Pub Date : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021665
Chonghua Fang, Xinyang Shi, Lei Lu, Tianhua Yue
Quantum radar is a sort of cutting-edge technology with massive potential applications. Further, quantum radar scattering has drawn more attention from many researchers. However, there is little work has been done about the stealth design of quantum radar targets (QRT). In this study, we propose a kind of case of typical stealth design of QRT based on two plates with the given distance between them. Our 3D simulation shows that this kind of design can bring a distinct stealth effect.
{"title":"Stealth Design of the Quantum Radar Scattering Based on the Two Typical 2D Targets","authors":"Chonghua Fang, Xinyang Shi, Lei Lu, Tianhua Yue","doi":"10.1109/PIERS-Fall48861.2019.9021665","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021665","url":null,"abstract":"Quantum radar is a sort of cutting-edge technology with massive potential applications. Further, quantum radar scattering has drawn more attention from many researchers. However, there is little work has been done about the stealth design of quantum radar targets (QRT). In this study, we propose a kind of case of typical stealth design of QRT based on two plates with the given distance between them. Our 3D simulation shows that this kind of design can bring a distinct stealth effect.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122187588","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021570
Xiaoke Zhang, An Yang, P. Hu, Jianxing Li, A. Zhang
This paper proposes a dual-mode CPW-fed antenna array composed of stub-loaded slot antennas, which can be applied in the fifth generation (5G) millimeter-wave (mm-wave) applications. Each slot antenna element is fed by the coplanar waveguide (CPW). By loading a stub on a half-wavelength slot antenna, two different resonant modes can be obtained. In addition, a 6-element antenna array is presented. The distance between any two adjacent antenna elements is about one wavelength at 28GHz. The simulated results show that the designed mm-wave antenna array can realize a 29.3% impedance bandwidth with a return loss larger than 10dB and an inter-element isolation higher than 18dB from 24GHz to 32GHz. Moreover, the realized gains of the 6-element antenna array are greater than 11.5dB over the operating frequency band with maximum value of 13.9dB at 28GHz.
{"title":"Broadband CPW-fed Stub-loaded Slot Antenna Array for 5G mm-Wave Applications","authors":"Xiaoke Zhang, An Yang, P. Hu, Jianxing Li, A. Zhang","doi":"10.1109/PIERS-Fall48861.2019.9021570","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021570","url":null,"abstract":"This paper proposes a dual-mode CPW-fed antenna array composed of stub-loaded slot antennas, which can be applied in the fifth generation (5G) millimeter-wave (mm-wave) applications. Each slot antenna element is fed by the coplanar waveguide (CPW). By loading a stub on a half-wavelength slot antenna, two different resonant modes can be obtained. In addition, a 6-element antenna array is presented. The distance between any two adjacent antenna elements is about one wavelength at 28GHz. The simulated results show that the designed mm-wave antenna array can realize a 29.3% impedance bandwidth with a return loss larger than 10dB and an inter-element isolation higher than 18dB from 24GHz to 32GHz. Moreover, the realized gains of the 6-element antenna array are greater than 11.5dB over the operating frequency band with maximum value of 13.9dB at 28GHz.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122224503","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}
The granularity of electromagnetic (EM) scattering data is a key aspect in studying targets’ EM scattering characteristics. The basic EM scattering data acquiring methods are doing simulation and measurement. For targets with unknown model parameters, e.g., geometric and material parameters, it’s hard to use direct simulation method to get their detailed EM data. Due to the high cost and limited measurement conditions, the acquired EM scattering data is limited and coarse in the most time. Such EM data is not enough to study real target’s characteristics for detection and recognition. In order to expand the data acquisition ability and get more detailed data, we propose to apply boosting decision tree method for EM scattering data interpolation. The first step is making pre-process of EM scattering data. The data includes radar cross section (RCS) under different frequency, elevation and azimuth, and needs to filter the noise in measurement system. The data should be randomly divided into training and testing datasets. The next step is the decision tree ensemble design. Using the training dataset, objective function optimization and tree parameter estimation are conducted to build EM scattering characteristic based gradient boosted tree model. The last step is to validate the model using the testing dataset. The model can be used for EM scattering data interpolation to get more completed and detailed data. Meanwhile, we performed the interpolation experiment based on the method. Numerical examples have verified the functionalities of such method in EM scattering data completion and refinement, and it will support the EM study of targets with unknown model parameters.
