Advances in Radio Science最新文献_第3页

Comparison of S-Parameter Measurement Methods for Adapters 适配器s参数测量方法的比较

IF 0.4

Advances in Radio Science Pub Date : 2023-03-21 DOI: 10.5194/ars-20-1-2023

K. Kuhlmann, Frauke K. H. Gellersen, Meike Tschauder

引用次数: 0

Measurement and transformation of continuously modulated fields using a short-time measurement approach 用短时测量方法测量和变换连续调制场

IF 0.4

Advances in Radio Science Pub Date : 2023-03-21 DOI: 10.5194/ars-20-9-2023

F. Faul, Jana Daubmeier, T. Eibert

{"title":"Measurement and transformation of continuously modulated fields using a short-time measurement approach","authors":"F. Faul, Jana Daubmeier, T. Eibert","doi":"10.5194/ars-20-9-2023","DOIUrl":"https://doi.org/10.5194/ars-20-9-2023","url":null,"abstract":"Abstract. Near-field measurements, which are performed in-situ, may suffer from the fact that the antenna under test (AUT) cannot be accessed to transmit or receive a specifically tailored test signal. In some scenarios, it might also be desired to test the AUT during its real operation state, especially when it comes to the verification of antenna systems. Therefore, the need to handle time- and space-modulated fields in combination with a time-harmonic near-field to far-field transformation (NFFFT) arises. For the case where unmanned aerial vehicles (UAVs) carry the field probe in in-situ measurement scenarios, long observation times, required for the resolution of the frequency spectra of modulated fields, are detrimental due to the UAV movement resulting in blurred measurement positions. The short-time measurement (STM) approach, presented in this article, offers a way to transform the measured field data using a time-harmonic NFFFT with short observation times for the collection of the individual field samples.\u0000Measurements are shown which demonstrate the applicability of the STM approach for the measurement and transformation of continuously time-modulated fields in different measurement scenarios.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48414468","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}

引用次数: 1

Pulse shaping of the electromagnetic radiation from a narrow slot antenna 窄缝天线电磁辐射的脉冲整形

IF 0.4

Advances in Radio Science Pub Date : 2023-03-21 DOI: 10.5194/ars-20-113-2023

M. Štumpf, I. Lager

引用次数: 0

Towards Differential Static Magnetic Localization of Commercial Capsule Endoscopes: An Evaluation Using Different Ring and Cylindrical Magnets 商用胶囊内窥镜静态磁定位的差异化：不同环形和圆柱形磁体的评价

IF 0.4

Advances in Radio Science Pub Date : 2023-03-21 DOI: 10.5194/ars-20-105-2023

S. Zeising, Lu Chen, A. Thalmayer, Georg Fischer, J. Kirchner

{"title":"Towards Differential Static Magnetic Localization of Commercial Capsule Endoscopes: An Evaluation Using Different Ring and Cylindrical Magnets","authors":"S. Zeising, Lu Chen, A. Thalmayer, Georg Fischer, J. Kirchner","doi":"10.5194/ars-20-105-2023","DOIUrl":"https://doi.org/10.5194/ars-20-105-2023","url":null,"abstract":"Abstract. Capsule endoscopy is a promising diagnostic tool for the entire gastrointestinal tract. Since a patient swallows the capsules, their size must be sufficiently small. The principal built-in components are cameras, silver-oxide batteries, light emitting diodes, and an antenna for transmitting the video. For diagnosis and treatment, the precise localization of the capsules for specific video frames is required. Recently, static magnetic localization of these capsules with an integrated permanent magnet showed promising results. However, in the state-of-the-art, relatively large magnets compared to the small capsules were used. Therefore, in this extended paper, the localization performance of a recently proposed optimized differential static magnetic localization method for different sized disc and ring magnets was evaluated. The ring magnets were designed for integration with the two batteries of commercial capsules. The magnets were evaluated in static and dynamic scenarios to evaluate the performance of the method in a patient's daily life. It was revealed that the mean position and orientation errors did not exceed 5 mm and 4∘, respectively, for all applied magnets except for the 1.5 and 3 mm long disc magnets. Moreover, the results indicated that the ferromagnetic batteries of capsule endoscopes increase the localization performance when they are centered within a diametrical ring magnet. Overall, it was revealed that the localization performance of the optimized differential method is significantly better than the state-of-the-art even when the magnet volume is significantly reduced compared to previous work. Therefore, it was concluded that 5 mm long disc magnet or a ring magnet are excellent candidates for integration into a commercial capsule for magnetic localization and yield the advantage of being passive magnetic sources.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49523870","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}

引用次数: 0

Susceptibility of Commercial-Off-The-Shelf Sensors to IEMI using Pulse Modulated Signals 使用脉冲调制信号的商用现成传感器对IEMI的敏感性

