Radio Science最新文献_第8页

Cold electron temperature in the inner magnetosphere estimated through the dispersion relation of ECH waves from the Arase satellite observations 通过 Arase 卫星观测的 ECH 波的弥散关系估算内磁层的冷电子温度

IF 1.6 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Radio Science

Pub Date : 2024-06-01 DOI: 10.1029/2023RS007927

Tomoe Taki;Satoshi Kurita;Hirotsugu Kojima;Yoshiya Kasahara;Shoya Matsuda;Ayako Matsuoka;Yoichi Kazama;Chae-Woo Jun;Shiang-Yu Wang;Sunny W. Y. Tam;Tzu-Fang Chang;Bo-Jhou Wang;Yoshizumi Miyoshi;Iku Shinohara

We have analyzed Electrostatic Electron Cyclotron Harmonic (ECH) waves observed using interferometry observation mode performed by the Arase satellite to estimate low-energy electron temperatures. Interferometry can be used to calculate velocities, but the Arase satellite can only perform interferometry observations in a one-dimensional direction. We proposed a method to estimate the wave vector of the observed ECH waves from the observed electric fields and calculated the phase velocity for each frequency. We determined the particle parameters from the particle detector and the upper hybrid resonance and estimated the unknown low-energy electron temperature from the agreement between the observed ECH dispersion relation and the theoretical dispersion curves. We performed our analysis for six events and found that the low-energy electron temperature in the observed region is on the order of 1 eV.

我们分析了利用Arase卫星进行的干涉测量观测模式观测到的静电电子回旋谐波（ECH），以估算低能电子温度。干涉测量可用于计算速度，但 Arase 卫星只能进行一维方向的干涉测量观测。我们提出了一种方法，从观测到的电场中估算出观测到的 ECH 波的波矢量，并计算出每个频率的相位速度。我们通过粒子探测器和上混合共振确定了粒子参数，并根据观测到的 ECH 色散关系和理论色散曲线之间的一致性估算了未知的低能电子温度。我们对六个事件进行了分析，发现观测区域的低能电子温度约为 1 eV。

引用次数: 0

Structures and backscattering characteristics of CUSAT 205 MHz stratosphere-troposphere radar at Cochin (10.04°N, 76.3°E)—first results 位于科钦（北纬 10.04°，东经 76.3°）的 CUSAT 205 MHz 平流层-对流层雷达的结构和后向散射特征 - 初步结果

IF 1.6 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Radio Science

Pub Date : 2024-06-01 DOI: 10.1029/2023RS007894

Nabarun Poddar;Siddarth Shankar Das;Veenus Venugopal;S. Abhilash;V. Rakesh

This paper presents the first ever observations on aspect-sensitive characteristics of 205 MHz stratosphere-troposphere (ST) radar located at a tropical station Cochin (10.04°N, 76.3°E) using volume scanning. The most significant and new observation is that the signal-to-noise ratio in zenith and off-zenith beams are nearly equal in some height region, indicating the presence of isotropic turbulence. Signal strength decreases by 0.75 dB per degree from 0 to 10 degree off-zenith, 0.9 dB per degree from 10 to 20 degree off-zenith and 0.3 dB per degree beyond 20 degree off-zenith. Different causative mechanisms are discussed on the basis of various estimated parameters associated with aspect sensitivity. Maximum aspect sensitivity is observed between 12 and 17 km, indicating the presence of dynamic instability arising due to strong wind shear and atmospheric stability. When both the square of wind shear and stability parameters are above 0.25 × 10⁻³ s⁻², the scatterers become mostly isotropic. The study also shows a power difference in the symmetric beams as well as azimuth angle dependency. Analysis suggests that this asymmetry is due to the tilting of layers by the action of atmospheric gravity waves generated through Kelvin-Helmholtz instability. The present configuration of radar can provide a better understanding of three-dimensional structures of turbulence and instabilities.

