Pub Date : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861789
M. Sanamzadeh, L. Tsang
Statistical nature of the problem introduces a randomness in the phase of the electromagnetic field such that the fields are not coherent after traveling in the medium for a few correlation lengths. It is shown that for such a problem we can use a combined coherent-incoherent approach to greatly reduce the complexity of the problem.
{"title":"A Partially Coherent Approach for Scattering of Electromagnetic Waves from Random Layered Media with 3D Rough Interfaces","authors":"M. Sanamzadeh, L. Tsang","doi":"10.1109/USNC-URSI.2019.8861789","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861789","url":null,"abstract":"Statistical nature of the problem introduces a randomness in the phase of the electromagnetic field such that the fields are not coherent after traveling in the medium for a few correlation lengths. It is shown that for such a problem we can use a combined coherent-incoherent approach to greatly reduce the complexity of the problem.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127837903","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 : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861918
Yang Su, R. Mittra
In this paper, we present a scheme for efficient numerical modeling of operating at millimeter wavelength, e.g., 30 GHz. One of the key features of the method is the GPU acceleration adapted for the Characteristic Basis Function Method (CBFM) acceleration for problems involving layered media, which to the best of our knowledge has not been done in the past.
{"title":"GPU-Acceleration of Characteristic Basis Function Method (CBFM) for Efficient Analysis of Complex Platforms involving Layered Media","authors":"Yang Su, R. Mittra","doi":"10.1109/USNC-URSI.2019.8861918","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861918","url":null,"abstract":"In this paper, we present a scheme for efficient numerical modeling of operating at millimeter wavelength, e.g., 30 GHz. One of the key features of the method is the GPU acceleration adapted for the Characteristic Basis Function Method (CBFM) acceleration for problems involving layered media, which to the best of our knowledge has not been done in the past.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125776627","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 : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861703
A. Sutinjo, L. Belostotski
We derive an analytical expression of the determinant of the 4 × 4 noise parameter extraction matrix based on a slight modification of the matrix in [1]. We specialize the derivation to a very useful and practicable case in which one of the impedance points is the center of the Smith chart. The resulting expression is simple and provides very useful guidance for impedance selection. We illustrate this with an example of a wideband noise parameter extraction in the low-frequency radio astronomy band of 50 to 350 MHz.
{"title":"Analytical Determinant of the Noise Parameter Extraction Matrix and Its Applications","authors":"A. Sutinjo, L. Belostotski","doi":"10.1109/USNC-URSI.2019.8861703","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861703","url":null,"abstract":"We derive an analytical expression of the determinant of the 4 × 4 noise parameter extraction matrix based on a slight modification of the matrix in [1]. We specialize the derivation to a very useful and practicable case in which one of the impedance points is the center of the Smith chart. The resulting expression is simple and provides very useful guidance for impedance selection. We illustrate this with an example of a wideband noise parameter extraction in the low-frequency radio astronomy band of 50 to 350 MHz.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126913596","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 : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861916
Anton Schlegel, Serge R. Mghabghab, J. Nanzer
High-accuracy ranging measurements require precise knowledge of systematic delays caused by latencies in the hardware system. In this work, a calibration procedure for estimating such delays using intrinsic crosstalk between the transmit and receive hardware internal to a Software-Defined Radio (SDR) is presented. Since the crosstalk contains a distorted and attenuated version of the transmitted waveform, the signal received on the receiver channel is processed using a matched-filter to increase the processing gain; the delay between transmission is reception of the crosstalk signal provides an estimate of the intrinsic delays in the system. Since the internal latency is generally static after the hardware is initialized, such a calibration may only need to be performed once at system startup. The approach is demonstrated using SDR hardware and shows centimeter-level delay accuracies for waveforms of 7 ms length and 500 kHz bandwidth.
{"title":"Crosstalk-Based Calibration for High Accuracy Ranging Using Software-Defined Radios","authors":"Anton Schlegel, Serge R. Mghabghab, J. Nanzer","doi":"10.1109/USNC-URSI.2019.8861916","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861916","url":null,"abstract":"High-accuracy ranging measurements require precise knowledge of systematic delays caused by latencies in the hardware system. In this work, a calibration procedure for estimating such delays using intrinsic crosstalk between the transmit and receive hardware internal to a Software-Defined Radio (SDR) is presented. Since the crosstalk contains a distorted and attenuated version of the transmitted waveform, the signal received on the receiver channel is processed using a matched-filter to increase the processing gain; the delay between transmission is reception of the crosstalk signal provides an estimate of the intrinsic delays in the system. Since the internal latency is generally static after the hardware is initialized, such a calibration may only need to be performed once at system startup. The approach is demonstrated using SDR hardware and shows centimeter-level delay accuracies for waveforms of 7 ms length and 500 kHz bandwidth.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130146696","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 : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861952
R. Lang, C. Suer, D. Breton, C. Haedrich
The White Mountains in New Hampshire provide a location where UHF non-line of sight (NLOS) paths become important. Because line of sight (LOS) paths are often blocked, reflections from adjacent tree covered slopes, visible to both transmitter and receiver, provide a bistatic propagation path with sufficient intensity. The question of the reflection mechanism will be discussed using broad band measurements and forest models.
