Pub Date : 2022-04-25DOI: 10.1109/piers55526.2022.9793105
Qi Sun, Lei Ji, Xiaochun Li, Junfa Mao
In this paper, by analyzing the dispersion characteristics of the dielectric waveguide (DWG) and the return loss of the transition with different lengths, a back-to-back coplanar waveguide (CPW)-DWG-CPW transition is proposed. In the transition part, a DWG with a wedge-shaped structure is placed on the center of the CPW transmission line without gap. In order to bind electromagnetic waves in waveguides, the DWG uses dielectric material with high dielectric constant. The back-to-back CPW-DWG-CPW transition is designed based on PCB process.The transition and DWG designed in this paper work at 125 GHz–155 GHz and the minimum insertion loss is 1. 7dB at 152 GHz.
{"title":"A Low-loss CPW-DWG-CPW Transition","authors":"Qi Sun, Lei Ji, Xiaochun Li, Junfa Mao","doi":"10.1109/piers55526.2022.9793105","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793105","url":null,"abstract":"In this paper, by analyzing the dispersion characteristics of the dielectric waveguide (DWG) and the return loss of the transition with different lengths, a back-to-back coplanar waveguide (CPW)-DWG-CPW transition is proposed. In the transition part, a DWG with a wedge-shaped structure is placed on the center of the CPW transmission line without gap. In order to bind electromagnetic waves in waveguides, the DWG uses dielectric material with high dielectric constant. The back-to-back CPW-DWG-CPW transition is designed based on PCB process.The transition and DWG designed in this paper work at 125 GHz–155 GHz and the minimum insertion loss is 1. 7dB at 152 GHz.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115135068","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 : 2022-04-25DOI: 10.1109/piers55526.2022.9793260
Baitong Chu, G. Cheng
In this paper, the characteristic mode theory (CMT) is applied to the analysis of the ultrawideband (UWB) antennas. The effect of each mode on the radiation of the antenna can be known by analyzing the modal weighting coefficients (MWC). Depending on the location and magnitude of the mode current, additional slots are introduced to block the current. An UWB antenna with three kinds of band-notched antenna is designed.
{"title":"Design of Band-notched UWB Antenna Based on Characteristic Mode Theory","authors":"Baitong Chu, G. Cheng","doi":"10.1109/piers55526.2022.9793260","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793260","url":null,"abstract":"In this paper, the characteristic mode theory (CMT) is applied to the analysis of the ultrawideband (UWB) antennas. The effect of each mode on the radiation of the antenna can be known by analyzing the modal weighting coefficients (MWC). Depending on the location and magnitude of the mode current, additional slots are introduced to block the current. An UWB antenna with three kinds of band-notched antenna is designed.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"12 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669164","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 : 2022-04-25DOI: 10.1109/piers55526.2022.9793019
Xinke Zhao, Leijun Xu
In this paper, a frequency tripler is designed to improve the output power and poor matching of traditional frequency tripler. Balun and passive components are designed for achieve good matching performance while suppressing fundamental wave and even harmonic wave. By using 180 nm CMOS technology, the 3-dB bandwidth spans 31.5 GHz ~ 36 GHz, the output power can be achieved to 7.9 dBm when injecting RF signal power of 0 dBm, the DC power consumption of the tripler is 36.9 mW with the power supply of 1.8 V.
{"title":"A RF Frequency Tripler with High Output Power in 180nm CMOS","authors":"Xinke Zhao, Leijun Xu","doi":"10.1109/piers55526.2022.9793019","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793019","url":null,"abstract":"In this paper, a frequency tripler is designed to improve the output power and poor matching of traditional frequency tripler. Balun and passive components are designed for achieve good matching performance while suppressing fundamental wave and even harmonic wave. By using 180 nm CMOS technology, the 3-dB bandwidth spans 31.5 GHz ~ 36 GHz, the output power can be achieved to 7.9 dBm when injecting RF signal power of 0 dBm, the DC power consumption of the tripler is 36.9 mW with the power supply of 1.8 V.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125167702","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 : 2022-04-25DOI: 10.1109/piers55526.2022.9792685
Hongrui Zhang, Zhuo Wang, Hanting Zhao, Menglin Wei, Ya Shuang, Lianlin Li
Behavior recognition technology is a key technology for computers to monitor and understand what people are doing in the era of artificial intelligence. Taking advantage of the all-weather, all-day and penetrating characteristics of microwave, we propose a microwave-based human action recognition method that can perform real-time and efficient data processing and analysis without the deliberate cooperation of the testers, and solve the shortcomings of optical and video-based methods. We use the programmable metasurface to control and focus electromagnetic waves for the preparation of data set, and then design the specific recurrent neural network (M RNN) and the convolutional neural network (M-CNN) suitable for dynamic microwave data. In this work, we can either convert the microwave data of human into optical images using deep learning so as to visualize the microwave information and perform action recognition in the computer vision field; or extract the characteristics of the microwave data of the human body in order to directly recognize different actions, including gait, gesture, movement, etc. Finally, we verified the effectiveness and robustness of this method through experiments.
