Pub Date : 2017-10-01DOI: 10.1109/WPNC.2017.8250060
S. A. Almasri, N. Doose, P. Hoeher
A parametric direction-of-arrival (DoA) estimation technique is investigated for an advanced multi-mode antenna design. It is proven that multi-mode antennas are suitable for this purpose. Possible applications include swarm exploration and indoor positioning.
{"title":"Parametric direction-of-arrival estimation for multi-mode antennas","authors":"S. A. Almasri, N. Doose, P. Hoeher","doi":"10.1109/WPNC.2017.8250060","DOIUrl":"https://doi.org/10.1109/WPNC.2017.8250060","url":null,"abstract":"A parametric direction-of-arrival (DoA) estimation technique is investigated for an advanced multi-mode antenna design. It is proven that multi-mode antennas are suitable for this purpose. Possible applications include swarm exploration and indoor positioning.","PeriodicalId":246107,"journal":{"name":"2017 14th Workshop on Positioning, Navigation and Communications (WPNC)","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130661692","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 : 2017-10-01DOI: 10.1109/WPNC.2017.8250054
B. Denis, Cristian Pana, G. Abreu
In this paper, we evaluate the potential of several compressed sensing (CS) techniques for localizing mobile targets within a wireless sensor network. First, we point out the limitations of popular algorithms enabling greedy s-sparse signal recovery, such as the recursive least-absolute shrinkage and selection operator (RLASSO) or the simultaneous orthogonal matching pursuit (SOMP). Then, we adapt the previous methods, making use of their non-binary outputs as soft information while accounting for the presence of a mobile target over a 2D grid. We also reformulate the localization problem by considering separable coordinate-wise CS dictionaries and accordingly, we introduce a new iterative gradient descent based solver relying on alternate coordinates projections (IACP). In comparison with conventional approaches, the latter CS solution benefits from arbitrarily fine spatial granularity at very low computational complexity. Finally, we show how successive restrictions of the search area under mobility can contribute to achieve even better localization performance and lower complexity for two of the proposed CS algorithms.
{"title":"Mobile target localization through low complexity compressed sensing with iterative alternate coordinates projections","authors":"B. Denis, Cristian Pana, G. Abreu","doi":"10.1109/WPNC.2017.8250054","DOIUrl":"https://doi.org/10.1109/WPNC.2017.8250054","url":null,"abstract":"In this paper, we evaluate the potential of several compressed sensing (CS) techniques for localizing mobile targets within a wireless sensor network. First, we point out the limitations of popular algorithms enabling greedy s-sparse signal recovery, such as the recursive least-absolute shrinkage and selection operator (RLASSO) or the simultaneous orthogonal matching pursuit (SOMP). Then, we adapt the previous methods, making use of their non-binary outputs as soft information while accounting for the presence of a mobile target over a 2D grid. We also reformulate the localization problem by considering separable coordinate-wise CS dictionaries and accordingly, we introduce a new iterative gradient descent based solver relying on alternate coordinates projections (IACP). In comparison with conventional approaches, the latter CS solution benefits from arbitrarily fine spatial granularity at very low computational complexity. Finally, we show how successive restrictions of the search area under mobility can contribute to achieve even better localization performance and lower complexity for two of the proposed CS algorithms.","PeriodicalId":246107,"journal":{"name":"2017 14th Workshop on Positioning, Navigation and Communications (WPNC)","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130880776","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 : 2017-10-01DOI: 10.1109/WPNC.2017.8250067
Gabriel Ortiz, Fredrik Treven, L. Svensson, P. Larsson-Edefors, Sebastian Johansson-Mauricio
The growing number of applications in automated robots and vehicles has increased the demand for positioning, locating, and tracking systems. The majority of the current methods are based on machine vision systems and require a continuous direct line of sight (LOS) between the tracking device and the target for carrying out the desired functionalities. This limits the possible applications and makes them vulnerable to disturbances. The method presented in this paper aims to remove the continuous LOS requirement and allow for an omnidirectional and accurate tracking method using ultra-wideband (UWB) technology. This is achieved by placing a set of anchors within a short distance of one another on a device capable of movement that can keep track of the position of a target; this is in contrast to regular indoor positioning systems where a target monitors its own position in relation to a set of fixed reference anchors placed at a large distance apart. The new approach is referred to as the flipped anchors topology. The results show that the proposed topology is suitable for positioning, tracking and following applications that require a high degree of accuracy at short distances with the possibility of removing the continuous direct LOS requirement.