本文首次利用体积扫描对位于科钦热带站（北纬 10.04°，东经 76.3°）的 205 MHz 平流层-对流层（ST）雷达的面敏感特性进行了观测。最重要的新观测结果是，在某些高度区域，天顶波束和非天顶波束的信噪比几乎相等，表明存在各向同性湍流。信号强度在离天顶 0 至 10 度之间每度下降 0.75 分贝，在离天顶 10 至 20 度之间每度下降 0.9 分贝，在离天顶 20 度以上每度下降 0.3 分贝。根据与面高敏感度相关的各种估计参数，讨论了不同的成因机制。在 12 至 17 千米之间观测到了最大的面敏感性，这表明由于强风切变和大气稳定性而产生的动态不稳定性的存在。当风切变和稳定度参数的平方都高于 0.25 × 10-3 s-2 时，散射体大多成为各向同性。研究还显示了对称波束的功率差异以及方位角依赖性。分析表明，这种不对称是由于开尔文-赫尔姆霍兹不稳定性产生的大气重力波作用下的层倾斜造成的。目前的雷达配置可以让人们更好地了解湍流和不稳定性的三维结构。

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引用次数: 0

AI-assisted design of printed edge-fed non-uniform ZigZag antenna for mm-wave automotive radar 用于毫米波汽车雷达的印刷边馈非均匀之字形天线的人工智能辅助设计

IF 1.6 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Radio Science

Pub Date : 2024-06-01 DOI: 10.1029/2023RS007912

L. Poli;P. Rocca;P. Rosatti;N. Anselmi;M. Salucci;S. Yang;F. Yang;A. Massa

In this paper, the design of a novel horizontally polarized single-layer antenna for 77 (GHz) automotive radar applications is4 addressed. An innovative non-uniform zig-zag parametrization of the antenna layout is considered to enable a more flexible control on both the impedance matching in the working frequency band and the shaping of the radiated beam pattern with respect to a standard (uniform) one without compromising the linear (horizontal) polarization of the radiated field. Such a polarization guarantees a lower back-scattering from road pavements, resulting in a reduced amount of clutter and thus allowing a more robust target detection. Moreover, the single-layer layout has several advantages in terms of fabrication simplicity/costs and mechanical robustness to vibrations. The design of the proposed non-uniform zig-zag antenna (NZA) is performed through a customized implementation of the System-by-Design (SbD) approach that fruitfully combines machine learning and evolutionary optimization to efficiently deal with the computational complexity at hand. An extensive numerical validation, dealing with designs of different lengths, verifies the high performance of the NZA in terms of beam direction deviation (e.g., BDD < 1 (deg)), sidelobe level (e.g., SLL < —18.2 (dB)), and polarization ratio (e.g., PR > 20 (dB)) within the working frequency band H = [76 : 78] (GHz), as well as its superiority over competitive designs. Finally, the realization of a prototype and its experimental test, validate the proposed NZA concept for automotive mm-wave radar applications in advanced driver assistance systems and autonomous vehicles such as, for instance, adaptive cruise control, collision avoidance, and blind spot detection.

本文针对 77 (GHz) 汽车雷达应用设计了一种新型水平极化单层天线4。本文考虑对天线布局进行创新性的非均匀之字形参数化，以便在不影响辐射场的线性（水平）极化的情况下，更灵活地控制工作频段内的阻抗匹配和辐射波束图形的形状，而不是标准（均匀）波束图形。这种极化可确保降低路面的反向散射，从而减少杂波量，使目标探测更加可靠。此外，单层布局还具有制造简单/成本低、抗震性强等优点。所提出的非均匀之字形天线（NZA）的设计是通过定制的系统设计（SbD）方法实现的，该方法将机器学习和进化优化有效地结合在一起，以有效地处理手头的计算复杂性。对不同长度的设计进行了广泛的数值验证，验证了 NZA 在工作频段 H = [76 : 78] (GHz) 内的波束方向偏差（如 BDD < 1 (deg)）、侧膜水平（如 SLL < -18.2 (dB)）和极化率（如 PR > 20 (dB)）方面的高性能，以及与竞争设计相比的优越性。最后，原型的实现及其实验测试验证了所提出的 NZA 概念在先进驾驶辅助系统和自动驾驶汽车（如自适应巡航控制、避免碰撞和盲点检测）中的汽车毫米波雷达应用。

