Pub Date : 2015-09-01DOI: 10.1109/EURAD.2015.7346336
H. Kubo, Tsunayuki Yamamoto, Masayuki Takamatsu, A. Sanada
A waveguide-type leaky wave antenna with periodical slots is proposed. The beam can be scanned at a single frequency by switching diodes connected to the slots. A combination of the slots is excited selectively so as to make a beam to a desired direction. By changing the combination the beam can be scanned discretely from 60 deg. to 120 deg. Measured radiation patterns agree with theoretical predictions. The diode loss is comparatively small.
{"title":"Waveguide-type discrete beam-scan antenna with switching diodes","authors":"H. Kubo, Tsunayuki Yamamoto, Masayuki Takamatsu, A. Sanada","doi":"10.1109/EURAD.2015.7346336","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346336","url":null,"abstract":"A waveguide-type leaky wave antenna with periodical slots is proposed. The beam can be scanned at a single frequency by switching diodes connected to the slots. A combination of the slots is excited selectively so as to make a beam to a desired direction. By changing the combination the beam can be scanned discretely from 60 deg. to 120 deg. Measured radiation patterns agree with theoretical predictions. The diode loss is comparatively small.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130398561","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 : 2015-09-01DOI: 10.1109/EUMC.2015.7346066
T. Otsuyama, J. Honda, K. Shiomi, G. Minorikawa, Yusuke Hamanaka
Situational awareness is an essential factor for flight safety and efficiency. The current Air Traffic Management (ATM) uses various radio equipment. Today, many aircraft have a capability called ADS-B (Automatic Dependent Surveillance - Broadcast). They determine a position via satellite navigation and periodically broadcast their flight information. ADS-B equipment have a high cost of installation, maintenance and operation. For this reason, in Japan, the ADS-B system is installed in a small number of aircraft for general aviation and small aircraft such as motor gliders. However, there were requests for a simple surveillance system without special equipment such as ADS-B for aircraft operation. In this paper, we described the performance evaluation of PSSR (Passive Secondary Surveillance Radar) system by flight experiments using motor gliders. And we discussed the potentials of the PSSR.
{"title":"Performance evaluation of Passive Secondary Surveillance Radar for small aircraft surveillance","authors":"T. Otsuyama, J. Honda, K. Shiomi, G. Minorikawa, Yusuke Hamanaka","doi":"10.1109/EUMC.2015.7346066","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7346066","url":null,"abstract":"Situational awareness is an essential factor for flight safety and efficiency. The current Air Traffic Management (ATM) uses various radio equipment. Today, many aircraft have a capability called ADS-B (Automatic Dependent Surveillance - Broadcast). They determine a position via satellite navigation and periodically broadcast their flight information. ADS-B equipment have a high cost of installation, maintenance and operation. For this reason, in Japan, the ADS-B system is installed in a small number of aircraft for general aviation and small aircraft such as motor gliders. However, there were requests for a simple surveillance system without special equipment such as ADS-B for aircraft operation. In this paper, we described the performance evaluation of PSSR (Passive Secondary Surveillance Radar) system by flight experiments using motor gliders. And we discussed the potentials of the PSSR.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"226 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122044697","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 : 2015-09-01DOI: 10.1109/EURAD.2015.7346318
A. Munir, Jumail Soba
In this paper, an approach to implement an array of split ring resonators (SRR) as a part of antenna structure is presented for exciting multiband property of a single-band microstrip patch antenna. The proposed antenna is intended to satisfy the demand of compact device with unique features for wireless communication systems. The antenna is designed on FR4 Epoxy dielectric substrates with the dimension of 78.6mm × 48.4mm and total thickness of 1.6mm. To demonstrate the multiband property, a conventional microstrip patch antenna is simultaneously designed on the same dielectric substrate and physical parameters to be compared with the proposed antenna. From the experimental characterization, it shows that the proposed antenna has 3 resonant frequencies in the range of 1-3GHz. The first resonant frequency is 1.47GHz with working bandwidth of 336MHz which is comparable to the design one with resonant frequency of 1.55GHz and working bandwidth of 330MHz. Whilst the second and third resonant frequencies are 2.43GHz with working bandwidth of 61MHz and 2.86GHz with working bandwidth of 179MHz, respectively.
