Pub Date : 2024-08-29DOI: 10.1109/JMASS.2024.3451477
Li Zhao;Chuan Qin;Qiuni Li;Chongchong Han;Jialong Jian;Yuanfei Liu
An improved dynamic surface control (IDSC) method is proposed for a class of strict-feedback nonlinear systems with internal uncertainties and external disturbances. First, compared with the typical first-order sliding-mode differentiator, this article presents an improved method to obtain the first-order differential approximation of the virtual control signals, which tackles the obstacle of “explosion of complexity.” Second, to eliminate the effect of filtering errors that exist in traditional dynamic surface control method, in this article, the tracking errors are directly constructed using the virtual control signal. Third, composite disturbances were estimated and compensated by designing a novel disturbance observer, which eliminates the limitations that the disturbance terms must be differentiable or even slow tensors. Finally, to illustrate that the proposed method has a great ability to suppress fast time-varying and nondifferentiable disturbances, the simulation results of a numerical example and a practical example of a modern advanced fighter jet system were presented.
{"title":"Improved Dynamic Surface Control for Uncertain Nonlinear Systems With Application to Fighter Jet System","authors":"Li Zhao;Chuan Qin;Qiuni Li;Chongchong Han;Jialong Jian;Yuanfei Liu","doi":"10.1109/JMASS.2024.3451477","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3451477","url":null,"abstract":"An improved dynamic surface control (IDSC) method is proposed for a class of strict-feedback nonlinear systems with internal uncertainties and external disturbances. First, compared with the typical first-order sliding-mode differentiator, this article presents an improved method to obtain the first-order differential approximation of the virtual control signals, which tackles the obstacle of “explosion of complexity.” Second, to eliminate the effect of filtering errors that exist in traditional dynamic surface control method, in this article, the tracking errors are directly constructed using the virtual control signal. Third, composite disturbances were estimated and compensated by designing a novel disturbance observer, which eliminates the limitations that the disturbance terms must be differentiable or even slow tensors. Finally, to illustrate that the proposed method has a great ability to suppress fast time-varying and nondifferentiable disturbances, the simulation results of a numerical example and a practical example of a modern advanced fighter jet system were presented.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 4","pages":"246-253"},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679334","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 : 2024-08-23DOI: 10.1109/JMASS.2024.3449071
Elisa Robert;Mathieu Barthelemy;Thierry Sequies
The satellites for auroral tomography in space (SATIS) project is a mission concept that proposes to perform auroral tomography from space using imagers placed on a constellation of satellites. Auroral tomography is particularly interesting for reconstructing the flux of particles precipitating into the atmosphere. The advantage of space observations is that they avoid cloud cover problems, allowing larger set of data and with a dedicated ground-based infrastructure ensure quasi-continuous monitoring. However, the main difficulty of this mission is to synchronize orbits and attitudes of the satellites in order to observe the same volume of emission at the same time and from different perspectives. The attitude and determination control system will thus have to be very precise and stable. The data volume is also an issue especially in a monitoring point of view. Furthermore, atmospheric drag will have to be correctly considered to limit orbit disturbances and keep satellites synchronized. We present here the preliminary study of this project and the initial requirements identified to be able to perform this mission concept.
{"title":"The Satellites for Auroral Tomography in Space (SATIS) Project: Tomographic Reconstruction of the Auroral Emissions From Space","authors":"Elisa Robert;Mathieu Barthelemy;Thierry Sequies","doi":"10.1109/JMASS.2024.3449071","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3449071","url":null,"abstract":"The satellites for auroral tomography in space (SATIS) project is a mission concept that proposes to perform auroral tomography from space using imagers placed on a constellation of satellites. Auroral tomography is particularly interesting for reconstructing the flux of particles precipitating into the atmosphere. The advantage of space observations is that they avoid cloud cover problems, allowing larger set of data and with a dedicated ground-based infrastructure ensure quasi-continuous monitoring. However, the main difficulty of this mission is to synchronize orbits and attitudes of the satellites in order to observe the same volume of emission at the same time and from different perspectives. The attitude and determination control system will thus have to be very precise and stable. The data volume is also an issue especially in a monitoring point of view. Furthermore, atmospheric drag will have to be correctly considered to limit orbit disturbances and keep satellites synchronized. We present here the preliminary study of this project and the initial requirements identified to be able to perform this mission concept.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 4","pages":"237-245"},"PeriodicalIF":0.0,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679377","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 : 2024-08-23DOI: 10.1109/JMASS.2024.3448433
Heng Zhang;Zhemin Sun;Chaoqun Yang;Xianghui Cao
Mobile edge computing (MEC) revolutionizes data processing by shifting it from the network core to the edge, significantly reducing latency and ensuring Quality of Service. Integrating the agile and flexible unmanned- aerial-vehicle (UAV) technology with MEC offers new opportunities and challenges in decision making for dynamic and complex environments due to the UAVs’ mobility and Line of Sight advantages. Motivated by the potential of UAV-assisted MEC systems with caching mechanisms, this study addresses the optimization problem under uncertain conditions and user demand. To tackle the complex nonconvex sequential decision problem, a deep reinforcement learning framework named delay hybrid action actor-critic is proposed, possessing the capability to handle scenarios requiring both continuous and discrete actions. Comprehensive simulations are conducted to validate the capability of the proposed framework, demonstrating its superiority over traditional methods.