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引用次数: 0

On The Effective Capacity Performance Analysis Over Nakagami-m Distribution-Based Double-Shadowed Rician Fading Channel 基于 Nakagami-m 分布的双影 Rician Fading 信道的有效容量性能分析

IF 1.6 4区地球科学 Q2 Earth and Planetary Sciences

Radio Science

Pub Date : 2024-04-10 DOI: 10.1029/2023rs007868

Rajnish K. Ranjan, Atanu Chowdhury, Dibyendu Ghoshal

The practical applications within the domain of the fifth generation (5G) and the emerging beyond 5G network necessitate a high data transmission rate along with minimal achievable delay. With this objective in focus, the maximum capacity is extensively quantified through the utilization of the delay-constrained effective capacity (EC) technique, which stands in contrast to Shannon's ergodic capacity. The current study is engaged in the analysis of EC within a delay-limited wireless system operating in a double-shadowed Rician (DSR) fading channel. Within this channel, only the Nakagami-m distribution concept has been applied to both the dominant and secondary shadowing components of the proposed network model. A new exact closed-form expression for EC within the DSR fading channel has been derived using the Fox-H function. Furthermore, an analysis has been conducted for both high and low signal-to-noise ratios to provide further insights and explanations for the proposed model. It is worth noting that the results obtained from both simulation and analytical methods exhibit substantial similarity, revealing interdependence among various parameters present in the proposed model.

第五代（5G）和新兴的超越 5G 网络领域的实际应用需要高数据传输速率和最小的可实现延迟。基于这一目标，最大容量通过利用延迟受限有效容量（EC）技术得到了广泛量化，这与香农的遍历容量形成了鲜明对比。目前的研究主要是分析在双影 Rician（DSR）衰减信道中运行的延迟受限无线系统中的有效容量。在该信道中，只有 Nakagami-m 分布概念被应用于拟议网络模型的主要和次要阴影部分。利用 Fox-H 函数推导出了 DSR 衰减信道中 EC 的新精确闭式表达式。此外，还对高信噪比和低信噪比进行了分析，以进一步深入了解和解释所提出的模型。值得注意的是，模拟和分析方法得出的结果具有很大的相似性，揭示了拟议模型中各种参数之间的相互依存关系。

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引用次数: 0

Statistical Analysis of Off-Great Circle Radio Wave Propagation in the Polar Cap 极圈外无线电波在极冠传播的统计分析

IF 1.6 4区地球科学 Q2 Earth and Planetary Sciences

Radio Science

Pub Date : 2024-04-08 DOI: 10.1029/2023rs007897

T. G. Cameron, R. A. D. Fiori, G. W. Perry, A. Spicher, T. Thayaparan

High latitude ionospheric density structures such as polar cap patches and arcs are capable of deflecting high frequency (HF) radio waves to off-great circle paths, and are likely detrimental to technologies dependent on HF radio propagation. In this study, nearly 2.5 years of 4.6–14.4 MHz data from a multi-frequency HF radio link between Qaanaaq, Greenland and Alert, Canada are used to investigate high-latitude off-great circle propagation in the polar cap. After an example of HF radio propagation affected by polar cap patches is shown in detail, a statistical analysis of the occurrence and impacts of off-great circle deflections in the polar cap is presented. Off-great circle propagation is shown to be increasingly common with increasing frequency up to 11.1 MHz, such that averaged over 1 year, received 11.1 MHz signals experienced deflections >30° from the great circle direction 65.6% of the time. The occurrence of these deflections across the year is shown to be at a maximum in the winter, while occurrence across the day varies with season. Trends across both time of day and time of year for 11.1 and 14.4 MHz deflections are consistent with polar cap patch occurrence trends. Off-great circle deflections are shown to be associated with increased time-of-flights, a larger range of positive and negative Doppler shifts, increased Doppler spreads, and lower signal-to-noise ratios. These results are discussed in the context of ionospheric phenomena in the polar cap, and implications for over-the-horizon radars operating at high latitudes.