{"title":"An EM Scattering Data Interpolation Method Based on Decision and Regression Tree","authors":"Feng Chen, Jia Zhai, Xunwang Dang, Xiaodan Xie, Yong Zhu, Hongcheng Yin","doi":"10.1109/PIERS-Fall48861.2019.9021292","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021292","url":null,"abstract":"The granularity of electromagnetic (EM) scattering data is a key aspect in studying targets’ EM scattering characteristics. The basic EM scattering data acquiring methods are doing simulation and measurement. For targets with unknown model parameters, e.g., geometric and material parameters, it’s hard to use direct simulation method to get their detailed EM data. Due to the high cost and limited measurement conditions, the acquired EM scattering data is limited and coarse in the most time. Such EM data is not enough to study real target’s characteristics for detection and recognition. In order to expand the data acquisition ability and get more detailed data, we propose to apply boosting decision tree method for EM scattering data interpolation. The first step is making pre-process of EM scattering data. The data includes radar cross section (RCS) under different frequency, elevation and azimuth, and needs to filter the noise in measurement system. The data should be randomly divided into training and testing datasets. The next step is the decision tree ensemble design. Using the training dataset, objective function optimization and tree parameter estimation are conducted to build EM scattering characteristic based gradient boosted tree model. The last step is to validate the model using the testing dataset. The model can be used for EM scattering data interpolation to get more completed and detailed data. Meanwhile, we performed the interpolation experiment based on the method. Numerical examples have verified the functionalities of such method in EM scattering data completion and refinement, and it will support the EM study of targets with unknown model parameters.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116814564","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021551
Huan-Chu Huang, Yijin Wang, Xianjing Jian
The paper presents an overview of some factors influencing the millimeter-wave (mm-Wave) antenna-in-package (AiP) solution applied to cellular phones and some corresponding promising solutions. The mentioned factors mainly involve the materials (including conductive and dielectric ones) over mm-Wave AiP arrays, challenging rounded products shapes, volumes shared with non-mm-Wave antennas, the high screen-to-body ratios. The corresponding promising solutions are the mm-Wave antennas in non-mm-Wave antennas (AiA), AiA integrating a package (AiAiP), and antenna-on-display (AoD).
{"title":"Overview of Some Factors Influencing the mm-Wave AiP Solution in Cellular Phones and Some Corresponding Promising Solutions","authors":"Huan-Chu Huang, Yijin Wang, Xianjing Jian","doi":"10.1109/PIERS-Fall48861.2019.9021551","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021551","url":null,"abstract":"The paper presents an overview of some factors influencing the millimeter-wave (mm-Wave) antenna-in-package (AiP) solution applied to cellular phones and some corresponding promising solutions. The mentioned factors mainly involve the materials (including conductive and dielectric ones) over mm-Wave AiP arrays, challenging rounded products shapes, volumes shared with non-mm-Wave antennas, the high screen-to-body ratios. The corresponding promising solutions are the mm-Wave antennas in non-mm-Wave antennas (AiA), AiA integrating a package (AiAiP), and antenna-on-display (AoD).","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128507449","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021912
Mingtao Bai, W. Ren, Z. Xue, Weiming Li
The problem of surface wave coupling between microstrip antennas especially multi-band antennas is widely studied by researchers in recent years. In this paper, a novel dual-bandgap electromagnetic bandgap (EBG) structure is proposed, which is used to improve the isolation between dual-band microstrip antennas. On the base of mushroom-like electromagnetic bandgap structure, this EBG structure is designed to suppress the surface wave, then improve the isolation between the microstrip antennas. This dual-bandgap EBG structure consists of an internal small patch, an external ring patch and two metallized vias. An equivalent LC circuit model for this EBG structure is proposed: the first LC resonance is formed by the internal patch, the vias and external patch, while the second is constructed by the internal patch, the vias, the external patch and the adjacent external patch. To analyze the dual-bandgap properties of the above equivalent circuit model, the dispersion diagram of the EBG structure based on the rectangular (irreducible) Brillouin zone in HFSS is given in this paper. In order to verify the effectiveness of this new dual-bandgap EBG structure, a dual-band microstrip patch antenna is also designed, which obtains a dual-frequency characteristic by surface slotting. Finally, the dual-bandgap EBG structure is placed between two identical dual-frequency microstrip antennas on the same layer, sharing a floor. The S21 before and after adding the EBG structure are compared. The results show that the addition of this new EBG structure can reduced the S21 of lower band by 3 dB and upper band by 9 dB, which effectively suppresses the surface waves and increases the isolation of the antennas in the two bands.