{"title":"UHF Mountain Propagation: Measurements and Modelling","authors":"R. Lang, C. Suer, D. Breton, C. Haedrich","doi":"10.1109/USNC-URSI.2019.8861952","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861952","url":null,"abstract":"The White Mountains in New Hampshire provide a location where UHF non-line of sight (NLOS) paths become important. Because line of sight (LOS) paths are often blocked, reflections from adjacent tree covered slopes, visible to both transmitter and receiver, provide a bistatic propagation path with sufficient intensity. The question of the reflection mechanism will be discussed using broad band measurements and forest models.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128962963","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 : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861697
Shilpa Manandhar, J. Tan, Y. Lee, Y. S. Meng
In this paper, Global Positioning System (GPS) derived slant path residual values are studied with respect to a rainfall event. Slant path residuals can be defined as the difference between the slant path wet delay at a particular elevation angle and the zenith wet delay projected to that elevation angle. The slant path residual values are corrected for multipath using multipath stacking algorithm. The corrected residuals show a good correlation with a rainfall event. It is observed that the standard deviation (SD) of the residuals is higher during a rainy time period. The slant path residuals can be used as an added feature in the existing algorithms to improve the rainfall prediction results.
{"title":"GPS Slant Path Residuals for Rainfall Detection","authors":"Shilpa Manandhar, J. Tan, Y. Lee, Y. S. Meng","doi":"10.1109/USNC-URSI.2019.8861697","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861697","url":null,"abstract":"In this paper, Global Positioning System (GPS) derived slant path residual values are studied with respect to a rainfall event. Slant path residuals can be defined as the difference between the slant path wet delay at a particular elevation angle and the zenith wet delay projected to that elevation angle. The slant path residual values are corrected for multipath using multipath stacking algorithm. The corrected residuals show a good correlation with a rainfall event. It is observed that the standard deviation (SD) of the residuals is higher during a rainy time period. The slant path residuals can be used as an added feature in the existing algorithms to improve the rainfall prediction results.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125177252","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 : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861872
Islam Afifi, M. Ali, A. Sebak
Nowadays there is much interest in working at the millimeter wave range. Crossover is an important component in microwave systems and beam forming networks. In this paper, a planar simple design crossover is presented with analytical analysis. It is built using the printed ridge gap technology which has low dielectric losses as the wave propagated mainly in an air gap region. The crossover has a bandwidth of 0.5 GHz (from 29.75 to 30.25 GHz) with insertion loss less than 0.6 dB and the isolation and return loss are better than 15 dB.
{"title":"Analysis and design of a 30 GHz printed ridge gap Ring-crossover","authors":"Islam Afifi, M. Ali, A. Sebak","doi":"10.1109/USNC-URSI.2019.8861872","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861872","url":null,"abstract":"Nowadays there is much interest in working at the millimeter wave range. Crossover is an important component in microwave systems and beam forming networks. In this paper, a planar simple design crossover is presented with analytical analysis. It is built using the printed ridge gap technology which has low dielectric losses as the wave propagated mainly in an air gap region. The crossover has a bandwidth of 0.5 GHz (from 29.75 to 30.25 GHz) with insertion loss less than 0.6 dB and the isolation and return loss are better than 15 dB.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130166455","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 : 2019-07-01DOI: 10.1109/USNC-URSI.2019.8861869
Stavros Vakalis, Liang Gong, Eric Klinefelter, J. Nanzer
The operation of a millimeter-wave interferometric radar for estimating the angle of a target is discussed in this paper. The transmitter emits a linear frequency modulated (LFM) signal, ranging from 37 GHz to 39 GHz. The millimeter-wave interferometric receiver is composed by two receive antenna elements separated by 51 cm (64.6λ). The number of sidelobes in the radiation pattern will change as a function of frequency, generating a frequency response that can be transformed to the angle of a target. The theory behind the technique is explained, supported by the experimental measurements.
本文讨论了毫米波干涉雷达在目标角度估计中的工作原理。发射机发射线性调频(LFM)信号，范围从37 GHz到39 GHz。毫米波干涉接收机由两个相距51 cm (64.6λ)的接收天线单元组成。辐射图中的副瓣数将随频率的变化而变化，产生频率响应，该频率响应可以转换为目标的角度。该技术背后的理论被解释，由实验测量支持。
{"title":"Angle Estimation Using an Active 38 GHz Interferometric Radar","authors":"Stavros Vakalis, Liang Gong, Eric Klinefelter, J. Nanzer","doi":"10.1109/USNC-URSI.2019.8861869","DOIUrl":"https://doi.org/10.1109/USNC-URSI.2019.8861869","url":null,"abstract":"The operation of a millimeter-wave interferometric radar for estimating the angle of a target is discussed in this paper. The transmitter emits a linear frequency modulated (LFM) signal, ranging from 37 GHz to 39 GHz. The millimeter-wave interferometric receiver is composed by two receive antenna elements separated by 51 cm (64.6λ). The number of sidelobes in the radiation pattern will change as a function of frequency, generating a frequency response that can be transformed to the angle of a target. The theory behind the technique is explained, supported by the experimental measurements.","PeriodicalId":383603,"journal":{"name":"2019 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133612736","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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