Pub Date : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105295
Xiaolan Wang, Qingtao Wan, T. Maruyama, G. Ma, Jinghua Li, Jiangtao Fan
Comparison of the global Total Electron Content (TEC) derived from dual-frequency Global Positioning System (GPS) data and International Reference Ionosphere (IRI) used tomographic models, it has very important significance for IRI upgrading [1]. We investigate the trend of global TEC between IRI TEC and GPS TEC in the spring of 2006. IRI TEC is derived from the IRI-2012 model and GPS TEC is obtained from the International GNSS service (IGS) [1, 2]. By comparing the results, IRI TEC agrees with GPS TEC very well at high latitudes. They are generally in agreement even at low latitudes for the period from evening to morning. However, differences are found from 11:00–17:00 LT at low latitudes. It can be seen that the north-south asymmetry has remarkable effect on both IRI TEC and GPS TEC, especially in the equatorial ionization anomaly (EIA). The strength of EIA crest is obviously higher in north than in south about IRI TEC, it reaches ∼11 TECU around 15° E longitude at 13:00 LT. Meanwhile, EIA crest in daytime is generally exaggerated and the noon-bite out is deep in the IRI TEC than GPS TEC, the difference of noon-bite is about 12 TECU around 105° E longitude at 13:00 LT.
{"title":"Comparison of global TEC between IRI TEC and GPS TEC in the spring of 2006","authors":"Xiaolan Wang, Qingtao Wan, T. Maruyama, G. Ma, Jinghua Li, Jiangtao Fan","doi":"10.23919/URSIGASS.2017.8105295","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105295","url":null,"abstract":"Comparison of the global Total Electron Content (TEC) derived from dual-frequency Global Positioning System (GPS) data and International Reference Ionosphere (IRI) used tomographic models, it has very important significance for IRI upgrading [1]. We investigate the trend of global TEC between IRI TEC and GPS TEC in the spring of 2006. IRI TEC is derived from the IRI-2012 model and GPS TEC is obtained from the International GNSS service (IGS) [1, 2]. By comparing the results, IRI TEC agrees with GPS TEC very well at high latitudes. They are generally in agreement even at low latitudes for the period from evening to morning. However, differences are found from 11:00–17:00 LT at low latitudes. It can be seen that the north-south asymmetry has remarkable effect on both IRI TEC and GPS TEC, especially in the equatorial ionization anomaly (EIA). The strength of EIA crest is obviously higher in north than in south about IRI TEC, it reaches ∼11 TECU around 15° E longitude at 13:00 LT. Meanwhile, EIA crest in daytime is generally exaggerated and the noon-bite out is deep in the IRI TEC than GPS TEC, the difference of noon-bite is about 12 TECU around 105° E longitude at 13:00 LT.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128599884","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105157
H. Gan, Haiyan Zhang, Y. Yue, Hao Hu, Shijie Huang, Jinyou Song, Jinghai Sun, Hongfei Liu, C. Jin
Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a Chinese mega-science project to build the largest single dish radio telescope in Guizhou province, Southwest China. The construction of FAST will involve many kinds of analog and digital electrical equipments. The electrical equipments are potential threat to radio observation due to its ElectroMagnetic Interference (EMI) emission. The EMI should be safely shielded when FAST telescope operates. The shielding effectiveness of large shielding enclosures can be tested with two log periodic antennas, signal generator and spectrum analyzer. It is not suitable to test small shielding enclosure for that is not possible to put big antenna and signal generator inside. In this paper, an effective shielding effectiveness measurement system for the small shielding enclosure is introduced. This measurement system uses a frequency synthesizer of Valon Technology as signal generator which can measure the shielding effectiveness no more than 100dB in a frequency range of 23–6000MHz. Some of measurement results of shielding effectiveness are also presented.