{"title":"The Design of EBG for Enhancing the Isolation in Dual-band Microstrip Antennas","authors":"Mingtao Bai, W. Ren, Z. Xue, Weiming Li","doi":"10.1109/PIERS-Fall48861.2019.9021912","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021912","url":null,"abstract":"The problem of surface wave coupling between microstrip antennas especially multi-band antennas is widely studied by researchers in recent years. In this paper, a novel dual-bandgap electromagnetic bandgap (EBG) structure is proposed, which is used to improve the isolation between dual-band microstrip antennas. On the base of mushroom-like electromagnetic bandgap structure, this EBG structure is designed to suppress the surface wave, then improve the isolation between the microstrip antennas. This dual-bandgap EBG structure consists of an internal small patch, an external ring patch and two metallized vias. An equivalent LC circuit model for this EBG structure is proposed: the first LC resonance is formed by the internal patch, the vias and external patch, while the second is constructed by the internal patch, the vias, the external patch and the adjacent external patch. To analyze the dual-bandgap properties of the above equivalent circuit model, the dispersion diagram of the EBG structure based on the rectangular (irreducible) Brillouin zone in HFSS is given in this paper. In order to verify the effectiveness of this new dual-bandgap EBG structure, a dual-band microstrip patch antenna is also designed, which obtains a dual-frequency characteristic by surface slotting. Finally, the dual-bandgap EBG structure is placed between two identical dual-frequency microstrip antennas on the same layer, sharing a floor. The S21 before and after adding the EBG structure are compared. The results show that the addition of this new EBG structure can reduced the S21 of lower band by 3 dB and upper band by 9 dB, which effectively suppresses the surface waves and increases the isolation of the antennas in the two bands.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128695257","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021302
Zhili Wang
With the development of radar technology, frequency agile radar has been widely used in military because of its benefit in anti-jamming situation. In the battlefield, some friendly radars of which the signals are overlapped in the frequency range may interfere with each other when they work synchronously. The interference among friendly radars is mainly caused by the sideband signals of each other, and the spectrums of interference signals are known as they are emitted from friendly equipment. In this paper, the response of radar receiver is analyzed when sideband part of interference signal is injected into the receiver, and a calculation model of sideband signal response is proposed. The probability distribution of frequency alignment between the interference signal and the frequency agile radar receiver is analyzed. Furthermore, an interference probability calculation model of frequency agile radar that is interfered by the sideband signal jamming is proposed based on the jamming power calculation model. With modeling the frequency agile radar and friendly radars in the battlefield situation, the typical friendly radar jamming scenarios are simulated in computer, and the results produced by the calculation model are compared with the simulation results to verify the validity of the calculation model proposed in this paper. The interference probability calculation method of frequency agile radar based on the spectrum of interference signal proposed in this paper can be further extended to calculate the jamming probability of frequency agile radar in electronic countermeasure environment.