{"title":"Metamaterials Based Intelligent Microwave Human Behavior Recognition","authors":"Hongrui Zhang, Zhuo Wang, Hanting Zhao, Menglin Wei, Ya Shuang, Lianlin Li","doi":"10.1109/piers55526.2022.9792685","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792685","url":null,"abstract":"Behavior recognition technology is a key technology for computers to monitor and understand what people are doing in the era of artificial intelligence. Taking advantage of the all-weather, all-day and penetrating characteristics of microwave, we propose a microwave-based human action recognition method that can perform real-time and efficient data processing and analysis without the deliberate cooperation of the testers, and solve the shortcomings of optical and video-based methods. We use the programmable metasurface to control and focus electromagnetic waves for the preparation of data set, and then design the specific recurrent neural network (M RNN) and the convolutional neural network (M-CNN) suitable for dynamic microwave data. In this work, we can either convert the microwave data of human into optical images using deep learning so as to visualize the microwave information and perform action recognition in the computer vision field; or extract the characteristics of the microwave data of the human body in order to directly recognize different actions, including gait, gesture, movement, etc. Finally, we verified the effectiveness and robustness of this method through experiments.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125923224","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}
Photonic crystal is a structure formed by arranging materials with different dielectric coefficients in space according to a certain period. Photonic crystal has a variety of applications, e.g., can be used to design photonic crystal fibers, cavity optomechanics, photonic crystal antennas, etc. Most of the raw materials for the photonic crystal are Si, SiN, GaAs, etc., and lithium niobate is a new type of photonic crystal material, because of its rich photoelectric effect, stable physical and chemical properties, and wide light transmission range. With the continuous development of lithium niobate single crystal thin film processing technology, it is now possible to provide single crystal thin film lithium niobate with a thickness of 300-900nm, making it possible to use lithium niobate for photonic crystal fabrications. Therefore, this paper investigates and simulates the wide bandgap characteristics of lithium niobate photonic crystals. By using finite difference time domain (FDTD) method, the simulations and investigations of the photonic bandgap in a hole-shaped lithium niobate on insulator silica is provided in this paper, through controlling the ratio among the lattice constant, the radius of the air hole layer and the thickness of lithium niobate layer. The results indicate that the radius of the air hole and the thickness of the lithium niobate photonic crystal will affect the center wavelength and bandwidth of the photonic crystal bandgap. And when the ratio of the radius to the lattice constant is about 0.35, by adjusting the thickness of the lithium niobate, a lithium niobate photonic crystal with a wide bandgap of 1387 nm-1726 nm is obtained. Based on this optimization results, the lithium niobate photonic crystal cavity with high Q factor, and also the lithium niobate photonic crystal optomechanical cavity can be achieved.
{"title":"Research on Lithium Niobate-based Photonic Crystal with Wide Bandgap","authors":"Dingwei Chen, Jiangbo Wu, Xiangbin Zheng, Xing Yan, Chang-Kang Hu, Jian Li, Yongjun Huang, G. Wen","doi":"10.1109/piers55526.2022.9793145","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793145","url":null,"abstract":"Photonic crystal is a structure formed by arranging materials with different dielectric coefficients in space according to a certain period. Photonic crystal has a variety of applications, e.g., can be used to design photonic crystal fibers, cavity optomechanics, photonic crystal antennas, etc. Most of the raw materials for the photonic crystal are Si, SiN, GaAs, etc., and lithium niobate is a new type of photonic crystal material, because of its rich photoelectric effect, stable physical and chemical properties, and wide light transmission range. With the continuous development of lithium niobate single crystal thin film processing technology, it is now possible to provide single crystal thin film lithium niobate with a thickness of 300-900nm, making it possible to use lithium niobate for photonic crystal fabrications. Therefore, this paper investigates and simulates the wide bandgap characteristics of lithium niobate photonic crystals. By using finite difference time domain (FDTD) method, the simulations and investigations of the photonic bandgap in a hole-shaped lithium niobate on insulator silica is provided in this paper, through controlling the ratio among the lattice constant, the radius of the air hole layer and the thickness of lithium niobate layer. The results indicate that the radius of the air hole and the thickness of the lithium niobate photonic crystal will affect the center wavelength and bandwidth of the photonic crystal bandgap. And when the ratio of the radius to the lattice constant is about 0.35, by adjusting the thickness of the lithium niobate, a lithium niobate photonic crystal with a wide bandgap of 1387 nm-1726 nm is obtained. Based on this optimization results, the lithium niobate photonic crystal cavity with high Q factor, and also the lithium niobate photonic crystal optomechanical cavity can be achieved.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129432144","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 : 2022-04-25DOI: 10.1109/piers55526.2022.9793096
Huashan Yang, Hao Zhang, Zongxin Ju, Yifan Wu, Jijun He, S. Pan
We demonstrate an integrated microwave photonic filter (MPF) with in situ programmability based on two-soliton microcomb. The relative angle of the two solitons can be arbitrarily tuned from 11° to 180° by the avoided mode crossing (AMX) which is controlled by a double ring resonator structure. The passband frequency of the proposed RF filter can be consequently tuned from 0.5GHz to 9 GHz.