{"title":"Shielding effectiveness measurement for physically small enclosure in FAST telescope","authors":"H. Gan, Haiyan Zhang, Y. Yue, Hao Hu, Shijie Huang, Jinyou Song, Jinghai Sun, Hongfei Liu, C. Jin","doi":"10.23919/URSIGASS.2017.8105157","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105157","url":null,"abstract":"Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a Chinese mega-science project to build the largest single dish radio telescope in Guizhou province, Southwest China. The construction of FAST will involve many kinds of analog and digital electrical equipments. The electrical equipments are potential threat to radio observation due to its ElectroMagnetic Interference (EMI) emission. The EMI should be safely shielded when FAST telescope operates. The shielding effectiveness of large shielding enclosures can be tested with two log periodic antennas, signal generator and spectrum analyzer. It is not suitable to test small shielding enclosure for that is not possible to put big antenna and signal generator inside. In this paper, an effective shielding effectiveness measurement system for the small shielding enclosure is introduced. This measurement system uses a frequency synthesizer of Valon Technology as signal generator which can measure the shielding effectiveness no more than 100dB in a frequency range of 23–6000MHz. Some of measurement results of shielding effectiveness are also presented.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127323635","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105423
R. Beresford, W. Cheng, G. Hampson, J. Bunton, A. Brown, M. Leach, R. Shaw, P. Roberts, J. Tuthill, C. Cantrall, M. Brothers, R. Forsyth, J. Kanapathippillai, D. Kiraly, S. Mackay
The Australian Square Kilometre Pathfinder ASKAP Design Enhancement (ADE) is the second generation architecture based on a distributed antenna system (DAS) with radio over fiber transmission (RFoF) from planar phased array feed (PAF) to the central site digital signal processing (DSP). With 36 × 12m reflector antennas and 188 elements per PAF, there are 6840 ports with signal and conversion (SAC) paths. Low cost implementation is key for phased array systems comprising thousands of elements. The implementation and component choices are critical to provide a viable project delivery; balancing component availability, RF performance, power consumption, maintenance and whole of life aspects. In this paper we mention discrete components used, basic subassembly performance and fiducial end to end compliance measurements.
{"title":"Radio astronomy L-band phased array feed RFoF implementation overview","authors":"R. Beresford, W. Cheng, G. Hampson, J. Bunton, A. Brown, M. Leach, R. Shaw, P. Roberts, J. Tuthill, C. Cantrall, M. Brothers, R. Forsyth, J. Kanapathippillai, D. Kiraly, S. Mackay","doi":"10.23919/URSIGASS.2017.8105423","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105423","url":null,"abstract":"The Australian Square Kilometre Pathfinder ASKAP Design Enhancement (ADE) is the second generation architecture based on a distributed antenna system (DAS) with radio over fiber transmission (RFoF) from planar phased array feed (PAF) to the central site digital signal processing (DSP). With 36 × 12m reflector antennas and 188 elements per PAF, there are 6840 ports with signal and conversion (SAC) paths. Low cost implementation is key for phased array systems comprising thousands of elements. The implementation and component choices are critical to provide a viable project delivery; balancing component availability, RF performance, power consumption, maintenance and whole of life aspects. In this paper we mention discrete components used, basic subassembly performance and fiducial end to end compliance measurements.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127363603","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105172
M. Robinson, Xiaotian Zhang, I. Flintoft
Absorption cross section (ACS) of an object is used in stochastic power balance models, while human ACS is closely related to microwave dosimetry parameters such as specific absorption rate (SAR) and thus characterises exposure as well as effect of human bodies on multipath propagation. ACS, averaged over all directions of incidence, can be obtained in the frequency domain from the S-parameters of two antennas in a stirred-mode reverberation chamber; however, our new time domain method is faster, avoids the need to determine antenna efficiency, and has been validated with a test object of calculable ACS. We can now measure human ACS from 1 to 18GHz, to within 3%, in under 10 minutes. We have done this for 48 subjects, and explored correlations between ACS and body parameters including mass, height, surface area and subcutaneous fat thickness.
{"title":"Time domain technique for rapid, broadband measurement of human absorption cross section in a reverberation chamber","authors":"M. Robinson, Xiaotian Zhang, I. Flintoft","doi":"10.23919/URSIGASS.2017.8105172","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105172","url":null,"abstract":"Absorption cross section (ACS) of an object is used in stochastic power balance models, while human ACS is closely related to microwave dosimetry parameters such as specific absorption rate (SAR) and thus characterises exposure as well as effect of human bodies on multipath propagation. ACS, averaged over all directions of incidence, can be obtained in the frequency domain from the S-parameters of two antennas in a stirred-mode reverberation chamber; however, our new time domain method is faster, avoids the need to determine antenna efficiency, and has been validated with a test object of calculable ACS. We can now measure human ACS from 1 to 18GHz, to within 3%, in under 10 minutes. We have done this for 48 subjects, and explored correlations between ACS and body parameters including mass, height, surface area and subcutaneous fat thickness.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126948123","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105385
R. Shahidi, E. Gill
In the Ph.D. thesis of Gill, the author determines the power spectral density per unit area by finding the auto-correlation of the received voltage assuming a certain number of scatters, and then taking its Fourier transform. Here, we instead find the power spectral density using Welch's periodogram approach, where we take the Fourier transform of the expression for the received voltage, and equate the power spectral density to the expected value of the squared-magnitude of this transform. This simplifies the analysis, and leads to new insights about the first-order Bragg peaks.