{"title":"Interference Probability Calculation Method of Frequency Agile Radar Based on the Spectrum of Interference Signal","authors":"Zhili Wang","doi":"10.1109/PIERS-Fall48861.2019.9021302","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021302","url":null,"abstract":"With the development of radar technology, frequency agile radar has been widely used in military because of its benefit in anti-jamming situation. In the battlefield, some friendly radars of which the signals are overlapped in the frequency range may interfere with each other when they work synchronously. The interference among friendly radars is mainly caused by the sideband signals of each other, and the spectrums of interference signals are known as they are emitted from friendly equipment. In this paper, the response of radar receiver is analyzed when sideband part of interference signal is injected into the receiver, and a calculation model of sideband signal response is proposed. The probability distribution of frequency alignment between the interference signal and the frequency agile radar receiver is analyzed. Furthermore, an interference probability calculation model of frequency agile radar that is interfered by the sideband signal jamming is proposed based on the jamming power calculation model. With modeling the frequency agile radar and friendly radars in the battlefield situation, the typical friendly radar jamming scenarios are simulated in computer, and the results produced by the calculation model are compared with the simulation results to verify the validity of the calculation model proposed in this paper. The interference probability calculation method of frequency agile radar based on the spectrum of interference signal proposed in this paper can be further extended to calculate the jamming probability of frequency agile radar in electronic countermeasure environment.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128635323","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021439
S. M. Lu, W. Song, C. Huang
Electronic current transformer (ECT) is widely used in test and measuring. As a key part of ECT, Rogowski coil should be installed correctly to give a precise measurement. Thus, we give qualitative and quantitative analysis on some situation that may influence the measuring accuracy and use Maxwell to verify it. The calculation result shows that the interference factors mentioned have influence on the measuring accuracy on certain level. And the simulation result confirms that.
{"title":"Study of Measuring Error of Rogowski Coil","authors":"S. M. Lu, W. Song, C. Huang","doi":"10.1109/PIERS-Fall48861.2019.9021439","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021439","url":null,"abstract":"Electronic current transformer (ECT) is widely used in test and measuring. As a key part of ECT, Rogowski coil should be installed correctly to give a precise measurement. Thus, we give qualitative and quantitative analysis on some situation that may influence the measuring accuracy and use Maxwell to verify it. The calculation result shows that the interference factors mentioned have influence on the measuring accuracy on certain level. And the simulation result confirms that.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124567653","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021921
Dawei Zhang, Kuang Zhang, Qun Wu, T. Jiang
In this work, high-order mode of spoof surface plasmon polaritons (SSPPs) with a broadband feature is supported by compact complementary structure. The proposed structure is constructed by microstrip lines with T-shaped complementary grooves, which can realize a decrease in transverse size of 75% in comparison with the rectangular grooves. More importantly, the operating bandwidth of high-order mode of SSPPs is greatly improved. Then a smooth and simple transition with gradient grooves is proposed to realize high-efficiency excitation of high-order mode of SSPPs and seamless connections between SSPP structure and microstrip lines. Based on the proposed transition, an SSPP waveguide is designed and simulated. The numerical results validate efficient excitation and broadband propagation (up to 12.1 GHz) of high-order mode of SSPPs. This work can find significant potential applications in designing high-performance antennas at microwave frequencies.