{"title":"Programmable Photonic RF Filter Based on Two-soliton Microcombs","authors":"Huashan Yang, Hao Zhang, Zongxin Ju, Yifan Wu, Jijun He, S. Pan","doi":"10.1109/piers55526.2022.9793096","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793096","url":null,"abstract":"We demonstrate an integrated microwave photonic filter (MPF) with in situ programmability based on two-soliton microcomb. The relative angle of the two solitons can be arbitrarily tuned from 11° to 180° by the avoided mode crossing (AMX) which is controlled by a double ring resonator structure. The passband frequency of the proposed RF filter can be consequently tuned from 0.5GHz to 9 GHz.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130560547","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 : 2022-04-25DOI: 10.1109/piers55526.2022.9792585
Hanting Zhao, Menglin Wei, Zhuo Wang, Hongrui Zhang, Ya Shuang, Lianlin Li
In this work, we built an accurate mathematical model of the 1-bit metasurface based on the time-reversal theory. Based on this theory we Figure out how the number and the position of transmitters and receivers influence the communication capacity in different areas. We give out the EM manipulation ability difference between the ideal metasurface and the 1-bit quantization metasurface. Meanwhile, we introduce a fast coding optimization algorithm to get the pattern needed for the programable metasurface to establish the stale, efficient, secure connection between the transmitter and the receiver. Theoretical analysis shows that the EM manipulation ability of the 1-bit metasurface can keep pace with the ideal metasurface and it is sufficient to implement passive wireless communication and sensing especially in the inpatient ward, old people’s home, classroom, and other indoor living spaces.
{"title":"Wireless Channel Design and Optimization Method for 1-bit Programmable Metasurface","authors":"Hanting Zhao, Menglin Wei, Zhuo Wang, Hongrui Zhang, Ya Shuang, Lianlin Li","doi":"10.1109/piers55526.2022.9792585","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792585","url":null,"abstract":"In this work, we built an accurate mathematical model of the 1-bit metasurface based on the time-reversal theory. Based on this theory we Figure out how the number and the position of transmitters and receivers influence the communication capacity in different areas. We give out the EM manipulation ability difference between the ideal metasurface and the 1-bit quantization metasurface. Meanwhile, we introduce a fast coding optimization algorithm to get the pattern needed for the programable metasurface to establish the stale, efficient, secure connection between the transmitter and the receiver. Theoretical analysis shows that the EM manipulation ability of the 1-bit metasurface can keep pace with the ideal metasurface and it is sufficient to implement passive wireless communication and sensing especially in the inpatient ward, old people’s home, classroom, and other indoor living spaces.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125626203","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}
Applicable visualization strategies are required to achieve quick inspection and interpretation of polarimetric synthetic aperture radar (PolSAR) images. However, the visual effect of PolSAR images may be susceptible to the possibly existent large dynamic range of PolSAR data. In this paper, a simplified method for adjusting the large dynamic range of PolSAR data is developed, which is similar to the “MinMaxContrastMedian” technique adopted by Pottier et al. in their visualization strategy within the PolSARpro software. Based on this simplified method and the red-green-blue color model, a novel color visualization strategy for three-component model-based polarimetric decomposition is further proposed. The feasibility and validity of the proposed strategy is verified by the measured PolSAR data of Oberpfaffenhofen obtained by DLR L-band E-SAR.