{"title":"Multiband printed antenna composed of an array of split ring resonators","authors":"A. Munir, Jumail Soba","doi":"10.1109/EURAD.2015.7346318","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346318","url":null,"abstract":"In this paper, an approach to implement an array of split ring resonators (SRR) as a part of antenna structure is presented for exciting multiband property of a single-band microstrip patch antenna. The proposed antenna is intended to satisfy the demand of compact device with unique features for wireless communication systems. The antenna is designed on FR4 Epoxy dielectric substrates with the dimension of 78.6mm × 48.4mm and total thickness of 1.6mm. To demonstrate the multiband property, a conventional microstrip patch antenna is simultaneously designed on the same dielectric substrate and physical parameters to be compared with the proposed antenna. From the experimental characterization, it shows that the proposed antenna has 3 resonant frequencies in the range of 1-3GHz. The first resonant frequency is 1.47GHz with working bandwidth of 336MHz which is comparable to the design one with resonant frequency of 1.55GHz and working bandwidth of 330MHz. Whilst the second and third resonant frequencies are 2.43GHz with working bandwidth of 61MHz and 2.86GHz with working bandwidth of 179MHz, respectively.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116479583","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 : 2015-09-01DOI: 10.1109/EUMC.2015.7346046
J. Pourahmadazar, T. Denidni
This paper presents a 10 GHz substrate integrated waveguide (SIW) multi-beam tapered slot antenna (TSA) array using beam switching techniques for the first time. This structure is consists of Rotman lens, phase shift network and linear array of radiating elements. Both Rotman lens and radiating parts are connected through unequal wide SIW phase shifter network. A prototype lens is designed with 7 beam ports and 9 array ports. Unlike conventional Rotman lens Vivaldi multi-beam antennas; the proposed design only represents a planar structure operating at 8 to 12 GHz with scanning capability over (-24°,+24°).
{"title":"Multi-beam tapered slot antenna array using substrate integrated waveguide Rotman lens","authors":"J. Pourahmadazar, T. Denidni","doi":"10.1109/EUMC.2015.7346046","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7346046","url":null,"abstract":"This paper presents a 10 GHz substrate integrated waveguide (SIW) multi-beam tapered slot antenna (TSA) array using beam switching techniques for the first time. This structure is consists of Rotman lens, phase shift network and linear array of radiating elements. Both Rotman lens and radiating parts are connected through unequal wide SIW phase shifter network. A prototype lens is designed with 7 beam ports and 9 array ports. Unlike conventional Rotman lens Vivaldi multi-beam antennas; the proposed design only represents a planar structure operating at 8 to 12 GHz with scanning capability over (-24°,+24°).","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124154245","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 : 2015-09-01DOI: 10.1109/EURAD.2015.7346323
Fatemeh Akbar, A. Mortazawi
A simplified architecture for a scalable phased array is proposed. In this design, a new technique for steering the array's beam has been devised. The proposed technique integrates the phase shift function into array's feed network and significantly reduces the required number of phase shifters in phased array. Phase shifters are responsible for a great portion of the complexity, size, and cost of phased arrays. Therefore, reducing their number allows for less complexity and cost. As a proof of concept, a Ku-band eight element phased array based on the proposed method is presented. This array has 33 degrees of scan range and is composed of variable gain amplifiers, power combiners/dividers, and two phase shifters.
{"title":"Design of a scalable phased array antenna with a simplified architecture","authors":"Fatemeh Akbar, A. Mortazawi","doi":"10.1109/EURAD.2015.7346323","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346323","url":null,"abstract":"A simplified architecture for a scalable phased array is proposed. In this design, a new technique for steering the array's beam has been devised. The proposed technique integrates the phase shift function into array's feed network and significantly reduces the required number of phase shifters in phased array. Phase shifters are responsible for a great portion of the complexity, size, and cost of phased arrays. Therefore, reducing their number allows for less complexity and cost. As a proof of concept, a Ku-band eight element phased array based on the proposed method is presented. This array has 33 degrees of scan range and is composed of variable gain amplifiers, power combiners/dividers, and two phase shifters.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114305546","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 : 2015-09-01DOI: 10.1109/EURAD.2015.7346261
Francisco León-Infante, José-Tomás González-Partida, R. Blázquez-García, M. Burgos-García
The use of heavy machinery is one of the main causes of accidents in sites as warehouses or construction. These vehicles have several blind spots that encumber their maneuvering and create a collision-prone environment. To ensure safety in these situations, an early warning system capable of avoiding these accidents is required. An innovative solution consists of the use of a on-board, low-cost, K-band radar network. The complete system is to operate with a very low false alarm rate (FAR) to avoid unnecessary stops and loss of trust by the driver. In order to fulfill this requirement, a processing chain that rejects false detections is implemented. It is also responsible for joining data from all the subsystems of the network.
