Advances in Radio Science最新文献_第4页

A 10 kHz to 6 GHz Low-Cost Vector Network Analyzer 10khz至6ghz低成本矢量网络分析仪

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-17-2021

Andreas Depold, S. Erhardt, R. Weigel, F. Lurz

引用次数: 0

A novel Technique for Improving the Angular Accuracy of Doppler VOR Receivers 一种提高多普勒VOR接收机角精度的新技术

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-1-2021

Karsten Schubert, Jens Werner, J. Wellhausen

{"title":"A novel Technique for Improving the Angular Accuracy of Doppler VOR Receivers","authors":"Karsten Schubert, Jens Werner, J. Wellhausen","doi":"10.5194/ars-19-1-2021","DOIUrl":"https://doi.org/10.5194/ars-19-1-2021","url":null,"abstract":"Abstract. Doppler VOR (D-VOR) transmitters are used as navigation aids in aviation. They transmit an omnidirectional phase reference in an amplitude-modulated (AM) sideband and directional phase information on a frequency-modulated (FM) subcarrier. In an airborne D-VOR navigation receiver, a directional information (azimuth angle) related to the position of the aircraft and the location of the transmitter can be derived from the difference of these two phase signals.\u0000In this work, the accuracy of AM and FM phase signals is firstly investigated analytically and afterwards verified by measurements.\u0000It will be shown that in established procedures, phase inaccuracy is dominated by the AM signal, since the FM signal is about 21 dB less noisy.\u0000Subsequently, a novel method is presented that improves the accuracy of the azimuth angle by orders of magnitude in case of D-VOR transmitters. This new method inherently reduces noise of the AM phase and thus yields a significant increase in accuracy. As a result, the remaining FM phase uncertainty becomes dominant for the total uncertainty of the bearing indication.\u0000Finally, the application of the new method to real measured signals confirms the theoretical expectations.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47419826","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

Compact Radar Cross-Section Measurement Setup and Performance Evaluation 紧凑型雷达截面测量装置及性能评估

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-147-2021

Maximilian F. Sundermeier, Dirk Fischer

{"title":"Compact Radar Cross-Section Measurement Setup and Performance Evaluation","authors":"Maximilian F. Sundermeier, Dirk Fischer","doi":"10.5194/ars-19-147-2021","DOIUrl":"https://doi.org/10.5194/ars-19-147-2021","url":null,"abstract":"Abstract. Radar cross-section measurements require the background reflections to be much lower than the reflections of the device under test. Although, anechoic chambers with special target holders meet this requirement, they are expensive and still have imperfections. To further reduce background reflections or to measure in environments where an anechoic chamber is not suitable, digital signal processing can be used to reduce background reflections. In this paper, a complete signal processing chain realized in Matlab is proposed, involving time gating of the measured target response and a background subtraction technique. Furthermore, the proposed signal processing includes a calibration procedure with either a single known calibration target or multiple known targets to improve measurement uncertainties. A compact measurement setup, consisting of a vector network analyzer and two horn antennas, is used to evaluate the overall performance and the advantages of a multiple known target calibration in a practical manner. The calibrated setup is able to measure the radar cross-section in a frequency range from 2 to 12 GHz with a mean error of less than 0.2 dB for both, VV and HH polarization combinations. It could also be shown, that a multi target calibration can result in an improvement of the measurement uncertainty by about 2.5 %.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47477271","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

Road Surface Characteristics for the Automotive 77 GHz Band 汽车77 GHz频段的路面特性

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-165-2021

Vera Kurz, Hannes Stuelzebach, F. Pfeiffer, Carlo van Driesten, Erwin M. Biebl

引用次数: 4

Calculations of electromagnetic fields in longitudinal irregular TEM-cells 纵向不规则tem细胞电磁场的计算

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-49-2021

Hoang Duc Pham, Katja Tüting, H. Garbe

引用次数: 1

100 Years of Wireless Telephony in Germany: Experimental Radio Transmission from Eberswalde and Königs Wusterhausen 德国无线电话的100年:来自Eberswalde和Königs Wusterhausen的实验性无线电传输