{"title":"Periodogram-based derivation of first-order power spectral density from remote sensing of the ocean surface by HF-Doppler radar","authors":"R. Shahidi, E. Gill","doi":"10.23919/URSIGASS.2017.8105385","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105385","url":null,"abstract":"In the Ph.D. thesis of Gill, the author determines the power spectral density per unit area by finding the auto-correlation of the received voltage assuming a certain number of scatters, and then taking its Fourier transform. Here, we instead find the power spectral density using Welch's periodogram approach, where we take the Fourier transform of the expression for the received voltage, and equate the power spectral density to the expected value of the squared-magnitude of this transform. This simplifies the analysis, and leads to new insights about the first-order Bragg peaks.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133014433","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105139
G. Minatti, F. Caminita, E. Martini, S. Maci
This paper concerns the analysis of fields and currents on modulated metasurfaces (MTSs) and the synthesis of MTSs implementing a given field distribution. The work herein described has been developed to set up an effective design process for modulated MTSs realizing antennas with customizable pattern. Here we give a brief description of the process for the analysis, synthesis and implementation of fields in modulated MTSs in the framework of planar leaky wave antennas. As support to the discussion, numerical results are presented for highly directive beam antennas.
{"title":"Analysis and synthesis of fields in modulated metasurfaces","authors":"G. Minatti, F. Caminita, E. Martini, S. Maci","doi":"10.23919/URSIGASS.2017.8105139","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105139","url":null,"abstract":"This paper concerns the analysis of fields and currents on modulated metasurfaces (MTSs) and the synthesis of MTSs implementing a given field distribution. The work herein described has been developed to set up an effective design process for modulated MTSs realizing antennas with customizable pattern. Here we give a brief description of the process for the analysis, synthesis and implementation of fields in modulated MTSs in the framework of planar leaky wave antennas. As support to the discussion, numerical results are presented for highly directive beam antennas.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131940277","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105215
R. Dodson, M. Rioja
We provide a summary of recent work we have performed to extend phase referencing to hitherto unreachable regimes. These include very high frequencies (mm and sub-mm) where the short coherence times have prevented source switching; low frequencies, where direction dependent effects prevent source phase transfer; and decomposing the atmosphere into the Ionospheric and Tropospheric components and then correcting for these piece-wise. Results from these three approaches, Source Frequency Phase Referencing, Multi-View Phase Referencing and Multi-Frequency Phase Referencing, are presented in the context of the contribution of the atmosphere, which is to be corrected.
{"title":"Recent advances in VLBI astrometry","authors":"R. Dodson, M. Rioja","doi":"10.23919/URSIGASS.2017.8105215","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105215","url":null,"abstract":"We provide a summary of recent work we have performed to extend phase referencing to hitherto unreachable regimes. These include very high frequencies (mm and sub-mm) where the short coherence times have prevented source switching; low frequencies, where direction dependent effects prevent source phase transfer; and decomposing the atmosphere into the Ionospheric and Tropospheric components and then correcting for these piece-wise. Results from these three approaches, Source Frequency Phase Referencing, Multi-View Phase Referencing and Multi-Frequency Phase Referencing, are presented in the context of the contribution of the atmosphere, which is to be corrected.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130271659","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105336
M. Ghoraishi, S. Salous, Yuteng Gao, R. Tafazolli
The millimeter wave channel at 60 GHz for line-of-sight small cell scenarios was examined through analysis of the measured data using a wideband channel sounder. Full polarimetric directional data obtained at 3 different locations for which the emulation of small cell base-station (transmitter) antenna is at the height of 5 m from the ground floor, where the user-equipment (receiver) is located at 10 locations with different distances between 5 m to 50 m from the base-station. The base-station antenna is as wide to illumitate the small cell whereas at the user-equipment side a 5° beamwidth narrowbeam antenna is used to obtain the directional channel impulse response with high resolution in azimuth-of-arrival and delay. The analysis of the measured data confirms the dominance of the line-of-sight component with small root-mean-squared (RMS) values for delay. Few dominant scatterers can be observed at each environment which increase the delay and angular spread values.