高纬度电离层密度结构（如极盖斑块和弧线）能够将高频无线电波偏转到大圆以外的路径，很可能对依赖高频无线电传播的技术造成损害。本研究利用格陵兰岛 Qaanaaq 和加拿大 Alert 之间多频率高频无线电链路近 2.5 年的 4.6-14.4 MHz 数据，研究极冠中的高纬度偏离大圆传播。在详细展示了受极冠斑块影响的高频无线电传播实例之后，介绍了极冠偏离大圆偏转的发生和影响的统计分析。结果表明，随着频率的增加，偏离大圆传播的现象越来越普遍，最高频率可达 11.1 MHz，因此平均 1 年内，接收到的 11.1 MHz 信号有 65.6% 的时间偏离大圆方向 30°。这些偏转的全年发生率在冬季达到最大，而全天发生率则随季节而变化。11.1 和 14.4 MHz 偏转在一天和一年中的发生趋势与极冠斑的发生趋势一致。研究表明，偏离大圆偏转与飞行时间增加、多普勒正负偏移范围增大、多普勒频差增大和信噪比降低有关。在极冠电离层现象的背景下讨论了这些结果以及对在高纬度运行的超视距雷达的影响。

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引用次数: 0

Thank You to Our 2023 Reviewers 感谢我们的 2023 评论员

IF 1.6 4区地球科学 Q2 Earth and Planetary Sciences

Radio Science

Pub Date : 2024-04-08 DOI: 10.1029/2024rs008003

Sana Salous, Kazuya Kobayashi

Science operates best by sharing accurate new knowledge in clear ways. To check our assumptions, our methods, and our interpretations of the observations, experiments, analyses, and calculations that we do, we ask experts who were not involved in the study to critically evaluate our work. We call this peer review. They look for completeness, accuracy, whether work is new, and how clearly we have written the descriptions. We continue to be humbled by the time, effort, and careful insights that our colleagues share with each other through the process of peer review. Thank you all for your efforts toward advancing radio science now and for the future.

Individuals in italics provided three or more reviews for Radio Science during the year.

