Radio Science最新文献_第3页

Front matters 前面问题

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1002/rds.21247

引用次数: 0

Effects of tropospheric turbulence on radio signal data passing atmospheric communication links 对流层湍流对通过大气通信链路的无线电信号数据的影响

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2023RS007895

I. Bronfman;Y. Ben-Shimol;N. Blaunstein

引用次数: 0

Modeling and design of improved-gain wideband magneto-electric dipole antenna for micro-BTS applications 微bts应用中改进增益宽带磁电偶极子天线的建模与设计

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2024RS008037

Zhale Amiri;Keivan Kaboutari;Changiz Ghobadi;Javad Nourinia;Majid Shokri;Stanislav Maslovski

{"title":"Modeling and design of improved-gain wideband magneto-electric dipole antenna for micro-BTS applications","authors":"Zhale Amiri;Keivan Kaboutari;Changiz Ghobadi;Javad Nourinia;Majid Shokri;Stanislav Maslovski","doi":"10.1029/2024RS008037","DOIUrl":"https://doi.org/10.1029/2024RS008037","url":null,"abstract":"A wideband Magneto-Electric Dipole (MED) antenna with high gain is proposed for the 700/800/850/900 MHz frequency bands for cellular network applications. The antenna comprises a half-wavelength bow-tie-shaped dipole, an elongated magnetic loop and a ground reflector with four Elevated Ground Planes (EGPs) at reflector's corners. The EGPs enhance the antenna gain and Front-to-Back Ratio (FBR), which is a promising technique in the MED antenna design. The antenna is excited by a Γ-shaped coupling element. An analytical model of the proposed antenna is developed by employing Schelkunoff's model for dipole antennas and the transmission line theory complemented by radiation resistance corrections. The antenna design is validated with full-wave numerical simulations. The antenna is fabricated using cut and bent metallic plates and tested in an anechoic chamber. The analytical, numerical and experimental results are in a good agreement. The experimental results confirm that the proposed MED antenna with dimensions of 1.44λ × 1.44λ × 0.27λ achieves a bandwidth of 61.53% (623.1–1176.8 MHz) for VSWR < 1.5 and a stable gain of 9.8 ± 1.9 dBi. By employing the EGPs, the realized peak gain and FBR are enhanced by 0.52 dBi and 1.1 dB, respectively.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"59 11","pages":"1-13"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pseudo-random code generator design for satellite transponder of 5G wireless networks 5G无线网络卫星转发器伪随机码发生器设计

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2024RS008002

Ravandran Muttiah

{"title":"Pseudo-random code generator design for satellite transponder of 5G wireless networks","authors":"Ravandran Muttiah","doi":"10.1029/2024RS008002","DOIUrl":"https://doi.org/10.1029/2024RS008002","url":null,"abstract":"In satellite communication systems, a data stream for a direct sequence spread spectrum transmitter is multiplied by a pseudo-random code. It can then be transmitted over the same microwave channel as multiple users. Correlating the received composite signal with the provided pseudo-random code at the receiver end will extract the original data stream without interference. The proposed transponder models here are to achieve the objective of minimizing the satellite onboard components, increasing the speed of operations for higher bandwidth, and transmitting more information to a large group of users. However, taking advantage of this technology and overcoming the challenges of implementing it in a real-time environment, a satellite transponder was designed at a speed of 128 bps. The satellite transponder here is to accommodate satellites interconnecting 5G wireless networking systems. This paper describes the useful roles of pseudo-random code generations and the methods of applications to track the desired binary data bit sequences according to the preferred carrier frequency channels. The designed transponder schematic circuit was tested for the received uplink signal at the carrier frequency 13 GHz and transmit downlink signal at 11 GHz. To evaluate the designed onboard transmitter system performance, initially, the system was analyzed in terms of energy per bit-to-noise power spectral density ratio, bit error rate, and finally signal-to-noise power ratio. The design system was measured for the operations with minimum bandwidth of 100 MHz upto 1.28 GHz for the input bit rates of 200 Mbps upto 2.56 Gbps respectively.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"59 11","pages":"1-20"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of slitted parallel-plate waveguides using the method of kobayashi potential 利用小林电位法分析狭缝平行板波导

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-10-01 DOI: 10.1029/2024RS007990

B. Honarbakhsh

引用次数: 0

Landmine detection using electromagnetic time reversal-based methods: 2. performance analysis of TR-MUSIC 利用基于电磁时间反转的方法探测地雷：2. TR-MUSIC 的性能分析

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-10-01 DOI: 10.1029/2024RS007972

Hamidreza Karami;André Koch;Carlos Romero;Marcos Rubinstein;Farhad Rachidi

{"title":"Landmine detection using electromagnetic time reversal-based methods: 2. performance analysis of TR-MUSIC","authors":"Hamidreza Karami;André Koch;Carlos Romero;Marcos Rubinstein;Farhad Rachidi","doi":"10.1029/2024RS007972","DOIUrl":"https://doi.org/10.1029/2024RS007972","url":null,"abstract":"In this paper, a series of numerical simulations are conducted for various 2D and 3D configurations to demonstrate the performance of the Time Reversal Multiple Signal Classification (TR-MUSIC) method. The results reveal the excellent performance of TR-MUSIC, taking into account the effects of noise, soil types (both homogeneous and layered), and their electrical parameters, as well as different types of targets (varying in number, size, shape, and location). Additionally, unlike other electromagnetic TR-based techniques, TR-MUSIC offers very high resolution (on the order of 1/10 or higher) with a reasonable number of sensors, enabling the detection of multiple closely spaced targets. In TR-based methods, reflections from the object(s) or landmine(s) are crucial and are determined by the difference between the constitutive parameters (e.g., permittivity, permeability, and conductivity) of the landmine(s) and their surrounding medium. Therefore, TR-based approaches, similar to conventional GPR-based approaches, are suitable for detecting objects or landmines with significant differences in constitutive parameters compared to their immersion medium. This research primarily focuses on metallic objects or landmines.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"59 10","pages":"1-14"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automatic extraction of VLF constant-frequency electromagnetic wave frequency based on an improved Vgg16-Unet 基于改进型 Vgg16-Unet 的 VLF 恒频电磁波频率自动提取系统

