navigation services provided by the GNSS system have been applied to a variety of field, some of which are beyond the original scope of the infrastructure. LEO satellites autonomous orbit determination by means of on board GNSS receiver is one of the cases. The achievable position accuracy, in the order of 10 m 3d rms, satisfies most of the mission requirements and can be implemented with a simple navigation algorithm based on loose constraining of observations. For those missions that require better real time accuracies, sub meter positioning is achievable, by means of reduced dynamic filtering, which provides strong constraining of observations thanks to a detailed orbit force model. The algorithm general architecture is well covered in literature, although its real world implementation is still limited to few cases, partially because few are the missions that require such accuracy in real time, and partially because of its implementation complexity. This paper addresses one aspect of this complexity, which is related to filter tuning, or in other words to the effective definition of a statistical description of observations and process errors. Being the filter tuning a process of trial and error in most cases, and a delicate implementation step at the same time which may lead to instability and divergence, this paper proposes a procedure to achieve stable sub meter positioning from the reduced dynamic algorithm implementation.
GNSS系统自诞生以来，提供的导航服务已被应用到各种领域，其中一些领域超出了基础设施最初的范围。利用星载GNSS接收机实现低轨道卫星自主定轨就是其中一种。可实现的定位精度约为10 m 3d rms，满足大部分任务要求，并且可以使用基于松散观测约束的简单导航算法实现。对于那些需要更好的实时精度的任务，可以通过减少动态滤波来实现亚米定位，由于详细的轨道力模型，它提供了很强的观测约束。该算法的通用架构在文献中得到了很好的介绍，尽管其在现实世界中的实现仍然局限于少数情况，部分原因是很少有任务需要实时如此精确，部分原因是其实现的复杂性。本文讨论了这种复杂性的一个方面，它与过滤器调优有关，或者换句话说，与观察和过程误差的统计描述的有效定义有关。由于滤波器调谐在大多数情况下是一个反复试验的过程，同时也是一个微妙的实现步骤，可能导致不稳定和发散，因此本文提出了一种从简化的动态算法实现中实现稳定亚米定位的方法。
{"title":"Implementation and tuning of LEO satellites real-time navigation algorithm based on single frequency GPS measurements","authors":"A. Avanzi, A. García, P. Tortora","doi":"10.1109/NAVITEC.2014.7045143","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045143","url":null,"abstract":"Since its origin, the navigation services provided by the GNSS system have been applied to a variety of field, some of which are beyond the original scope of the infrastructure. LEO satellites autonomous orbit determination by means of on board GNSS receiver is one of the cases. The achievable position accuracy, in the order of 10 m 3d rms, satisfies most of the mission requirements and can be implemented with a simple navigation algorithm based on loose constraining of observations. For those missions that require better real time accuracies, sub meter positioning is achievable, by means of reduced dynamic filtering, which provides strong constraining of observations thanks to a detailed orbit force model. The algorithm general architecture is well covered in literature, although its real world implementation is still limited to few cases, partially because few are the missions that require such accuracy in real time, and partially because of its implementation complexity. This paper addresses one aspect of this complexity, which is related to filter tuning, or in other words to the effective definition of a statistical description of observations and process errors. Being the filter tuning a process of trial and error in most cases, and a delicate implementation step at the same time which may lead to instability and divergence, this paper proposes a procedure to achieve stable sub meter positioning from the reduced dynamic algorithm implementation.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125827239","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045139
R. Andreotti, F. Zanier, A. Emmanuele, M. Luise, D. Fontanella
In this paper, Code-Shift-Keying (CSK) is investigated in combination with Forward Error Correction (FEC) coding techniques, with an additional block interleaving scheme. The target of this analysis is to evaluate the CSK capability to increase data rate or data demodulation sensitivity in GNSS scenarios as compared to the use of traditional BPSK A particular set of advanced signal baselines is reported as example of application to SBAS signal formats, assessing the data delivery performance in Additive White Gaussian Noise (AWGN) channel, two-ray multipath and Land Mobile Satellite (LMS) channel in terms of Bit Error Rate (BER).