{"title":"On the Color Visualization of Three-component Model-based Decomposition for Polarimetric SAR Data","authors":"Xun Wang, Dong Li, Yunhua Zhang, Jiefang Yang, Liting Liang","doi":"10.1109/PIERS55526.2022.9792977","DOIUrl":"https://doi.org/10.1109/PIERS55526.2022.9792977","url":null,"abstract":"Applicable visualization strategies are required to achieve quick inspection and interpretation of polarimetric synthetic aperture radar (PolSAR) images. However, the visual effect of PolSAR images may be susceptible to the possibly existent large dynamic range of PolSAR data. In this paper, a simplified method for adjusting the large dynamic range of PolSAR data is developed, which is similar to the “MinMaxContrastMedian” technique adopted by Pottier et al. in their visualization strategy within the PolSARpro software. Based on this simplified method and the red-green-blue color model, a novel color visualization strategy for three-component model-based polarimetric decomposition is further proposed. The feasibility and validity of the proposed strategy is verified by the measured PolSAR data of Oberpfaffenhofen obtained by DLR L-band E-SAR.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122334664","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}
A transmission line model is generalized to characterize the effect of electromagnetic plane wave coupling with shielded twisted wire pair (TWP)/twinax cables with apertures on their shield. The model is applied in order to predict the response of the shielded TWP/twinax cables by obtaining the induced common-mode (CM) and differential-mode (DM) currents due to external electromagnetic interference. Therefore, the field-to-wire coupling to the outer shield is solved by applying the transmission line model. After that, the transfer impedance and admittance of the shield with line apertures are used to model the coupling from the outer shield to the inner wires. It is shown that the shielded TWP has better performance than the twinax cable in reducing the external interference. The results are validated using the commercial software FEKO, where a good agreement is obtained.
{"title":"Transmission Line Model of Field-to-wire Coupling with Shielded TWP/Twinax Cables with line Apertures","authors":"O. Gassab, Jingxiao Li, Dongdong Wang, Fang He, Q. Zhan, Ruilong Chen, Wen-Yan Yin","doi":"10.1109/piers55526.2022.9793319","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9793319","url":null,"abstract":"A transmission line model is generalized to characterize the effect of electromagnetic plane wave coupling with shielded twisted wire pair (TWP)/twinax cables with apertures on their shield. The model is applied in order to predict the response of the shielded TWP/twinax cables by obtaining the induced common-mode (CM) and differential-mode (DM) currents due to external electromagnetic interference. Therefore, the field-to-wire coupling to the outer shield is solved by applying the transmission line model. After that, the transfer impedance and admittance of the shield with line apertures are used to model the coupling from the outer shield to the inner wires. It is shown that the shielded TWP has better performance than the twinax cable in reducing the external interference. The results are validated using the commercial software FEKO, where a good agreement is obtained.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127078652","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 : 2022-04-25DOI: 10.1109/piers55526.2022.9792953
Minmin Huang, Shuanggen Jin, Xueqin Gao
Flood disaster is one of the natural disasters with the highest frequency in the Yangtze River, which caused immeasurable losses, particularly catastrophic floods in the Yangtze River Basin during July and August 2020. Nowadays, Synthetic aperture radar (SAR) imagery can monitor and evaluate floods in any weather conditions. In this paper, the spatial-temporal variations of the 2020 catastrophic flood are investigated and evaluated from Sentinel-1 date and Otsu thresholding method in the two perspectives of area disparity and flood duration. Four severe flood sections of the Yangtze River (Yueyang, Hankou, Jiujiang, Chizhou) are taken as study objects. Yueyang and Hankou sections are in the middle reach and the Jiujiang and Chizhou section are in the lower section. The results show that the average water body area in 2020 was 20.40% larger than that in 2019 in four sections of the Yangtze River. The upper sections are suffered more from floods for a longer time. The water area of four sections shows a highly positive correlation with the water level, which is the highest in Jiujiang Section, even to 0.9924. The four sections are affected by the flood events in 2020 with the order as follows: Yueyang section > Jiujiang section > Hankou section > Chizhou section.
{"title":"Mapping and Evaluation of the 2020 Catastrophic Floods in the Yangtze River Basin Using Sentinel-1 Imagery","authors":"Minmin Huang, Shuanggen Jin, Xueqin Gao","doi":"10.1109/piers55526.2022.9792953","DOIUrl":"https://doi.org/10.1109/piers55526.2022.9792953","url":null,"abstract":"Flood disaster is one of the natural disasters with the highest frequency in the Yangtze River, which caused immeasurable losses, particularly catastrophic floods in the Yangtze River Basin during July and August 2020. Nowadays, Synthetic aperture radar (SAR) imagery can monitor and evaluate floods in any weather conditions. In this paper, the spatial-temporal variations of the 2020 catastrophic flood are investigated and evaluated from Sentinel-1 date and Otsu thresholding method in the two perspectives of area disparity and flood duration. Four severe flood sections of the Yangtze River (Yueyang, Hankou, Jiujiang, Chizhou) are taken as study objects. Yueyang and Hankou sections are in the middle reach and the Jiujiang and Chizhou section are in the lower section. The results show that the average water body area in 2020 was 20.40% larger than that in 2019 in four sections of the Yangtze River. The upper sections are suffered more from floods for a longer time. The water area of four sections shows a highly positive correlation with the water level, which is the highest in Jiujiang Section, even to 0.9924. The four sections are affected by the flood events in 2020 with the order as follows: Yueyang section > Jiujiang section > Hankou section > Chizhou section.","PeriodicalId":422383,"journal":{"name":"2022 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125965138","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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