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Hector Garcia Martinez

Heidi Morris

科学的最佳运作方式是以清晰的方式分享准确的新知识。为了检查我们的假设、我们的方法以及我们对观察、实验、分析和计算的解释，我们会请没有参与研究的专家对我们的工作进行严格的评估。我们称之为同行评审。他们关注的是完整性、准确性、工作是否新颖，以及我们的描述是否清晰。我们的同事们通过同行评审过程分享了彼此的时间、精力和细致的见解，这让我们继续感到谦卑。感谢大家为现在和未来推动无线电科学所做的努力。Aaron ChippendaleAbid KhanAbubaker EloiedAdam BeardsleyAdel ThaljaouiAdnan CheemaAgri FaturahmanAiswarya RSAjeet KumarAkimasa HirataAlan E. E. RogersAlbane Sainten.罗杰斯Albane SaintenoyAlex ChartierAlex MinettoAlexander ShvetsAlexei DmitrievAlexey OinatsAli ZidourAlireza MahmoudianAlison MoraesAmir RezagholiAmjad IqbalAna EliasAnand KumarAndres Romero-WolfAndrey LyakhovAngelo De SantisAnimesh MaitraAnkan BhattacharyaAshik PaulAsif AhmedAsma SAtsuki ShinboriAvinash DeshpandeAxel von EngelnAyman AlthuwaybBalaji KBenjamin ReidBing李波 AiBrecht De BeeldeBrent PageBrian BreitschC VedavathiCarlo ScottoChandan Kumar GhoshChao XiongChaoxian QiCharles NaudetCherry NgChinmoy BhattacharyaChristina ArrasChristopher沃克科纳-布伦南克莱格-罗杰D-萨马-阿昌塔Daban Kadhim Omar DabbaghDalia Nandi丹尼尔-格林维Daniel Kastinen丹尼尔-库巴Daniel Okoh丹尼尔-奥科Dariia Savelian达里奥-博扬亚克达里奥-萨巴格Dave Laurenson达里奥-劳森SabbaghDave LaurensonDavid HartleyDavid ThemensDayang LiDeepak SinghDinesh Jackson Samuel SamuelDmitrii SolomitckiiDominique LesselierDustin BuccinoEdmund SpencerEduardo Araujo-PradereElnour BadjacDario BojanjacDarioPradereElnour BadriaEnrico TestiErcha AaEuclides ChumaFrançois LavouéGareth ChishamGargi RakshitGerald AradaGiada BattagliaGiuseppe MazzarellaGlenn HusseyGuanyi MaGunter StoberGuobin YangGuozhu LiH.李国柱傅海洋Hector Garcia MartinezHeidi MorrisHenry BertoniHervé AubertHirohide SerizawaIngemar HaggstromIoanna TsagouriIvana KolmašováIwona StanislawskaJack SingalJacopo NanniJames BreakallJamie麦卡勒姆Jamshed IqbalJeff LapierreJianguo YanJiaojiao ZhangJie HuangJingting LiJingwei CaoJingyuan LiJinxin DuJiuhou LeiJoël LemortonJohannes BöhmJohn Bosco HabarulemaJohn MarinoJohn VeseckyJorge ChauJosé A．López-FernándezJose GilJosé Manuel RieraJoseph Alejandro GallegoJoseph LazioJoseph OlwendoJuan Pascual GarcíaJuan R. MosigJumin ZhaoJunjie ChenK.S. S.Sai SrujanKai ZhaoKaishan SongKarpagam NKatrhik KKazue TakahashiKazuhiro UeharaKe GuanKeigo IshisakaKeith GrovesKevin ShoemakerKhawar KhokharKheyali BarmanKiran SKnut SolnaKrishna NaikKristin VielbergKrzysztof StasiewiczKumar VijayMishraKumutha DKunde YangKwangsun RyuLakshmana KumarLaurent CastanetLaysa ResendeLee RogersLei ZhangLeonid ChernogorLichun LiLida KouhalvandiLijun ZhangLoredana PerroneLucilla AlfonsiLuis NavarroLuke NugentLuolei ZhangM Durga RaoM.G. ManojMahlatse KganyagoMakhabbat KokkozMakoto TaromaruMalathi KanagasabaiMani SivakandanManikandan KManuel de la Torre JuárezMarco ZannoniMarcus LandschulzeMargaret CheneyMarianna FeliciMaximilian ArpaioMayra LebronMd.Faruque HossainMei LiMichael DavidMichael PezzopaneMichael SchönhuberMichiel BrentjensMing DongMireille LevyMitsunori OzakiMohamed Nafrees ACMohammad AlibakhshikenariMohammad KhorramiMohammad Naser-MoghadasiMohammed BMonique PotgieterMorris CohenMorteza Mohammadi ShirkolaeiMuhammad QamarMurilo Teixeira S