{"title":"Code-Shift-Keying (CSK) with advanced FEC coding for GNSS applications in satellite multipath channel","authors":"R. Andreotti, F. Zanier, A. Emmanuele, M. Luise, D. Fontanella","doi":"10.1109/NAVITEC.2014.7045139","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045139","url":null,"abstract":"In this paper, Code-Shift-Keying (CSK) is investigated in combination with Forward Error Correction (FEC) coding techniques, with an additional block interleaving scheme. The target of this analysis is to evaluate the CSK capability to increase data rate or data demodulation sensitivity in GNSS scenarios as compared to the use of traditional BPSK A particular set of advanced signal baselines is reported as example of application to SBAS signal formats, assessing the data delivery performance in Additive White Gaussian Noise (AWGN) channel, two-ray multipath and Land Mobile Satellite (LMS) channel in terms of Bit Error Rate (BER).","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122357438","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045146
M. Porretta, F. Zanier, A. García-Rodríguez, O. Mongrard, M. Powe
The Automated Transfer Vehicle (ATV) uses Relative Global Positioning System (RGPS) to navigate towards the International Space Station (ISS) while performing initial rendezvous manoeuvers. The RGPS solution includes a Global Positioning System (GPS) receiver in the ISS Zvezda module, whose observations are transmitted to, and applied by, the approaching ATV. The characterization of the GPS reception environment of the ISS is, therefore, a key element when planning rendezvous operations. The reception environment of the ISS is time-variant due to the relative motion between the ISS and the GPS satellites and to the sun-tracking orientation of the ISS Solar Array (SA) panels. In order to predict, for a given configuration, the most critical multipath and masking events, a Ray-Tracing (RT) tool has been developed at the European Space Research and Technology Centre (ESTEC) of the European Space Agency (ESA). The tool is based on Geometrical Optics (GO) and evaluates, for each multipath event, the associated effects on the pseudo-range error. The tool was validated using Flight Data Measurements (FDM) collected during two measurements campaigns which took place in 2010 and 2011, respectively. In particular, the validation activities show that the tool is able to timely predict the majority of the most critical multipath events. This paper presents the RT tool, the underlying validation activities and the prediction results which were prepared to support the rendezvous operations for the "Albert Einstein" ATV mission (June 2013). For this mission, three candidate configurations for the ISS were analyzed with the RT tool. Based on the prediction results, the configuration which minimizes the occurrence of the most critical events was also identified.
{"title":"Use of a Ray-Tracing tool to predict the international space station multipath and masking environment","authors":"M. Porretta, F. Zanier, A. García-Rodríguez, O. Mongrard, M. Powe","doi":"10.1109/NAVITEC.2014.7045146","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045146","url":null,"abstract":"The Automated Transfer Vehicle (ATV) uses Relative Global Positioning System (RGPS) to navigate towards the International Space Station (ISS) while performing initial rendezvous manoeuvers. The RGPS solution includes a Global Positioning System (GPS) receiver in the ISS Zvezda module, whose observations are transmitted to, and applied by, the approaching ATV. The characterization of the GPS reception environment of the ISS is, therefore, a key element when planning rendezvous operations. The reception environment of the ISS is time-variant due to the relative motion between the ISS and the GPS satellites and to the sun-tracking orientation of the ISS Solar Array (SA) panels. In order to predict, for a given configuration, the most critical multipath and masking events, a Ray-Tracing (RT) tool has been developed at the European Space Research and Technology Centre (ESTEC) of the European