{"title":"Latency Optimization in UAV-Assisted Mobile Edge Computing Empowered by Caching Mechanisms","authors":"Heng Zhang;Zhemin Sun;Chaoqun Yang;Xianghui Cao","doi":"10.1109/JMASS.2024.3448433","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3448433","url":null,"abstract":"Mobile edge computing (MEC) revolutionizes data processing by shifting it from the network core to the edge, significantly reducing latency and ensuring Quality of Service. Integrating the agile and flexible unmanned- aerial-vehicle (UAV) technology with MEC offers new opportunities and challenges in decision making for dynamic and complex environments due to the UAVs’ mobility and Line of Sight advantages. Motivated by the potential of UAV-assisted MEC systems with caching mechanisms, this study addresses the optimization problem under uncertain conditions and user demand. To tackle the complex nonconvex sequential decision problem, a deep reinforcement learning framework named delay hybrid action actor-critic is proposed, possessing the capability to handle scenarios requiring both continuous and discrete actions. Comprehensive simulations are conducted to validate the capability of the proposed framework, demonstrating its superiority over traditional methods.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 4","pages":"228-236"},"PeriodicalIF":0.0,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679335","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 : 2024-08-22DOI: 10.1109/JMASS.2024.3440776
{"title":"The Journal of Miniaturized Air and Space Systems","authors":"","doi":"10.1109/JMASS.2024.3440776","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3440776","url":null,"abstract":"","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 3","pages":"C2-C2"},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10643755","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142041461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-21DOI: 10.1109/JMASS.2024.3447457
Gazali Bashir;Amit K. Singh;Ankit Dubey
This article introduces a compact wideband beam-switching digital metasurface reflector (MSR) array antenna featuring extreme offset illumination for satellite communications in the Ka band. The MSR comprises phase-modulating subwave length unit cell elements. The unit cell consists of a cross dipole loaded with curved stubs. The arrangement of the stubs across the dipole modulates the phase characteristics of the incident electric field. An MSR composed of $15times 15$ metabits is designed, fabricated, and validated. The metasurface reflectarray is excited by three antipodal Vivaldi antennas with an extreme offset configuration, which effectively mitigates the blockage due to the feeding source. The measured results show highly directive, stable beam-switching characteristics over a broad spectrum ranging from 26 to 32 GHz. A beam steering range of −35° to +35° is obtained along the azimuthal plane, with a maximum measured peak gain of 19.1 dBi at 28.5 GHz and maximum beam-switching loss of 1.5 dBi. A maximum measured aperture efficiency of 35% is obtained, and a 3-dB gain bandwidth of 20.7%.