IF 0.4

Advances in Radio Science Pub Date : 2023-03-21 DOI: 10.5194/ars-20-37-2023

Louis Cesbron Lavau, M. Suhrke, P. Knott

引用次数: 1

Towards Steering Magnetic Nanoparticles in Drug Targeting Using a Linear Halbach Array 利用线性Halbach阵列引导磁性纳米颗粒靶向药物

IF 0.4

Advances in Radio Science Pub Date : 2023-03-21 DOI: 10.5194/ars-20-93-2023

A. Thalmayer, S. Zeising, Maximilian Lübke, Georg Fischer

{"title":"Towards Steering Magnetic Nanoparticles in Drug Targeting Using a Linear Halbach Array","authors":"A. Thalmayer, S. Zeising, Maximilian Lübke, Georg Fischer","doi":"10.5194/ars-20-93-2023","DOIUrl":"https://doi.org/10.5194/ars-20-93-2023","url":null,"abstract":"Abstract. Magnetic nanoparticles offer numerous promising biomedical applications, e.g. magnetic drug targeting. Here, magnetic drug carriers inside the human body are directed towards tumorous tissue by an external magnetic field. However, the success of the treatment strongly depends on the amount of drug carriers, reaching the desired tumor region. This steering process is still an open research topic.\u0000In this paper, the previous study of a linear Halbach array is extended by an additional Halbach array with different magnetization angles between two adjacent magnets and investigated numerically using COMSOL Multiphysics.\u0000The Halbach arrays are arranged with permanent magnets and generate a relatively large region of a moderately homogeneous, high magnetic field while having a strong gradient.\u0000This results in a strong magnetic force, trapping many particles at the magnets. Afterwards, to avoid particle agglomeration, the Halbach array is flipped to its weak side. Therefore, the magnetic flux density, its gradient and the resulting magnetic force are computed for the different Halbach arrays with different constellations of magnetization directions.\u0000Since the calculation of the gradient can lead to high errors due to the used mesh in Comsol, the gradient was derived analytically by investigating two different fitting functions.\u0000Overall, the array with a 90∘ shifted magnetization performs best, changing the magnetic sides of the array easily and deflecting more particles.\u0000Besides, the results revealed that the magnetic force dominates directly underneath the magnets compared to the other existing forces on the SPIONS.\u0000Summarized, the results depict that the magnetic force and, thus, the region where the particles are able to get washed out, can be adjusted using low-cost permanent magnets.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46260482","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}

引用次数: 2

Processing of weather radar raw IQ-data towards the identification and correction of wind turbine interference – Project RIWER: Removing the Influence of Wind Park Echoes in Weather Radar Measurements 气象雷达原始iq数据的处理对风力机干扰的识别和校正——RIWER项目:消除风园回波对气象雷达测量的影响

Advances in Radio Science Pub Date : 2023-03-21 DOI: 10.5194/ars-20-67-2023

Bhavinkumar Vishnubhai Patel, Emre Colak, Aastha Vyas, Madhu Chandra, Ralf Zichner

{"title":"Processing of weather radar raw IQ-data towards the identification and correction of wind turbine interference – Project RIWER: Removing the Influence of Wind Park Echoes in Weather Radar Measurements","authors":"Bhavinkumar Vishnubhai Patel, Emre Colak, Aastha Vyas, Madhu Chandra, Ralf Zichner","doi":"10.5194/ars-20-67-2023","DOIUrl":"https://doi.org/10.5194/ars-20-67-2023","url":null,"abstract":"Abstract. In recent years, the fast construction, expansion and repowering of wind parks have been a major source of concern for the weather radar community and meteorological services. Among others because wind turbines are extremely tall, reflective, and moving objects, which make them a source of interference that is hard to distinguish from meteorological echoes and therefore difficult to filter and even more difficult to correct. Polarimetric C-Band Doppler weather radar measurements enable us to analyse and understand the impact of wind turbine interference on meteorological weather radar echoes and to build up knowledge. The main idea is to analyse the raw IQ-data in order to quantify the behaviour of wind turbine interference with meteorological scattering. As a first step in this direction, this paper will focus on the derivation and analysis of radar moments such as Reflectivity (Z), Differential Reflectivity (ZDR), Differential Propagation Phase (PHIDP), Mean Doppler Velocity (V), and Correlation Coefficient (RHOHV). We will consider two cases: (i) events with precipitation, and (ii) events without precipitation, in order to understand and model the impact of wind turbine interference (WTI). For this purpose, weather radar measurements from Deutscher Wetterdienst (DWD), recorded under the aegis of the project RIWER (Removing the Influence of Wind Park Echoes in Weather Radar Measurements), are presented, analysed and discussed in detail.","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136339115","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}