Space Agency (ESA). The tool is based on Geometrical Optics (GO) and evaluates, for each multipath event, the associated effects on the pseudo-range error. The tool was validated using Flight Data Measurements (FDM) collected during two measurements campaigns which took place in 2010 and 2011, respectively. In particular, the validation activities show that the tool is able to timely predict the majority of the most critical multipath events. This paper presents the RT tool, the underlying validation activities and the prediction results which were prepared to support the rendezvous operations for the \"Albert Einstein\" ATV mission (June 2013). For this mission, three candidate configurations for the ISS were analyzed with the RT tool. Based on the prediction results, the configuration which minimizes the occurrence of the most critical events was also identified.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114653859","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045148
J. A. del Peral-Rosado, J. M. Parro-Jimenez, J. López-Salcedo, G. Seco-Granados, P. Crosta, F. Zanier, M. Crisci
Long Term Evolution (LTE) networks are rapidly deploying around the world, covering the needs of high data rates demanded by many applications. Still, less attention is paid on the positioning capabilities specified in the LTE standard. Thus, an experimental LTE positioning receiver is presented to assess the positioning accuracy in commercial LTE deployments. This receiver is based on a software defined radio (SDR) and a low-cost radio-frequency (RF) front-end, such as the universal software radio peripheral (USRP) or a DVB-T dongle with the Realtek RTL2832U chipset. These two platforms are then used to capture and post-process real LTE signals generated in the laboratory. The positioning results obtained show the viability on the use of this experimental SDR LTE positioning receiver with low-cost hardware platforms for commercial LTE networks.
{"title":"Comparative results analysis on positioning with real LTE signals and low-cost hardware platforms","authors":"J. A. del Peral-Rosado, J. M. Parro-Jimenez, J. López-Salcedo, G. Seco-Granados, P. Crosta, F. Zanier, M. Crisci","doi":"10.1109/NAVITEC.2014.7045148","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045148","url":null,"abstract":"Long Term Evolution (LTE) networks are rapidly deploying around the world, covering the needs of high data rates demanded by many applications. Still, less attention is paid on the positioning capabilities specified in the LTE standard. Thus, an experimental LTE positioning receiver is presented to assess the positioning accuracy in commercial LTE deployments. This receiver is based on a software defined radio (SDR) and a low-cost radio-frequency (RF) front-end, such as the universal software radio peripheral (USRP) or a DVB-T dongle with the Realtek RTL2832U chipset. These two platforms are then used to capture and post-process real LTE signals generated in the laboratory. The positioning results obtained show the viability on the use of this experimental SDR LTE positioning receiver with low-cost hardware platforms for commercial LTE networks.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122329218","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045133
D. Margaria, E. Falletti, A. Bagnasco, F. Parizzi, Augusto Torchi
The paper presents a novel strategy capable to effectively mitigate possible false locks of the receiver tracking stage in case of multi-peak code correlation functions, as for example high-order Binary Offset Carrier (BOC) modulations, used in modern Global Navigation Satellite System signals (e.g. Galileo and modernized GPS). The proposed strategy represents an enhanced version of well-known "bump-jumping" approach and it differs from the other solutions at the state of the art. Simulation results are provided in order to demonstrate and validate the performance and the flexibility of the proposed strategy in three cases: BOC(1,1) (Galileo E1 Open Service), BOCc(15,2.5) (Galileo E1a-like) and BOCC(10,5) (Galileo E6a-like) modulated signals.