{"title":"Beam-Switching Digital Metasurface Reflectarray Antenna With Extreme Offset Illumination for Satellite Communications","authors":"Gazali Bashir;Amit K. Singh;Ankit Dubey","doi":"10.1109/JMASS.2024.3447457","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3447457","url":null,"abstract":"This article introduces a compact wideband beam-switching digital metasurface reflector (MSR) array antenna featuring extreme offset illumination for satellite communications in the Ka band. The MSR comprises phase-modulating subwave length unit cell elements. The unit cell consists of a cross dipole loaded with curved stubs. The arrangement of the stubs across the dipole modulates the phase characteristics of the incident electric field. An MSR composed of \u0000<inline-formula> <tex-math>$15times 15$ </tex-math></inline-formula>\u0000 metabits is designed, fabricated, and validated. The metasurface reflectarray is excited by three antipodal Vivaldi antennas with an extreme offset configuration, which effectively mitigates the blockage due to the feeding source. The measured results show highly directive, stable beam-switching characteristics over a broad spectrum ranging from 26 to 32 GHz. A beam steering range of −35° to +35° is obtained along the azimuthal plane, with a maximum measured peak gain of 19.1 dBi at 28.5 GHz and maximum beam-switching loss of 1.5 dBi. A maximum measured aperture efficiency of 35% is obtained, and a 3-dB gain bandwidth of 20.7%.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 4","pages":"221-227"},"PeriodicalIF":0.0,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679337","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 : 2024-08-16DOI: 10.1109/JMASS.2024.3445257
Jiawang Li;Yitong Shi;Lei Xiang
This article presents a novel wide stopband suppression millimeter wave (mmWave) filtering antenna (filtenna). A three-order resonance substrate integrated waveguide (SIW) topology structure, including a driven patch and a radiation patch, is applied to enhance the bandwidth. In contrast to traditional stacked patch antennas, this design modifies the driven and radiation patches in different shapes. The full mode SIW (FMSIW) cavity is adopted due to its high-quality (high-Q) factor, which effectively improves the antenna’s selectivity. Besides, the generation of main upper band radiation nulls is attributed to the designed FMSIW cavity. Four parasitic vertical dumbbell structures are added to increase the stopband bandwidth. A pair of U-shape slots are etched on the driven patch to generate a lower band radiation null. A polycyclic structure rather than a single radiation patch can generate another lower band radiation null. To reduce the effect of the antenna element on the ground area and increase the isolation between elements, a via array is added around it, which also slightly enhances the sideband suppression of the antenna in the upper sideband. For verification, a filtenna working for the N258 band (24.25–27.5 GHz) is designed, fabricated, and measured. The measured results show that a measured −10-dB impedance bandwidth covering from 24.25 to 29.06 GHz is successfully implemented. The average realized gain can reach 5 dBi, and the lower and upper band suppression can reach more than 30 and 19.1 dB, respectively. Furthermore, the upper stopband achieves wide suppression from 30 to 50 GHz. Overall, this filtenna is a competitive candidate for 5G mmWave applications.
{"title":"Compact Wide Upper Stopband Suppression Filtering Antenna for Aerospace Applications","authors":"Jiawang Li;Yitong Shi;Lei Xiang","doi":"10.1109/JMASS.2024.3445257","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3445257","url":null,"abstract":"This article presents a novel wide stopband suppression millimeter wave (mmWave) filtering antenna (filtenna). A three-order resonance substrate integrated waveguide (SIW) topology structure, including a driven patch and a radiation patch, is applied to enhance the bandwidth. In contrast to traditional stacked patch antennas, this design modifies the driven and radiation patches in different shapes. The full mode SIW (FMSIW) cavity is adopted due to its high-quality (high-Q) factor, which effectively improves the antenna’s selectivity. Besides, the generation of main upper band radiation nulls is attributed to the designed FMSIW cavity. Four parasitic vertical dumbbell structures are added to increase the stopband bandwidth. A pair of U-shape slots are etched on the driven patch to generate a lower band radiation null. A polycyclic structure rather than a single radiation patch can generate another lower band radiation null. To reduce the effect of the antenna element on the ground area and increase the isolation between elements, a via array is added around it, which also slightly enhances the sideband suppression of the antenna in the upper sideband. For verification, a filtenna working for the N258 band (24.25–27.5 GHz) is designed, fabricated, and measured. The measured results show that a measured −10-dB impedance bandwidth covering from 24.25 to 29.06 GHz is successfully implemented. The average realized gain can reach 5 dBi, and the lower and upper band suppression can reach more than 30 and 19.1 dB, respectively. Furthermore, the upper stopband achieves wide suppression from 30 to 50 GHz. Overall, this filtenna is a competitive candidate for 5G mmWave applications.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 4","pages":"211-220"},"PeriodicalIF":0.0,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679258","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 : 2024-07-17DOI: 10.1109/JMASS.2024.3429514
Yulong Sun;Guoshen Ding;Yandong Zhao;Renchi Zhang;Wenjun Wang
Due to the increasingly widespread application of unmanned aerial vehicle (UAV), the study of flight conflict resolution can effectively avoid the collision of different UAVs. First, describe flight conflict resolution as an optimization problem. Second, the improved fruit fly optimization algorithm (IFOA) is proposed. The smell concentration judgment is equal to the coordinate instead of the reciprocal of the distance in order to make the variable accessible to be negative and occur with equal probability in the defined domain. Next, introduce the limited number of searches of the Artificial Bee Colony Algorithm to avoid falling into the local optimum. Meanwhile, generate a direction and distance of the fruit fly individual through roulette. Finally, the effectiveness of the algorithm is demonstrated by computational experiments on 18 benchmark functions and the simulation of the flight conflict resolution of two and four UAVs. The results show that compared with the standard fruit fly optimization algorithm, the IFOA has superior global convergence ability and effectively reduces the delay distance, which has important potential in flight conflict resolution.