{"title":"Thank You to Our 2023 Reviewers","authors":"Sana Salous, Kazuya Kobayashi","doi":"10.1029/2024rs008003","DOIUrl":"https://doi.org/10.1029/2024rs008003","url":null,"abstract":"Science operates best by sharing accurate new knowledge in clear ways. To check our assumptions, our methods, and our interpretations of the observations, experiments, analyses, and calculations that we do, we ask experts who were not involved in the study to critically evaluate our work. We call this peer review. They look for completeness, accuracy, whether work is new, and how clearly we have written the descriptions. We continue to be humbled by the time, effort, and careful insights that our colleagues share with each other through the process of peer review. Thank you all for your efforts toward advancing radio science now and for the future.\u0000Individuals in italics provided three or more reviews for Radio Science during the year.\u0000A\u0000Aaron Chippendale\u0000Abid Khan\u0000Abubaker Elobied\u0000Adam Beardsley\u0000Adel Thaljaoui\u0000Adnan Cheema\u0000Agri Faturahman\u0000Aiswarya RS\u0000Ajeet Kumar\u0000Akimasa Hirata\u0000Alan E. E. Rogers\u0000Albane Saintenoy\u0000Alex Chartier\u0000Alex Minetto\u0000Alexander Shvets\u0000Alexei Dmitriev\u0000Alexey Oinats\u0000Ali Zidour\u0000Alireza Mahmoudian\u0000Alison Moraes\u0000Amir Rezagholi\u0000Amjad Iqbal\u0000Ana Elias\u0000Anand Kumar\u0000Andres Romero-Wolf\u0000Andrey Lyakhov\u0000Angelo De Santis\u0000Animesh Maitra\u0000Ankan Bhattacharya\u0000Ashik Paul\u0000Asif Ahmed\u0000Asma S\u0000Atsuki Shinbori\u0000Avinash Deshpande\u0000Axel von Engeln\u0000Ayman Althuwayb\u0000Balaji K\u0000Benjamin Reid\u0000Bing Li\u0000Bo Ai\u0000Brecht De Beelde\u0000Brent Page\u0000Brian Breitsch\u0000C Vedavathi\u0000Carlo Scotto\u0000Chandan Kumar Ghosh\u0000Chao Xiong\u0000Chaoxian Qi\u0000Charles Naudet\u0000Cherry Ng\u0000Chinmoy Bhattacharya\u0000Christina Arras\u0000Christopher Volk\u0000Conor Brennan\u0000Craig Rodger\u0000D Sarma Achanta\u0000Daban Kadhim Omar Dabbagh\u0000Dalia Nandi\u0000Daniel Greenway\u0000Daniel Kastinen\u0000Daniel Kouba\u0000Daniel Okoh\u0000Dariia Savelian\u0000Dario Bojanjac\u0000Dario Sabbagh\u0000Dave Laurenson\u0000David Hartley\u0000David Themens\u0000Dayang Li\u0000Deepak Singh\u0000Dinesh Jackson Samuel Samuel\u0000Dmitrii Solomitckii\u0000Dominique Lesselier\u0000Dustin Buccino\u0000Edmund Spencer\u0000Eduardo Araujo-Pradere\u0000Elnour Badria\u0000Enrico Testi\u0000Ercha Aa\u0000Euclides Chuma\u0000François Lavoué\u0000Gareth Chisham\u0000Gargi Rakshit\u0000Gerald Arada\u0000Giada Battaglia\u0000Giuseppe Mazzarella\u0000Glenn Hussey\u0000Guanyi Ma\u0000Gunter Stober\u0000Guobin Yang\u0000Guozhu Li\u0000H. Adenle\u0000Hai-Sheng Zhao\u0000Haiyang Fu\u0000Hector Garcia Martinez\u0000Heidi Morris","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"68 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140598983","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

Variation in Total Electron Content Over Ethiopia During the Solar Eclipse Events 日食事件期间埃塞俄比亚各地总电子含量的变化

IF 1.6 4区地球科学 Q2 Earth and Planetary Sciences

Radio Science

Pub Date : 2024-04-08 DOI: 10.1029/2023rs007830

Chali Idosa Uga, Sujan Prasad Gautam, Uluma Edward, Binod Adhikari, Dessalegn Teferi, Ashutosh Giri, Athwart Davis Odhiambo, Ayomide Olabode

This work studies variations of ionospheric total electron content (TEC) during four distinct solar eclipse events over the Ethiopia region. Dual-frequency global positioning system (GPS) data obtained from UNAVCO over Addis Ababa (9.036°N, 38.76°E) and Bahir Dar (11.6°N, 37.34°E) stations are used to examine the ionospheric variability during two annular solar eclipses on 15 January 2010 and 1 September 2016, a partial solar eclipse on 4 January 2011, and a hybrid solar eclipse (the eclipse path starts out as annular but later changes to total) on 3 November 2013. The results show a significant decrease in TEC values during the occurrence of the solar eclipses. Specifically, the TEC values are reduced to −20% and −10% during the annular eclipse on 15 January 2010, −33% and −38% during the partial solar eclipse on 4 January 2011, −26% and −24% during the annular solar eclipse on 1 September 2016, over the Addis Ababa and Bahir Dar stations, respectively. There is only minimal change in TEC of −8% and −9% at Addis Ababa and Bahir stations, respectively, during the 3 November 2013 solar eclipse even if the obstruction rate is high over the study area. Furthermore, the study shows that the spatial gradient of TEC reduction varies at different locations, which is attributed to the distinct amount of reduction in solar radiation reaching the Earth's surface, resulting in reduced photo-ionization. Overall, this study provides insightful information about the behavior of the ionospheric TEC during solar eclipses over Ethiopia and emphasizes the use of dual-frequency GPS data in tracking the variations of the TEC.