{"title":"A framework for a relative real-time tracking system based on ultra-wideband technology","authors":"Gabriel Ortiz, Fredrik Treven, L. Svensson, P. Larsson-Edefors, Sebastian Johansson-Mauricio","doi":"10.1109/WPNC.2017.8250067","DOIUrl":"https://doi.org/10.1109/WPNC.2017.8250067","url":null,"abstract":"The growing number of applications in automated robots and vehicles has increased the demand for positioning, locating, and tracking systems. The majority of the current methods are based on machine vision systems and require a continuous direct line of sight (LOS) between the tracking device and the target for carrying out the desired functionalities. This limits the possible applications and makes them vulnerable to disturbances. The method presented in this paper aims to remove the continuous LOS requirement and allow for an omnidirectional and accurate tracking method using ultra-wideband (UWB) technology. This is achieved by placing a set of anchors within a short distance of one another on a device capable of movement that can keep track of the position of a target; this is in contrast to regular indoor positioning systems where a target monitors its own position in relation to a set of fixed reference anchors placed at a large distance apart. The new approach is referred to as the flipped anchors topology. The results show that the proposed topology is suitable for positioning, tracking and following applications that require a high degree of accuracy at short distances with the possibility of removing the continuous direct LOS requirement.","PeriodicalId":246107,"journal":{"name":"2017 14th Workshop on Positioning, Navigation and Communications (WPNC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132644532","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 : 2017-10-01DOI: 10.1109/WPNC.2017.8250074
N. Fernandez, S. Schön
Collaborative Positioning (CP) describes a technique in which a group of dynamic nodes (pedestrians, vehicles, etc.) equipped with different sensors can increase their precision of the Positioning Navigation and Timing (PNT) information by exchanging navigation information as well as performing measurements between nodes or to elements of the environment. In addition, the elements of the environment (landmarks, buildings, etc.) are also considered in the network as a set of fixed nodes with known or only partially known coordinates. Hence, the navigation system can be considered as a geodetic network in which some of the nodes are changing their position. In this paper, we will discuss the implementation of a simulation tool to evaluate the benefits of collaborative positioning. The fact that several multi-sensor systems are included in the navigation situation, brings the necessity of a sensor measurement fusion algorithm for the parameter estimation of the different nodes. Here, we implement a batch algorithm that enables an easy study of correlations and dependencies between different parameters as well as the identification of critical observations in the sensor network for the overall performance. The current status of implementation is discussed and illustrated with a typical 2D car navigation scenario.
{"title":"Development of a simulation tool for collaborative navigation systems","authors":"N. Fernandez, S. Schön","doi":"10.1109/WPNC.2017.8250074","DOIUrl":"https://doi.org/10.1109/WPNC.2017.8250074","url":null,"abstract":"Collaborative Positioning (CP) describes a technique in which a group of dynamic nodes (pedestrians, vehicles, etc.) equipped with different sensors can increase their precision of the Positioning Navigation and Timing (PNT) information by exchanging navigation information as well as performing measurements between nodes or to elements of the environment. In addition, the elements of the environment (landmarks, buildings, etc.) are also considered in the network as a set of fixed nodes with known or only partially known coordinates. Hence, the navigation system can be considered as a geodetic network in which some of the nodes are changing their position. In this paper, we will discuss the implementation of a simulation tool to evaluate the benefits of collaborative positioning. The fact that several multi-sensor systems are included in the navigation situation, brings the necessity of a sensor measurement fusion algorithm for the parameter estimation of the different nodes. Here, we implement a batch algorithm that enables an easy study of correlations and dependencies between different parameters as well as the identification of critical observations in the sensor network for the overall performance. The current status of implementation is discussed and illustrated with a typical 2D car navigation scenario.","PeriodicalId":246107,"journal":{"name":"2017 14th Workshop on Positioning, Navigation and Communications (WPNC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114360713","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 : 2017-10-01DOI: 10.1109/WPNC.2017.8250047
I. Hashish, G. Motta, M. Meazza, Guoqing Bu, Kaixu Liu, L. Duico, A. Longo
Indoor Navigation Services (INS), a branch of Location Based Services (LBS), are aiming at locating people inside a building and guiding them to their destinations by using various techniques, either individually or fused. INSs deal with the peculiarities of indoor environments (no GPS, navigation XYZ, etc.). This paper, based on a previous research, sketches an ideal profile of an INS, which should be as independent as possible from a pre-deployed infrastructure. We also present a use-case, i.e. a navigation in a big university library; such app, called NavApp, guides users in locating the books in the library shelves for picking or storing, by using Magnetic Fields, and fusing installed sensors, when available. NavApp covers the whole mobility lifecycle, namely mapping and positioning using, path planning, en-route assistance; its field-tests show an 86% success. Hence, NavApp looks attractive, because it is lightweight and does not require a pre-deployed infrastructure. However, it needs preparation phase, to create the map of magnetic fields and calibrate smartphones.