{"title":"Flight Conflict Resolution Simulation Study Based on the Improved Fruit Fly Optimization Algorithm","authors":"Yulong Sun;Guoshen Ding;Yandong Zhao;Renchi Zhang;Wenjun Wang","doi":"10.1109/JMASS.2024.3429514","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3429514","url":null,"abstract":"Due to the increasingly widespread application of unmanned aerial vehicle (UAV), the study of flight conflict resolution can effectively avoid the collision of different UAVs. First, describe flight conflict resolution as an optimization problem. Second, the improved fruit fly optimization algorithm (IFOA) is proposed. The smell concentration judgment is equal to the coordinate instead of the reciprocal of the distance in order to make the variable accessible to be negative and occur with equal probability in the defined domain. Next, introduce the limited number of searches of the Artificial Bee Colony Algorithm to avoid falling into the local optimum. Meanwhile, generate a direction and distance of the fruit fly individual through roulette. Finally, the effectiveness of the algorithm is demonstrated by computational experiments on 18 benchmark functions and the simulation of the flight conflict resolution of two and four UAVs. The results show that compared with the standard fruit fly optimization algorithm, the IFOA has superior global convergence ability and effectively reduces the delay distance, which has important potential in flight conflict resolution.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 3","pages":"200-209"},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142041376","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 : 2024-04-16DOI: 10.1109/JMASS.2024.3389097
Curtis Manore;Alan J. Fenn;Hanumant Singh
In suboptimal environments for satellite reception, an unmanned aerial system (UAS) can navigate to a higher vantage point to receive better quality satellite broadcasts. Small UAS platforms are constrained by weight and size, making VHF antenna implementation difficult for satellite reception onboard a UAS. This research designs, simulates, and implements a small form factor V-dipole antenna with matching circuit and low-noise amplifiers to receive high-quality National Oceanic and Atmospheric Administration (NOAA) satellite imagery and weather data from a custom DJI Matrice 100 UAS platform. A software-defined radio was used to filter and demodulate VHF satellite signals, and an Nvidia TX2-embedded computer processed the satellite images onboard the UAS. Performance was evaluated by the quality of the image reception and practicality of the antenna design in flight.
在卫星接收不理想的环境中，无人机系统（UAS）可以导航到更高的有利位置，以接收质量更好的卫星广播。小型无人机系统平台受到重量和尺寸的限制，因此很难在无人机系统上实施甚高频天线来接收卫星。本研究设计、模拟并实现了一种小型 V 型偶极子天线，该天线配有匹配电路和低噪声放大器，可从定制的大疆 Matrice 100 无人机系统平台接收高质量的美国国家海洋和大气管理局（NOAA）卫星图像和气象数据。软件定义无线电用于过滤和解调甚高频卫星信号，Nvidia TX2-嵌入式计算机在无人机系统上处理卫星图像。通过图像接收质量和飞行中天线设计的实用性对性能进行了评估。
{"title":"Design of Active V-Dipole Antenna on UAS for Receiving NOAA Polar Satellite Imagery","authors":"Curtis Manore;Alan J. Fenn;Hanumant Singh","doi":"10.1109/JMASS.2024.3389097","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3389097","url":null,"abstract":"In suboptimal environments for satellite reception, an unmanned aerial system (UAS) can navigate to a higher vantage point to receive better quality satellite broadcasts. Small UAS platforms are constrained by weight and size, making VHF antenna implementation difficult for satellite reception onboard a UAS. This research designs, simulates, and implements a small form factor V-dipole antenna with matching circuit and low-noise amplifiers to receive high-quality National Oceanic and Atmospheric Administration (NOAA) satellite imagery and weather data from a custom DJI Matrice 100 UAS platform. A software-defined radio was used to filter and demodulate VHF satellite signals, and an Nvidia TX2-embedded computer processed the satellite images onboard the UAS. Performance was evaluated by the quality of the image reception and practicality of the antenna design in flight.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 3","pages":"165-174"},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142041372","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 : 2024-04-04DOI: 10.1109/JMASS.2024.3385699
Suchitra Tiwari;Amit K. Singh;Ankit Dubey
A highly efficient low-profile binary metasurface lens (BMSL) antenna is designed and developed to achieve wide-angle beamsteering at the millimeter-wave band of fifth-generation (5G) aerospace communication systems. First, a subwavelength-sized phase-shift element (meta-element) with a crossed-arrow geometry having two-line symmetry structure is designed possessing special characteristics of insensitivity to polarization as well as the oblique angle of incidence, wide-band transmission, and compactness. Further, 1-bit quantized radial phase-graded metasurface lens is designed by arranging the proposed elements in $19times19$ array resulting in an aperture area of $33.6~lambda _{0}^{2}$ . To realize beamsteering along 0°, ±15°, ±30°, ±45°, and ±60°, BMSLs with distinct phase-quantization are designed and spatially fed through antipodal Vivaldi antenna (AVA) which acts as a primary feed source positioned at optimum focal point thereby radiating highly concentrated beams in the intended directions. The complete BMSL antenna system is then fabricated and characterized in an ideal free-space environment achieving a measured peak gain of up to 20.8 dBi in broadside direction and 1.6 dB of maximum scan loss for ±60° steering. The proposed BMSL antenna achieves an aperture efficiency of 28.4 % at 28 GHz and a −3-dB gain bandwidth of 16.5 %. Thus, the proposed BMSL antenna is a promising contender for facilitating terrestrial (air) as well as nonterrestrial (space) communication links between low-Earth orbit satellites and 5G base stations.