本文提出了一种新的策略，能够有效地减轻接收机跟踪阶段在多峰码相关函数的情况下可能出现的假锁，例如高阶二进制偏移载波(BOC)调制，用于现代全球导航卫星系统信号(例如伽利略和现代化GPS)。所提出的策略代表了著名的“颠簸跳跃”方法的增强版本，它不同于其他最先进的解决方案。为了在BOC(1,1) (Galileo E1 Open Service)、BOCc(15,2.5) (Galileo e1a类)和BOCc(10,5) (Galileo e6a类)调制信号三种情况下展示和验证所提出策略的性能和灵活性，给出了仿真结果。
{"title":"A new strategy to mitigate side-peak lock errors in tracking multi-peak code correlation functions","authors":"D. Margaria, E. Falletti, A. Bagnasco, F. Parizzi, Augusto Torchi","doi":"10.1109/NAVITEC.2014.7045133","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045133","url":null,"abstract":"The paper presents a novel strategy capable to effectively mitigate possible false locks of the receiver tracking stage in case of multi-peak code correlation functions, as for example high-order Binary Offset Carrier (BOC) modulations, used in modern Global Navigation Satellite System signals (e.g. Galileo and modernized GPS). The proposed strategy represents an enhanced version of well-known \"bump-jumping\" approach and it differs from the other solutions at the state of the art. Simulation results are provided in order to demonstrate and validate the performance and the flexibility of the proposed strategy in three cases: BOC(1,1) (Galileo E1 Open Service), BOCc(15,2.5) (Galileo E1a-like) and BOCC(10,5) (Galileo E6a-like) modulated signals.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133302225","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045150
E. Schafer, S. Irteza, A. Jager, B. Bieske, A. Richter, Muhammad Abdullah Khan, M. Sathyamurthy, Sebastian Kerkmann, Alexander Rolapp, E. Hennig, R. Sommer
We present a four-channel GNSS front-end IC for a compact interference- and jammer-robust multi-antenna sub-sampling receiver for Galileo El-B/C and GPS LI signals. The front end includes four coherent RF-to-IF signal paths with an intermediate frequency of 75.42 MHz, a common PLL frequency synthesizer, which generates the 1500-MHz local-oscillator signal, and an I2C interface for parameter adjustment. The front end exhibits a gain of 83 dB, a noise figure of 2.8 dB, and an input-referred 1-dB compression point of -73.5 dBm preventing the front end from saturation while jammed. A path-to-path isolation of at least 30 dB leads to a high spatial resolution. The power consumption is 231.7 mW and 255.7 mW with and without interferers, respectively.
{"title":"A four-channel GNSS front-end IC for a compact interference- and jamming-robust multi-antenna Galileo/GPS receiver","authors":"E. Schafer, S. Irteza, A. Jager, B. Bieske, A. Richter, Muhammad Abdullah Khan, M. Sathyamurthy, Sebastian Kerkmann, Alexander Rolapp, E. Hennig, R. Sommer","doi":"10.1109/NAVITEC.2014.7045150","DOIUrl":"https://doi.org/10.1109/NAVITEC.2014.7045150","url":null,"abstract":"We present a four-channel GNSS front-end IC for a compact interference- and jammer-robust multi-antenna sub-sampling receiver for Galileo El-B/C and GPS LI signals. The front end includes four coherent RF-to-IF signal paths with an intermediate frequency of 75.42 MHz, a common PLL frequency synthesizer, which generates the 1500-MHz local-oscillator signal, and an I2C interface for parameter adjustment. The front end exhibits a gain of 83 dB, a noise figure of 2.8 dB, and an input-referred 1-dB compression point of -73.5 dBm preventing the front end from saturation while jammed. A path-to-path isolation of at least 30 dB leads to a high spatial resolution. The power consumption is 231.7 mW and 255.7 mW with and without interferers, respectively.","PeriodicalId":254397,"journal":{"name":"2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114386132","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 : 2014-12-01DOI: 10.1109/NAVITEC.2014.7045144
A. Ahmed, R. Tiwari, H. Strangeways, S. Boussakta
The Global positioning system (GPS) uses long pseudorandom code sequences at L-band frequencies to provide navigation services to civilian and military users. However, in case of weak signals a long exhaustive search is required at the receiver for signal acquisition. A new acquisition method named Repetitive Block Acquisition (RBA) has been proposed to improve the detection performance and to speed up the acquisition process. The detection performance and computational complexity in terms FFT and IFFT operations of the proposed method is analyzed and is compared with the already existing Zero padding (ZP) and improved zero padding (IZP) methods. It is shown in this paper that the proposed acquisition method provide better detection performance when selecting long coherent lengths for signal acquisition by reducing the computational load of the receiver.
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