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-10-01 DOI: 10.1029/2024RS008019

Ying Han;Qingjie Liu;Jianping Huang;Zhong Li;Rui Yan;Jing Yuan;Xuhui Shen;Lili Xing;Guoli Pang

{"title":"Automatic extraction of VLF constant-frequency electromagnetic wave frequency based on an improved Vgg16-Unet","authors":"Ying Han;Qingjie Liu;Jianping Huang;Zhong Li;Rui Yan;Jing Yuan;Xuhui Shen;Lili Xing;Guoli Pang","doi":"10.1029/2024RS008019","DOIUrl":"https://doi.org/10.1029/2024RS008019","url":null,"abstract":"Constant Frequency Electromagnetic Waves (CFEWs) refer to electromagnetic waves with a constant frequency. Man-made CFEWs are mainly used in wireless communication, scientific research, global navigation and positioning systems, and military radar. CFEWs exhibit horizontal line characteristics higher than the background on spectrograms. In this study, we focus on Very Low Frequency (VLF) waveform data and power spectral data collected by the China Seismo-Electromagnetic Satellite (CSES) Electromagnetic Field Detector (EFD). We utilize deep learning techniques to construct an improved Vgg16-Unet model for automatically detecting horizontal lines on time-frequency spectrogram and extracting their frequencies. First, we transform waveform data into time-frequency spectrogram with a duration of 2 s using Short-Time Fourier Transform. Then, we manually label horizontal lines on the time-frequency spectrogram using the Labelme tool to establish the dataset. Next, we establish and improve the Vgg16-Unet deep learning model. Finally, we train and test the model using the dataset. Statistical experimental results show that the error rate of line detection is 0, indicating high reliability of the model, with fewer parameters and fast computation speed suitable for practical applications. Not only do we detect lines through the model, but we also obtain their frequencies. Additionally, in batch-generated power spectrogram of CFEWs, we discover some unstable phenomena such as frequency shifts and fluctuations, which contribute to understanding the propagation mechanism of CFEWs in the ionosphere and improving the accuracy of related systems.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"59 10","pages":"1-14"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Realizing orthogonal modes in compact cavity-backed dual-polarized antenna through simple feeding structures for millimeter-wave AiP applications 通过用于毫米波 AiP 应用的简单馈电结构，在紧凑型腔背双极化天线中实现正交模式

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-10-01 DOI: 10.1029/2024RS008042

Tzu-Ming Huang;Yi-Cheng Lin

引用次数: 0

Channel estimation for deep space communications under the effect of solar scintillation 太阳闪烁影响下的深空通信信道估计

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-10-01 DOI: 10.1029/2024RS008038

Guanjun Xu;Lianning Cai;Xianqiang Li;Yanli Shao;Zhaohui Song

引用次数: 0

An assessment of HF radio wave propagation in antarctica for a radio link between McMurdo and south pole station 南极洲高频无线电波传播评估，用于麦克默多和南极站之间的无线电链路

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-10-01 DOI: 10.1029/2022RS007632

B. Liu;G. W. Perry;A. T. Chartier

{"title":"An assessment of HF radio wave propagation in antarctica for a radio link between McMurdo and south pole station","authors":"B. Liu;G. W. Perry;A. T. Chartier","doi":"10.1029/2022RS007632","DOIUrl":"https://doi.org/10.1029/2022RS007632","url":null,"abstract":"In this work, we analyze data collected by an HF transmitter/receiver radio link, operating as an oblique ionosonde between the McMurdo Station (transmitter) and South Pole Station (receiver) at 4.1, 5.1, 6.0, 6.4, and 7.2 MHz between 28 February and 14 March 2019. To help contextualize the link's data we have performed numerical raytrace simulations to help understand the observations. By considering both the data and simulations, we have identified both single- and two-hop E- and F-region propagation modes in the data, where the multi-hop modes were observed in the hours around sunrise and sunset in the 4.1 and 5.1 MHz channels. This is an unexpected result given the accepted wisdom that multi-hop modes, which require a ground scatter component, cannot be supported in Antarctica because of the highly absorptive ice covering much of the continent. Our results show that multi-hop propagation modes can be supported in the region under specific ionospheric conditions—around sunrise and sunset—if the mode's ground scatter component is collocated with the Transantarctic Mountains. The mountains are located along the great-circle path between the link's transmitter and receiver. However, the combination of favorable ionospheric and ground scattering conditions makes the detection of the multi-hop mode a rare occurrence in the data set analyzed here. These findings are critical to data analysis efforts of any current or future oblique ionosonde systems operating in Antarctica and other regions such as the Arctic.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"59 10","pages":"1-17"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0