{"title":"Processing chain of a radar network for safety improvement in the usage of heavy machinery","authors":"Francisco León-Infante, José-Tomás González-Partida, R. Blázquez-García, M. Burgos-García","doi":"10.1109/EURAD.2015.7346261","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346261","url":null,"abstract":"The use of heavy machinery is one of the main causes of accidents in sites as warehouses or construction. These vehicles have several blind spots that encumber their maneuvering and create a collision-prone environment. To ensure safety in these situations, an early warning system capable of avoiding these accidents is required. An innovative solution consists of the use of a on-board, low-cost, K-band radar network. The complete system is to operate with a very low false alarm rate (FAR) to avoid unnecessary stops and loss of trust by the driver. In order to fulfill this requirement, a processing chain that rejects false detections is implemented. It is also responsible for joining data from all the subsystems of the network.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128202997","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 : 2015-09-01DOI: 10.1109/EUMC.2015.7346070
M. Ahmad, M. Amin, A. Khan, M. Azim, M. A. Alim
In this research paper, circular polarization of Quadrifilar Helix Antenna (QHA) is investigated under the effects of large fixed metallic ground plane. Variations in the height of QHA above the ground plane affect the circular polarization of QHA. It is noted that boresight axial ratio and 3dB axial ratio beamwidth of QHA fluctuate as height of the QHA ascends above the reference ground plane. Deployment of QHA between the heights of 0.57 λ to 0.7 λ generates 3dB axial ratio beamwidth that is broader than 100°. Input characteristics of QHA are also investigated for varying sized finite ground planes. Excellent circular polarization and wide 3dB axial ratio beamwidth support deployment of QHA on decks of Low Earth Orbit (LEO) satellite for reliable communication.
{"title":"Analysis of circular polarization of the Quadrifilar Helix Antenna in the presence of ground plane for LEO satellites","authors":"M. Ahmad, M. Amin, A. Khan, M. Azim, M. A. Alim","doi":"10.1109/EUMC.2015.7346070","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7346070","url":null,"abstract":"In this research paper, circular polarization of Quadrifilar Helix Antenna (QHA) is investigated under the effects of large fixed metallic ground plane. Variations in the height of QHA above the ground plane affect the circular polarization of QHA. It is noted that boresight axial ratio and 3dB axial ratio beamwidth of QHA fluctuate as height of the QHA ascends above the reference ground plane. Deployment of QHA between the heights of 0.57 λ to 0.7 λ generates 3dB axial ratio beamwidth that is broader than 100°. Input characteristics of QHA are also investigated for varying sized finite ground planes. Excellent circular polarization and wide 3dB axial ratio beamwidth support deployment of QHA on decks of Low Earth Orbit (LEO) satellite for reliable communication.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126724655","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 : 2015-09-01DOI: 10.1109/EURAD.2015.7346253
K. Lukin, P. Vyplavin, V. Palamarchuk, S. Lukin, P. Sushenko, N. Zaets
We describe Ka-band MIMO Noise Radar and present preliminary results of its experimental validation using bistatic ground based SAR. The range resolution in radar 3D imaging is determined by power spectrum width of the transmitted signal, while its cross-range resolutions are defined by 2D aperture dimensions. We apply MIMO concept with time-division to emulate 2D aperture synthesis combined with range resolution due to wideband random signals which enables generation of 3D coherent radar images. Two antennas with aperture synthesizing have been used as virtual transmit and receive antenna arrays oriented in vertical and horizontal directions, respectively.