{"title":"Wide-Band Wide-Angle Beamsteerable Meta-Lens Antenna for Terrestrial/Nonterrestrial 5G Communication Systems","authors":"Suchitra Tiwari;Amit K. Singh;Ankit Dubey","doi":"10.1109/JMASS.2024.3385699","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3385699","url":null,"abstract":"A highly efficient low-profile binary metasurface lens (BMSL) antenna is designed and developed to achieve wide-angle beamsteering at the millimeter-wave band of fifth-generation (5G) aerospace communication systems. First, a subwavelength-sized phase-shift element (meta-element) with a crossed-arrow geometry having two-line symmetry structure is designed possessing special characteristics of insensitivity to polarization as well as the oblique angle of incidence, wide-band transmission, and compactness. Further, 1-bit quantized radial phase-graded metasurface lens is designed by arranging the proposed elements in \u0000<inline-formula> <tex-math>$19times19$ </tex-math></inline-formula>\u0000 array resulting in an aperture area of \u0000<inline-formula> <tex-math>$33.6~lambda _{0}^{2}$ </tex-math></inline-formula>\u0000. To realize beamsteering along 0°, ±15°, ±30°, ±45°, and ±60°, BMSLs with distinct phase-quantization are designed and spatially fed through antipodal Vivaldi antenna (AVA) which acts as a primary feed source positioned at optimum focal point thereby radiating highly concentrated beams in the intended directions. The complete BMSL antenna system is then fabricated and characterized in an ideal free-space environment achieving a measured peak gain of up to 20.8 dBi in broadside direction and 1.6 dB of maximum scan loss for ±60° steering. The proposed BMSL antenna achieves an aperture efficiency of 28.4 % at 28 GHz and a −3-dB gain bandwidth of 16.5 %. Thus, the proposed BMSL antenna is a promising contender for facilitating terrestrial (air) as well as nonterrestrial (space) communication links between low-Earth orbit satellites and 5G base stations.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 2","pages":"117-124"},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141091131","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}
Multibaseline phase unwrapping (MBPU) is a key procedure of interferometric synthetic aperture radar (InSAR). However, phase noise is a factor still challenging the MBPU accuracy. This article presents a refined pure integer programming (RPIP)-based MBPU method. In this method, a new parameter is introduced through considering the statistical information of the interferometric phase, which is adopted to improve the tolerance of phase noise. We also provide an effective path for searching of the ambiguity set. Theoretical analysis and experimental results show that, compared with the PIP method, unwrapping errors of the RPIP method is reduced by 60%.
{"title":"Multibaseline Phase Unwrapping With a Refined Parametric Pure Integer Programming for Noise Suppression","authors":"Jiawei Yue;Qihuan Huang;Hui Liu;Ziqi He;Hanwen Zhang","doi":"10.1109/JMASS.2024.3385026","DOIUrl":"https://doi.org/10.1109/JMASS.2024.3385026","url":null,"abstract":"Multibaseline phase unwrapping (MBPU) is a key procedure of interferometric synthetic aperture radar (InSAR). However, phase noise is a factor still challenging the MBPU accuracy. This article presents a refined pure integer programming (RPIP)-based MBPU method. In this method, a new parameter is introduced through considering the statistical information of the interferometric phase, which is adopted to improve the tolerance of phase noise. We also provide an effective path for searching of the ambiguity set. Theoretical analysis and experimental results show that, compared with the PIP method, unwrapping errors of the RPIP method is reduced by 60%.","PeriodicalId":100624,"journal":{"name":"IEEE Journal on Miniaturization for Air and Space Systems","volume":"5 3","pages":"156-164"},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10492469","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142041439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：