Pub Date : 2018-10-01DOI: 10.23919/RADIO.2018.8572375
F. Stoican, D. Popescu, L. Ichim
In this paper we consider a multi-obstacle environment in which ground terminal stations (GDTs) exchange information with unmanned aerial vehicles (UAVs) engaged in fulfilling a data gathering mission (i.e., a list of way-points defining sensor cluster heads is covered by the UAVs). We discuss limitations imposed by the terrain (obstacles), UAV dynamics and GDT characteristics and provide reference trajectories which ensure communication at all times. The associated optimization problem is put in a mixed integer form which guarantees the aforementioned constraints and minimizes the mission cost.
{"title":"A Geometrical Interpretation of Communication Restrictions in a Multi-Agent Environment","authors":"F. Stoican, D. Popescu, L. Ichim","doi":"10.23919/RADIO.2018.8572375","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572375","url":null,"abstract":"In this paper we consider a multi-obstacle environment in which ground terminal stations (GDTs) exchange information with unmanned aerial vehicles (UAVs) engaged in fulfilling a data gathering mission (i.e., a list of way-points defining sensor cluster heads is covered by the UAVs). We discuss limitations imposed by the terrain (obstacles), UAV dynamics and GDT characteristics and provide reference trajectories which ensure communication at all times. The associated optimization problem is put in a mixed integer form which guarantees the aforementioned constraints and minimizes the mission cost.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127040012","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572352
H. Filipescu, L. Dolga, C. Moldovan, F. Alexa, M. Frigura-Iliasa
This article will discuss about the improvement of a simple radio frequency (RF) front-end transceiver unit located into an embedded system taken from the automotive industry, as part of a remote keyless entry (RKE) car system. The main objective is to reduce its size and complexity as well as to reduce radiation. Some impedance tests on the existing and on the proposed model were also carried out.
{"title":"Computer Aided Design and Model of a Remote Keyless Module Antenna","authors":"H. Filipescu, L. Dolga, C. Moldovan, F. Alexa, M. Frigura-Iliasa","doi":"10.23919/RADIO.2018.8572352","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572352","url":null,"abstract":"This article will discuss about the improvement of a simple radio frequency (RF) front-end transceiver unit located into an embedded system taken from the automotive industry, as part of a remote keyless entry (RKE) car system. The main objective is to reduce its size and complexity as well as to reduce radiation. Some impedance tests on the existing and on the proposed model were also carried out.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"131 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126211029","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572346
A. Gevorkyan, Privalova T. Yu
In this paper it is shown that the use of radar absorbing material (RAM) allows to expand the working frequency band of the antenna by 330 MHz (6.3%). The antenna with RAM had a working frequency band by the level of $mathbf{VSWR}leq 3$ in the frequency range 2.29-7.85 GHz (3.43:1 bandwidth). The antenna without RAM had a working frequency band by level of $mathbf{VSWR}leq 3$ in the frequency range 2.30-7.53 GHz. The use of RAM allowed to increase the realized gain at the frequency of 7.85 GHz by 1.1 dB (from −11.2 to −10.2 dB).
本文表明，雷达吸波材料(RAM)的使用可以使天线的工作频带扩大330 MHz (6.3 MHz)%). The antenna with RAM had a working frequency band by the level of $mathbf{VSWR}leq 3$ in the frequency range 2.29-7.85 GHz (3.43:1 bandwidth). The antenna without RAM had a working frequency band by level of $mathbf{VSWR}leq 3$ in the frequency range 2.30-7.53 GHz. The use of RAM allowed to increase the realized gain at the frequency of 7.85 GHz by 1.1 dB (from −11.2 to −10.2 dB).
{"title":"The Radiation Characteristics of 3.43:1 Bandwidth Dipole Antenna with Radar Absorbing Material","authors":"A. Gevorkyan, Privalova T. Yu","doi":"10.23919/RADIO.2018.8572346","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572346","url":null,"abstract":"In this paper it is shown that the use of radar absorbing material (RAM) allows to expand the working frequency band of the antenna by 330 MHz (6.3%). The antenna with RAM had a working frequency band by the level of $mathbf{VSWR}leq 3$ in the frequency range 2.29-7.85 GHz (3.43:1 bandwidth). The antenna without RAM had a working frequency band by level of $mathbf{VSWR}leq 3$ in the frequency range 2.30-7.53 GHz. The use of RAM allowed to increase the realized gain at the frequency of 7.85 GHz by 1.1 dB (from −11.2 to −10.2 dB).","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116597294","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572387
D. Letavin, R. Abdullin
In this paper, using a program of electrodynamic analysis of the NI-AWR Design Environment 13, compact branch-line coupler were designed with different substrate thicknesses using electrodynamic structures. Based on the obtained results, the influence of the thickness of the material used on the effectiveness of miniaturization of coupler was analyzed. The process of reducing the geometric dimensions consists in replacing the quarter-wave segments by synthesized electrodynamic structures that have similar characteristics at the central frequency and in its vicinity. With the help of the AWR program, three designs of a branch-line coupler with a thickness of 1, and 1.5 mm have been analyzed and, from the data obtained, it can be concluded that the smaller the thickness of the substrate, the higher the efficiency of miniaturization of the coupler.