{"title":"MIMO Noise Radar with signals time-division in receive channels","authors":"K. Lukin, P. Vyplavin, V. Palamarchuk, S. Lukin, P. Sushenko, N. Zaets","doi":"10.1109/EURAD.2015.7346253","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346253","url":null,"abstract":"We describe Ka-band MIMO Noise Radar and present preliminary results of its experimental validation using bistatic ground based SAR. The range resolution in radar 3D imaging is determined by power spectrum width of the transmitted signal, while its cross-range resolutions are defined by 2D aperture dimensions. We apply MIMO concept with time-division to emulate 2D aperture synthesis combined with range resolution due to wideband random signals which enables generation of 3D coherent radar images. Two antennas with aperture synthesizing have been used as virtual transmit and receive antenna arrays oriented in vertical and horizontal directions, respectively.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129347623","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 : 2015-09-01DOI: 10.1109/EURAD.2015.7346362
M. A. Selver, E. Y. Zoral, M. Seçmen
The classification of similar shaped objects from scattered electromagnetic waves is a difficult problem, as it heavily depends on the aspect angle. The reduction of the adverse effects of the aspect angle is possible by extracting distinguishable features from the scattered signals. In this paper, we propose a target identification method in resonance scattering region using a novel structural feature set based on scattered signal waveform. The feature set carries out a triangularization process to model the hills and valleys of the scattered signal. Once these subwaveforms are identified, their peaks, widths, increase and decrease rates are calculated for each of them. Together with the inter-distance between the sub-waves, feature vector is constructed. Then, cross validation strategies are used to design a classifier using multi-layer perceptron network. The simulations performed by two different target libraries; dielectric rods with different permittivity and small scale aircraft models show very high accuracy of the proposed system in real time.
{"title":"Real time classification of targets using waveforms in resonance scattering region","authors":"M. A. Selver, E. Y. Zoral, M. Seçmen","doi":"10.1109/EURAD.2015.7346362","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346362","url":null,"abstract":"The classification of similar shaped objects from scattered electromagnetic waves is a difficult problem, as it heavily depends on the aspect angle. The reduction of the adverse effects of the aspect angle is possible by extracting distinguishable features from the scattered signals. In this paper, we propose a target identification method in resonance scattering region using a novel structural feature set based on scattered signal waveform. The feature set carries out a triangularization process to model the hills and valleys of the scattered signal. Once these subwaveforms are identified, their peaks, widths, increase and decrease rates are calculated for each of them. Together with the inter-distance between the sub-waves, feature vector is constructed. Then, cross validation strategies are used to design a classifier using multi-layer perceptron network. The simulations performed by two different target libraries; dielectric rods with different permittivity and small scale aircraft models show very high accuracy of the proposed system in real time.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115264145","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 : 2015-09-01DOI: 10.1109/EURAD.2015.7346358
Dawei Song, S. Shang, Xi Luo
The high-accuracy retrieval of sea remote sensing information, such as wind field, wave height and Permittivity, is determined by the microwave scattering model at the sea surface. Thus it is meaningful to study the accurate microwave scattering characteristic of rough sea surface. Based on the current Two-Scale model, this paper modifies the model of microwave scattering from three aspects:the correction of Non-linear anisotropic sea spectrum, the correction of the joint probability density of the Non-linear anisotropic sea-surface slope and the correction of shadowing effect. It is shown by simulation that the data obtained from corrected Two-Scale model is much closer to the real experimental data than from the conventional Two-Scale model.
{"title":"The study of microwave scattering of anisotropic sea surface with the corrected Two-Scale model","authors":"Dawei Song, S. Shang, Xi Luo","doi":"10.1109/EURAD.2015.7346358","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346358","url":null,"abstract":"The high-accuracy retrieval of sea remote sensing information, such as wind field, wave height and Permittivity, is determined by the microwave scattering model at the sea surface. Thus it is meaningful to study the accurate microwave scattering characteristic of rough sea surface. Based on the current Two-Scale model, this paper modifies the model of microwave scattering from three aspects:the correction of Non-linear anisotropic sea spectrum, the correction of the joint probability density of the Non-linear anisotropic sea-surface slope and the correction of shadowing effect. It is shown by simulation that the data obtained from corrected Two-Scale model is much closer to the real experimental data than from the conventional Two-Scale model.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114520778","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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