{"title":"NavApp: An indoor navigation application: A smartphone application for libraries","authors":"I. Hashish, G. Motta, M. Meazza, Guoqing Bu, Kaixu Liu, L. Duico, A. Longo","doi":"10.1109/WPNC.2017.8250047","DOIUrl":"https://doi.org/10.1109/WPNC.2017.8250047","url":null,"abstract":"Indoor Navigation Services (INS), a branch of Location Based Services (LBS), are aiming at locating people inside a building and guiding them to their destinations by using various techniques, either individually or fused. INSs deal with the peculiarities of indoor environments (no GPS, navigation XYZ, etc.). This paper, based on a previous research, sketches an ideal profile of an INS, which should be as independent as possible from a pre-deployed infrastructure. We also present a use-case, i.e. a navigation in a big university library; such app, called NavApp, guides users in locating the books in the library shelves for picking or storing, by using Magnetic Fields, and fusing installed sensors, when available. NavApp covers the whole mobility lifecycle, namely mapping and positioning using, path planning, en-route assistance; its field-tests show an 86% success. Hence, NavApp looks attractive, because it is lightweight and does not require a pre-deployed infrastructure. However, it needs preparation phase, to create the map of magnetic fields and calibrate smartphones.","PeriodicalId":246107,"journal":{"name":"2017 14th Workshop on Positioning, Navigation and Communications (WPNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129025505","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 : 2017-06-29DOI: 10.1109/WPNC.2017.8250056
R. Pöhlmann, Siwei Zhang, T. Jost, A. Dammann
Phased antenna arrays are widely used for direction- of-arrival (DoA) estimation. For low-cost applications, signal power or received signal strength indicator (RSSI) based approaches can be an alternative. However, they usually require multiple antennas, a single antenna that can be rotated, or switch- able antenna beams. In this paper we show how a multi-mode antenna (MMA) can be used for power-based DoA estimation. Only a single MMA is needed and neither rotation nor switching of antenna beams is required. We derive an estimation scheme as well as theoretical bounds and validate them through simulations. It is found that power-based DoA estimation with an MMA is feasible and accurate.
{"title":"Power-based direction-of-arrival estimation using a single multi-mode antenna","authors":"R. Pöhlmann, Siwei Zhang, T. Jost, A. Dammann","doi":"10.1109/WPNC.2017.8250056","DOIUrl":"https://doi.org/10.1109/WPNC.2017.8250056","url":null,"abstract":"Phased antenna arrays are widely used for direction- of-arrival (DoA) estimation. For low-cost applications, signal power or received signal strength indicator (RSSI) based approaches can be an alternative. However, they usually require multiple antennas, a single antenna that can be rotated, or switch- able antenna beams. In this paper we show how a multi-mode antenna (MMA) can be used for power-based DoA estimation. Only a single MMA is needed and neither rotation nor switching of antenna beams is required. We derive an estimation scheme as well as theoretical bounds and validate them through simulations. It is found that power-based DoA estimation with an MMA is feasible and accurate.","PeriodicalId":246107,"journal":{"name":"2017 14th Workshop on Positioning, Navigation and Communications (WPNC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122335211","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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