Radio Science最新文献

Automatic segmentation model and parameter extraction algorithm for lightning whistlers

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2024RS007984

Tian Xiang;Moran Liu;Shimin He;Xiang Wang;Chen Zhou

{"title":"Automatic segmentation model and parameter extraction algorithm for lightning whistlers","authors":"Tian Xiang;Moran Liu;Shimin He;Xiang Wang;Chen Zhou","doi":"10.1029/2024RS007984","DOIUrl":"https://doi.org/10.1029/2024RS007984","url":null,"abstract":"Based on the magnetic field data recorded by the ZH-1 electromagnetic satellite, we cerat a training set of 1,300 spectrograms containing the dispersion spectrum of lightning whistlers (LW). The Segment Anything Model (SAM) in the field of image segmentation is trained through the training set to obtain a fine-tuned SAM model that can be used to detect and segment the dispersion spectrum of LW at pixel level. All track regions of LW are effectively separated from other non-lightning whistlers regions in the spectrograms after being segmented by the model. The segmentation effect is excellent and detection accuracy is 96.89%, which is better than the previous segmentation model for LW based on ground station data. Then we apply the traditional image processing methods to extract the dispersion spectrum of LW one by one, and develop an algorithm to automatically extract the physical parameters of each LW. The root mean square error between the automatically extracted dispersion parameter and the manually extracted dispersion parameter is only 0.1654 s\u0000<sup>1/2</sup>\u0000. The model and algorithm studied in this paper are employed to analyze the dispersion of LW received by the ZH-1 satellite over China. It is found that the whistlers dispersion received by satellites during summer in the northern hemisphere and summer in the southern hemisphere shows opposite trends with receiving latitude. Both trends can be explained by the relationship between the dispersion and the length of propagation paths of LW.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"59 11","pages":"1-14"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777717","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

Electromagnetic energy propagation through rock of low loss tangent

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2024RS008076

B. A. Austin

引用次数: 0

Spatial-temporal analysis of inter tropical discontinuity influence on radio signal behavior in Nigeria

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2024RS008006

I. Emmanuel;O. S. Ojo;G. O. Emmanuel;K. D. Adedayo

引用次数: 0

Advanced hybrid optimization algorithms for energy efficient cloud resource allocation

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2024RS008012

M. Suresh Kumar;D. Mansoor Hussain;M. Rohini;S. Oswalt Manoj

{"title":"Advanced hybrid optimization algorithms for energy efficient cloud resource allocation","authors":"M. Suresh Kumar;D. Mansoor Hussain;M. Rohini;S. Oswalt Manoj","doi":"10.1029/2024RS008012","DOIUrl":"https://doi.org/10.1029/2024RS008012","url":null,"abstract":"Cloud computing is highly sought after for its dynamic resource allocation capabilities and pay-per-use model. However, previous research has identified several challenges, such as lower coverage, high integration rates, longer computation times, and complex operators, all of which are associated with NP-hard problems. These issues negatively impact the efficiency of resource allocation and scheduling, leading to slower processes, inefficiencies in multi-objective optimization, lower throughput, and higher power consumption. To address these challenges, we propose a unique Hybridized Optimization Algorithm that integrates Crow Swarm Optimization (CSO), Cuckoo Search Optimization (CSO), and Cat Hunting Optimization (CHO). Initially, Particle Swarm Optimization (PSO) and the Crow Search Algorithm (CSA) handle the exploitation and exploration phases to balance task loads. Subsequently, Cuckoo Search Optimization (CSO) enhances resource utilization and addresses NP-hard issues, while Cat Hunting Optimization (CHO) refines the search from global to local optimal spaces to achieve the best values. The results demonstrate that the proposed hybrid technique effectively reduces user request waiting times, lowers energy consumption, and decreases execution times on cloud servers compared to baseline approaches, thereby significantly improving overall system performance.","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":"142777715","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

Mathematical model of a rectangular double negative meta-structure for 5G applications

IF 1.6 4区地球科学

Radio Science Pub Date : 2024-11-01 DOI: 10.1029/2024RS008036

M. J. Alam;S. I. Latif

{"title":"Mathematical model of a rectangular double negative meta-structure for 5G applications","authors":"M. J. Alam;S. I. Latif","doi":"10.1029/2024RS008036","DOIUrl":"https://doi.org/10.1029/2024RS008036","url":null,"abstract":"This article introduces the mathematical formulation of a proven rectangular double negative (DNZ) metamaterial (MTM) structure using a lumped element circuit model in terms of RLC components for millimeter-wave (mmWave) 28 GHz applications. The structure is developed on a 0.254 mm-thick substrate material: Rogers RT/duroid 5880 with an area of 8.7 mm\u0000<sup>2</sup>\u0000. The model accounts for different losses inherent in the system; a series resistance to take into account the losses in the conductor and a shunt resistance to describe the losses in the dielectric substrate, addressing the finite conductivity of conducting materials, the finite resistivity of the dielectric material, and the presence of a dielectric substrate with metallic rings on top. By incorporating these factors, it is possible to precisely predict the resonance frequency associated with this specific structure, however limits the formulation from being applied to other shapes. Numerical validation demonstrates a good agreement with analytical predictions, affirming the model's reliability. The study provides a robust analytical foundation and numerical validation for the double negative metamaterial unit cell, advancing the mmWave 5G wireless technology field.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"59 11","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777716","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

Front matters

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

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

Pseudo-random code generator design for satellite transponder of 5G wireless networks

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

Modeling and design of improved-gain wideband magneto-electric dipole antenna for micro-BTS applications

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

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