{"title":"Broadband Propagation of High-order Mode of Spoof Surface Plasmon Polaritons Supported by Compact Complementary Structure","authors":"Dawei Zhang, Kuang Zhang, Qun Wu, T. Jiang","doi":"10.1109/PIERS-Fall48861.2019.9021921","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021921","url":null,"abstract":"In this work, high-order mode of spoof surface plasmon polaritons (SSPPs) with a broadband feature is supported by compact complementary structure. The proposed structure is constructed by microstrip lines with T-shaped complementary grooves, which can realize a decrease in transverse size of 75% in comparison with the rectangular grooves. More importantly, the operating bandwidth of high-order mode of SSPPs is greatly improved. Then a smooth and simple transition with gradient grooves is proposed to realize high-efficiency excitation of high-order mode of SSPPs and seamless connections between SSPP structure and microstrip lines. Based on the proposed transition, an SSPP waveguide is designed and simulated. The numerical results validate efficient excitation and broadband propagation (up to 12.1 GHz) of high-order mode of SSPPs. This work can find significant potential applications in designing high-performance antennas at microwave frequencies.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124572497","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021828
Zhiqiang Yang, Yongli Ji, Zhiqiang Li, Huaxiong Wang, Fengyun Guo
Long distance cross-well electromagnetic imaging method can explain the formation profile more than 500 m. The emphasis and difficulty of formation data inversion focus on the accuracy and speed for inversion imaging. Inversion imaging uses iterative method to gradually reduce the difference between the forward model and the measured results to approximate the real formation. Forward calculation includes Green’s function method, finite element method and finite difference method. The calculation process of Green’s function method in axisymmetric coordinates is simple, but it needs to know the background resistivity. The calculation accuracy decreases with the increase of distance, which affects the inversion imaging accuracy. Finite element method and finite difference method establish large linear equations in Cartesian coordinates to solve the singular matrix, which is inefficient. The advantage of inversion imaging is that the Jacobian matrix can be solved by the reciprocity theorem. In this paper, numerical mode matching method is proposed for forward calculation for the first time, which has the characteristics of longitudinal analysis and lateral approximation, and takes into account both accuracy and efficiency. However, in axisymmetric coordinates, the reciprocity theorem cannot be used to solve Jacobian matrix, and the inversion efficiency is too low through difference approximated Jacob matrix calculation. In this paper, a fast algorithm for computing Jacobian matrix by using Green function method instead of difference approximation method is proposed under axisymmetric coordinates. Jacobian matrix can be obtained only by the product of one forward and one Green function. Then the method is verified by contrast with the result of difference approximation method. It improves the calculation speed significantly. The simulation results under formation model show that the Gauss-Newton inverse algorithm with modified Green function Jacob calculation applied in long distance cross-well electromagnetic imaging logging system is feasible for axial symmetry 2D non-uniform formation. The parameters and bounders can be determined for 2D formation. The speed is dozens of times faster than difference approximation method.
{"title":"A Fast Forward and Inversion Method for Long Distance Cross-well Electromagnetic Imaging Logging System","authors":"Zhiqiang Yang, Yongli Ji, Zhiqiang Li, Huaxiong Wang, Fengyun Guo","doi":"10.1109/PIERS-Fall48861.2019.9021828","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021828","url":null,"abstract":"Long distance cross-well electromagnetic imaging method can explain the formation profile more than 500 m. The emphasis and difficulty of formation data inversion focus on the accuracy and speed for inversion imaging. Inversion imaging uses iterative method to gradually reduce the difference between the forward model and the measured results to approximate the real formation. Forward calculation includes Green’s function method, finite element method and finite difference method. The calculation process of Green’s function method in axisymmetric coordinates is simple, but it needs to know the background resistivity. The calculation accuracy decreases with the increase of distance, which affects the inversion imaging accuracy. Finite element method and finite difference method establish large linear equations in Cartesian coordinates to solve the singular matrix, which is inefficient. The advantage of inversion imaging is that the Jacobian matrix can be solved by the reciprocity theorem. In this paper, numerical mode matching method is proposed for forward calculation for the first time, which has the characteristics of longitudinal analysis and lateral approximation, and takes into account both accuracy and efficiency. However, in axisymmetric coordinates, the reciprocity theorem cannot be used to solve Jacobian matrix, and the inversion efficiency is too low through difference approximated Jacob matrix calculation. In this paper, a fast algorithm for computing Jacobian matrix by using Green function method instead of difference approximation method is proposed under axisymmetric coordinates. Jacobian matrix can be obtained only by the product of one forward and one Green function. Then the method is verified by contrast with the result of difference approximation method. It improves the calculation speed significantly. The simulation results under formation model show that the Gauss-Newton inverse algorithm with modified Green function Jacob calculation applied in long distance cross-well electromagnetic imaging logging system is feasible for axial symmetry 2D non-uniform formation. The parameters and bounders can be determined for 2D formation. The speed is dozens of times faster than difference approximation method.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124658388","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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