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-93-2021

W. Mathis, Anja Titze

引用次数: 1

Design and Realization of Chebyshev Bandstop Filters Based on Ceramic Resonators 基于陶瓷谐振器的切比雪夫带阻滤波器的设计与实现

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-117-2021

Jonas F. Tiede, T. Eibert

引用次数: 0

Potentials of the Application of the Electrical Transmission Line Theory for Thermal Investigations on Cables 输电线路理论在电缆热研究中的应用潜力

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-31-2021

Anika Henke, S. Frei

引用次数: 0

Performance analysis of 300 GHz backhaul links using historic weather data 300的性能分析使用历史天气数据的GHz回程链路

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-153-2021

Bo Kum Jung, T. Kürner

{"title":"Performance analysis of 300 GHz backhaul links using historic weather data","authors":"Bo Kum Jung, T. Kürner","doi":"10.5194/ars-19-153-2021","DOIUrl":"https://doi.org/10.5194/ars-19-153-2021","url":null,"abstract":"Abstract. According to the recently published IEEE standard 802.15.3d (2017), THz links operating at 300 GHz are viable to achieve more than 100 Gbit s−1 of data rate. This feature can support a transition of the future backhaul connectivity from the underground fibre connection to the wireless, where fibre links are not available or too costly to install. The EU-Japan Horizon 2020 project “ThoR” is working towards the demonstration of such links. A detailed investigation on the influence of weather conditions will help to derive planning guidelines of 300 GHz backhaul links for forthcoming applications. This paper focuses on the dependency of the THz link on the general weather by using ray-tracing simulation. Simulation is conducted combining ITU-R propagation models for atmospheric attenuation (water vapour and oxygen content of air, droplets of rains, liquid content of clouds or fog), a wind-depending swaying model for the antenna poles, and historical measured climate data for the deployment scenarios considered in the ThoR project. As a result, this research will show the feasibility of THz link in outdoor applications under general weather conditions, defines weather-dependent outage probabilities, and allows us to derive planning guidelines of THz links at a frequency of 300 GHz.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45975129","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: 3

Description of the Coupling of two Loop Antennas using Electrical Equivalent Circuit Diagrams 用等效电路图描述两个环形天线的耦合

IF 0.4

Advances in Radio Science Pub Date : 2021-12-17 DOI: 10.5194/ars-19-9-2021

Maik Rogowski, S. Fisahn, H. Garbe

{"title":"Description of the Coupling of two Loop Antennas using Electrical Equivalent Circuit Diagrams","authors":"Maik Rogowski, S. Fisahn, H. Garbe","doi":"10.5194/ars-19-9-2021","DOIUrl":"https://doi.org/10.5194/ars-19-9-2021","url":null,"abstract":"Abstract. EMC measurements must be carried out in standardized and defined measuring environments. The frequency range between 9 kHz and 30 MHz is a major challenge for measurement technology. The established test sites are designed with an perfect elelctrically conducting ground. For the considered lower frequency range, the metrological validation is carried out with magnetic field antennas in this frequency range. The aim is therefore to take into account the ferromagnetic properties of the ground plane in such a measurement environment and to describe them analytically or numerically with an electrical equivalent circuit diagram. In this article we simplify the model to two loopantennas in Freespace without groundplane to check if the approache with the ECD will work. Therefore we use various numerical field calculation programs in the frequency range up to 30 MHz. The results from simulations are to be checked for correctness with describing them analytically or numerically. For this purpose, a model consisting of two loop antennas was created and simulated in a numerical simulation program. In order to validate the results from the simulation, two different approaches to creating an electrical equivalent circuit (ECD) are examined. The first approach is based on the real equivalent circuit diagram of a coil and the second approach forms a parallel resonant circuit of the first resonance of an antennas input impedance. The focus here is on the mutual inductance, which represents the coupling between the two antennas.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43158861","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