{"title":"Development of Compact Coupler Devices on Electrody-Namic Structures with Different Thickness Substrates","authors":"D. Letavin, R. Abdullin","doi":"10.23919/RADIO.2018.8572387","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572387","url":null,"abstract":"In this paper, using a program of electrodynamic analysis of the NI-AWR Design Environment 13, compact branch-line coupler were designed with different substrate thicknesses using electrodynamic structures. Based on the obtained results, the influence of the thickness of the material used on the effectiveness of miniaturization of coupler was analyzed. The process of reducing the geometric dimensions consists in replacing the quarter-wave segments by synthesized electrodynamic structures that have similar characteristics at the central frequency and in its vicinity. With the help of the AWR program, three designs of a branch-line coupler with a thickness of 1, and 1.5 mm have been analyzed and, from the data obtained, it can be concluded that the smaller the thickness of the substrate, the higher the efficiency of miniaturization of the coupler.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116762295","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572461
Pierre Gogendeau, N. Murad, S. Bernard, V. Kerzérho, Laurent Deknyff, S. Bonhommeau
This paper describes an experiment in an open sea environment and analyses the different configurations of the LoRa model (spreading factor, bandwidth, coding rate) for oversea signals. We determine a channel model and find the transceiver locations as a function of the received signal power. We show two locations can be differentiated with a 100 m error at 1.6 km maximal distance. We prove there is no significant differences between all possible configurations in terms of accuracy. Thus, we select the fastest configuration in order to increase the database measurement.
{"title":"Oversea Radio Measurements and Channel Characterization with LoRa Technology","authors":"Pierre Gogendeau, N. Murad, S. Bernard, V. Kerzérho, Laurent Deknyff, S. Bonhommeau","doi":"10.23919/RADIO.2018.8572461","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572461","url":null,"abstract":"This paper describes an experiment in an open sea environment and analyses the different configurations of the LoRa model (spreading factor, bandwidth, coding rate) for oversea signals. We determine a channel model and find the transceiver locations as a function of the received signal power. We show two locations can be differentiated with a 100 m error at 1.6 km maximal distance. We prove there is no significant differences between all possible configurations in terms of accuracy. Thus, we select the fastest configuration in order to increase the database measurement.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"35 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123532571","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572448
S. Bulja, P. Rulikowski
In this paper a variable high dynamic range Reflection-Type Attenuator (RTA) is presented. The proposed RTA consists of a 3-dB coupler and two PIN diodes per reflective load. The PIN diodes are connected to the 3-dB coupler through a network comprising impedance transformers. The exact values of the impedance transformers needed for a high dynamic range are set in accordance with the developed theory. As an experimental verification, two RTAs have been fabricated - one with a single PIN diode per load and one with the proposed two PIN diodes per load. It is shown that the proposed RTA consisting of two PIN diodes per load offers a dynamic range that is two times greater than its single PIN diode counterpart, without a noteworthy increase in the insertion losses.
{"title":"High Dynamic Range Reflection-Type Attenuator","authors":"S. Bulja, P. Rulikowski","doi":"10.23919/RADIO.2018.8572448","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572448","url":null,"abstract":"In this paper a variable high dynamic range Reflection-Type Attenuator (RTA) is presented. The proposed RTA consists of a 3-dB coupler and two PIN diodes per reflective load. The PIN diodes are connected to the 3-dB coupler through a network comprising impedance transformers. The exact values of the impedance transformers needed for a high dynamic range are set in accordance with the developed theory. As an experimental verification, two RTAs have been fabricated - one with a single PIN diode per load and one with the proposed two PIN diodes per load. It is shown that the proposed RTA consisting of two PIN diodes per load offers a dynamic range that is two times greater than its single PIN diode counterpart, without a noteworthy increase in the insertion losses.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127522357","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572336
P. Gomez-del-Hoyo, N. del-Rey-Maestre, D. Mata-Moya, M. Jarabo-Amores, M. Benito-Ortiz
This work tackles terrestrial targets monitoring using a Passive Radar System (PRS) characterized by a surveillance channel processing composed of a Neyman-Pearson (NP) detector and three-dimensional tracker implementation. The NP detector is a parametric approach that requires the prior knowledge of target and bistatic clutter statistical models at communication systems frequencies that fit with real data. The proposed tracker provides three-dimensional (range, azimuth and speed) trajectories declaration exploiting the capabilities of beamforming techniques based on a uniform linear array as surveillance antenna system. The considered solution is validated with real data acquired by a PRS in a semi-urban scenario.