引用次数: 0

Human RF Electromagnetic Exposure to V2X-Communication 人体射频电磁暴露于v2x通信

IF 0.4

Advances in Radio Science Pub Date : 2022-09-15 DOI: 10.5194/ars-19-233-2022

Lisa-Marie Schilling, C. Bornkessel, M. Hein

{"title":"Human RF Electromagnetic Exposure to V2X-Communication","authors":"Lisa-Marie Schilling, C. Bornkessel, M. Hein","doi":"10.5194/ars-19-233-2022","DOIUrl":"https://doi.org/10.5194/ars-19-233-2022","url":null,"abstract":"Abstract. In the era of automated and connected driving, more and\u0000more cars will be equipped with wireless transmission technologies such as\u0000mobile communications 4G (LTE) and 5G, WiFi, Bluetooth, and V2X. For the\u0000technical implementation of V2X-communications, different standards like\u0000cellular-V2X from the cooperation 3rd Generation Partnership Project and\u0000ITS-G5, based on the WiFi standard 802.11p from the Institute of Electrical\u0000and Electronics Engineers, are under consideration. The electromagnetic\u0000environment of cars and the corresponding exposure of the general public to\u0000wireless emission will be significantly influenced by new radio\u0000technologies. Under all circumstances, it must be ensured that the exposure\u0000of the electromagnetic fields inside a car does not cause any harmful\u0000effects on humans. In order to quantitatively assess the resulting exposure, the generated exposure must be correctly recorded and evaluated according to\u0000their specific time-frequency spectra. This paper describes a new\u0000measurement procedure suitable for the V2X-standard ITS-G5 together with\u0000various exposure measurements performed in different cars with WiFi,\u0000Bluetooth and ITS-G5. In comparison of all wireless standards studied here,\u0000the V2X-service generated the highest electric field strengths inside a car,\u0000when a transmitting di-patch antenna was mounted on the windscreen inside\u0000the driver's cabin. The maximum fraction of the corresponding ICNIRP\u0000reference level amounted to 15.1 %. We conclude that the total exposure\u0000of wireless on-board automotive devices will be dominated by ITS-G5, if the\u0000transmitting antenna is located inside the passenger cabin. As\u0000V2X-communications will increasingly penetrate road traffic, the resulting\u0000exposure should be carefully monitored, in order not to exceed the\u0000corresponding reference levels for general public.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46978192","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}

引用次数: 0

Far- and Near Range Measurements with a Synthetic Aperture Radar for Educational Purposes and Comparison of Two Different Signal Processing Algorithms 用于教育目的的合成孔径雷达的远距离和近距离测量以及两种不同信号处理算法的比较

IF 0.4

Advances in Radio Science Pub Date : 2022-02-21 DOI: 10.5194/ars-19-221-2022

Jonas Berg, Simon Müller, A. Diewald

{"title":"Far- and Near Range Measurements with a Synthetic Aperture Radar for Educational Purposes and Comparison of Two Different Signal Processing Algorithms","authors":"Jonas Berg, Simon Müller, A. Diewald","doi":"10.5194/ars-19-221-2022","DOIUrl":"https://doi.org/10.5194/ars-19-221-2022","url":null,"abstract":"Abstract. In this paper two simple synthetic aperture radar (SAR) methods are applied on data from a 24 GHz FMCW radar implemented on a linear drive for educational purposes.\u0000The data of near and far range measurements are evaluated using two different SAR signal processing algorithms featuring 2D-FFT and frequency back projection (FBP) method (Moreira et al., 2013).\u0000A comparison of these two algorithms is performed concerning runtime, image pixel size, azimuth and range resolution.\u0000The far range measurements are executed in a range of 60 to 135 m by monitoring cars in a parking lot.\u0000The near range measurement from 0 to 5 m are realised in a measuring chamber equipped with absorber foam and nearly ideal targets like corner reflectors.\u0000The comparison of 2D-FFT and FBP algorithm shows that both deliver good and similar results for the far range measurements but the runtime of the FBP algorithm is up to 150 times longer as the 2D-FFT runtime.\u0000In the near range measurements the FBP algorithm displays a very good azimuth resolution and targets which are very close to each other can be separated easily.\u0000In contrast to that the 2D-FFT algorithm has a lower azimuth resolution in the near range, thus targets which are very close to each other, merge together and cannot be separated.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46478325","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}

引用次数: 0

Measurement and optimization of a continuously tunable 10×10 reflectarray antenna for 5G metrology in the K-band 用于5G k波段测量的连续可调谐10×10反射天线的测量和优化

IF 0.4

Advances in Radio Science Pub Date : 2022-01-17 DOI: 10.5194/ars-19-215-2022

T. Harz, T. Kleine-Ostmann

引用次数: 0