{"title":"Millimeter wave spread in delay and azimuth for small cell propagation channel at 60 GHz","authors":"M. Ghoraishi, S. Salous, Yuteng Gao, R. Tafazolli","doi":"10.23919/URSIGASS.2017.8105336","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105336","url":null,"abstract":"The millimeter wave channel at 60 GHz for line-of-sight small cell scenarios was examined through analysis of the measured data using a wideband channel sounder. Full polarimetric directional data obtained at 3 different locations for which the emulation of small cell base-station (transmitter) antenna is at the height of 5 m from the ground floor, where the user-equipment (receiver) is located at 10 locations with different distances between 5 m to 50 m from the base-station. The base-station antenna is as wide to illumitate the small cell whereas at the user-equipment side a 5° beamwidth narrowbeam antenna is used to obtain the directional channel impulse response with high resolution in azimuth-of-arrival and delay. The analysis of the measured data confirms the dominance of the line-of-sight component with small root-mean-squared (RMS) values for delay. Few dominant scatterers can be observed at each environment which increase the delay and angular spread values.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130423400","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105171
P. Krehbiel
A long-standing question in lightning studies has concerned how lightning is initiated in thunderstorms, given the absence of physical conductors. Remote sensing observations of discharges are starting to provide the answer to this question, obtained in large part with radio frequency instruments and techniques. A recent important and unexpected step in this process has come from observations of the phenomenon called narrow bipolar events (NBEs) at NM Tech's mountain-top Langmuir Laboratory observatory in central New Mexico [1]. NBEs are fast, high current, short duration discharges that are the strongest natural sources of VHF radiation on earth [2]. They occur either in isolation from other discharges in a storm, or sometimes at the beginning of intracloud (IC) discharges [3, 4], but otherwise have eluded explanation for nearly four decades.
{"title":"Studies of lightning initiation","authors":"P. Krehbiel","doi":"10.23919/URSIGASS.2017.8105171","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105171","url":null,"abstract":"A long-standing question in lightning studies has concerned how lightning is initiated in thunderstorms, given the absence of physical conductors. Remote sensing observations of discharges are starting to provide the answer to this question, obtained in large part with radio frequency instruments and techniques. A recent important and unexpected step in this process has come from observations of the phenomenon called narrow bipolar events (NBEs) at NM Tech's mountain-top Langmuir Laboratory observatory in central New Mexico [1]. NBEs are fast, high current, short duration discharges that are the strongest natural sources of VHF radiation on earth [2]. They occur either in isolation from other discharges in a storm, or sometimes at the beginning of intracloud (IC) discharges [3, 4], but otherwise have eluded explanation for nearly four decades.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127912619","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105413
R. Tuvi, E. Heyman, T. Melamed
We present a novel strategy for tomographic inverse scattering using beam-waves processing. The theory utilizes a discrete phase-space set of beam waves, which constitutes an overcomplete frame everywhere in space, and thus can be considered as a local alternative to the conventional plane-wave or Green's function expansion sets used in the conventional theory. Specifically, we consider an ultra wide band (UWB) inversion scheme that is formulated either in the multi-frequency domain or in the the short-pulse time domain. Accordingly, the processing is performed using either a phase-space set of isodiffracting Gaussian beams (ID-GB), or a set of isodiffracting pulsed beam (ID-PB).
{"title":"Propagating beam frame: A novel formulation for local inverse scattering","authors":"R. Tuvi, E. Heyman, T. Melamed","doi":"10.23919/URSIGASS.2017.8105413","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105413","url":null,"abstract":"We present a novel strategy for tomographic inverse scattering using beam-waves processing. The theory utilizes a discrete phase-space set of beam waves, which constitutes an overcomplete frame everywhere in space, and thus can be considered as a local alternative to the conventional plane-wave or Green's function expansion sets used in the conventional theory. Specifically, we consider an ultra wide band (UWB) inversion scheme that is formulated either in the multi-frequency domain or in the the short-pulse time domain. Accordingly, the processing is performed using either a phase-space set of isodiffracting Gaussian beams (ID-GB), or a set of isodiffracting pulsed beam (ID-PB).","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127959741","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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