{"title":"Terrestrial Targets Tracking with Passive Radar System Using Neyman-Pearson Detector","authors":"P. Gomez-del-Hoyo, N. del-Rey-Maestre, D. Mata-Moya, M. Jarabo-Amores, M. Benito-Ortiz","doi":"10.23919/RADIO.2018.8572336","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572336","url":null,"abstract":"This work tackles terrestrial targets monitoring using a Passive Radar System (PRS) characterized by a surveillance channel processing composed of a Neyman-Pearson (NP) detector and three-dimensional tracker implementation. The NP detector is a parametric approach that requires the prior knowledge of target and bistatic clutter statistical models at communication systems frequencies that fit with real data. The proposed tracker provides three-dimensional (range, azimuth and speed) trajectories declaration exploiting the capabilities of beamforming techniques based on a uniform linear array as surveillance antenna system. The considered solution is validated with real data acquired by a PRS in a semi-urban scenario.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128485744","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572376
F. Challita, P. Laly, M. Liénard, D. Gaillot, J. Molina-García-Pardo, W. Joseph
Polarimetric characteristics of the propagation channel in a straight tunnel and in a frequency band around 1.3 GHz, are deduced from measurements using a real-time MIMO channel sounder. Emphasis is on the cross-polarization discrimination factor and, for a MIMO configuration, on the correlation between transmitting and receiving array elements, depending on the array orientation and on the polarization of the transmitting elements.
{"title":"MIMO in Tunnel: Impact of Polarization and Array Orientation on the Channel Characteristics","authors":"F. Challita, P. Laly, M. Liénard, D. Gaillot, J. Molina-García-Pardo, W. Joseph","doi":"10.23919/RADIO.2018.8572376","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572376","url":null,"abstract":"Polarimetric characteristics of the propagation channel in a straight tunnel and in a frequency band around 1.3 GHz, are deduced from measurements using a real-time MIMO channel sounder. Emphasis is on the cross-polarization discrimination factor and, for a MIMO configuration, on the correlation between transmitting and receiving array elements, depending on the array orientation and on the polarization of the transmitting elements.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127695400","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 : 2018-10-01DOI: 10.23919/radio.2018.8572458
{"title":"[Title page]","authors":"","doi":"10.23919/radio.2018.8572458","DOIUrl":"https://doi.org/10.23919/radio.2018.8572458","url":null,"abstract":"","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116734966","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 : 2018-10-01DOI: 10.23919/RADIO.2018.8572328
D. Davidson, A. Sutinjo, R. Wayth, D. Ung, D. D. de Villiers, J. Gilmore, J. G. Bij de Vaate, Rene Baelemans, A. B. Smolders
Design considerations and contemporary methods for analyzing and designing aperture arrays for radio astronomy are reviewed, with reference to the SKA. The use of computational electromagnetic tools to evaluate array performance, including embedded element patterns is addressed, as well as an approximation which includes some effects of mutual coupling. The subsequent inclusion of network models of the RF front-ends and including the beamformer are also considered. The analysis of receiving systems is specifically discussed.
{"title":"Recent Progress on the Design of Aperture Arrays for Radio Astronomy","authors":"D. Davidson, A. Sutinjo, R. Wayth, D. Ung, D. D. de Villiers, J. Gilmore, J. G. Bij de Vaate, Rene Baelemans, A. B. Smolders","doi":"10.23919/RADIO.2018.8572328","DOIUrl":"https://doi.org/10.23919/RADIO.2018.8572328","url":null,"abstract":"Design considerations and contemporary methods for analyzing and designing aperture arrays for radio astronomy are reviewed, with reference to the SKA. The use of computational electromagnetic tools to evaluate array performance, including embedded element patterns is addressed, as well as an approximation which includes some effects of mutual coupling. The subsequent inclusion of network models of the RF front-ends and including the beamformer are also considered. The analysis of receiving systems is specifically discussed.","PeriodicalId":365518,"journal":{"name":"2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116560999","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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