这项工作研究了埃塞俄比亚地区日食期间电离层电子总含量（TEC）的变化。研究利用 UNAVCO 在亚的斯亚贝巴（北纬 9.036°，东经 38.76°）和巴哈达尔（北纬 11.6°，东经 37.34°）站上获取的双频全球定位系统数据，研究 2010 年 1 月 15 日和 2016 年 9 月 1 日两次日环食、2011 年 1 月 4 日一次日偏食和 2013 年 11 月 3 日一次混合日食（日食路径开始为环食，但随后变为全食）期间电离层的变化。结果显示，在日食发生期间，TEC 值明显下降。具体而言，2010 年 1 月 15 日日环食期间，亚的斯亚贝巴和巴哈达尔站上空的 TEC 值分别减少至 -20% 和 -10%；2011 年 1 月 4 日日偏食期间分别减少至 -33% 和 -38%；2016 年 9 月 1 日日环食期间分别减少至 -26% 和 -24%。2013 年 11 月 3 日日食期间，即使研究区域上空的阻挡率很高，亚的斯亚贝巴和巴哈尔站的 TEC 变化也很小，分别为 -8% 和 -9%。此外，研究还表明，不同地点的 TEC 下降空间梯度各不相同，这是因为到达地球表面的太阳辐射明显减少，导致光电离减少。总之，这项研究提供了有关埃塞俄比亚上空日食期间电离层 TEC 行为的深刻信息，并强调了在跟踪 TEC 变化时使用双频 GPS 数据的重要性。

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引用次数: 0

Statistical Analysis of Ionospheric Correlation for Shortwave System 短波系统电离层相关性统计分析

IF 1.6 4区地球科学 Q2 Earth and Planetary Sciences

Radio Science

Pub Date : 2024-04-01 DOI: 10.1029/2023rs007893

Mingjie Lv, Qiong Tang, Jiandong Qiao, Wei Qiao, Chen Zhou

Statistical analysis of the temporal and spatial variations in the ionosphere is necessary to improve the shortwave system. Based on the standardized Euclidean distance algorithm, multisource ionospheric assimilation data, International GNSS Service vertical total electron content data, and ionosonde data are used to statistically analyze the ionospheric correlation distance, and the variation of ionospheric correlation distances with local times, magnetic latitudes, and seasons are obtained. The statistical analysis results show that the zonal ionospheric correlation distance presents minima in the equatorial ionospheric anomaly crest regions. Additionally, the meridional correlation distance in middle magnetic latitudes is greater than that in other regions. The zonal ionospheric correlation distance presents obvious local‐time variability. The variation trends of the meridional and zonal correlation distance during spring and autumn are similar. The patterns of the ionospheric correlation range variation with local times, magnetic latitudes, and seasons can be used to select the optimal locations or spacing for ionosonde stations, shortwave multi‐station systems, and shortwave radio beacons.

要改进短波系统，就必须对电离层的时空变化进行统计分析。基于标准化欧氏距离算法，利用多源电离层同化数据、国际全球导航卫星系统服务垂直电子总含量数据和电离层探测仪数据对电离层相关距离进行了统计分析，得到了电离层相关距离随当地时间、磁纬度和季节的变化情况。统计分析结果表明，电离层相关距离在赤道电离层异常波峰区域呈现最小值。此外，中磁纬地区的子午相关距离大于其他地区。带状电离层相关距离呈现出明显的局时变化。经向相关距离和带状相关距离在春季和秋季的变化趋势相似。电离层相关距离随当地时间、磁纬度和季节的变化规律可用于选择电离层探测仪台站、短波多站系统和短波无线电信标的最佳位置或间距。

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引用次数: 0

Synthesis of elliptically shaped aperiodic antenna arrays subject to complex design constraints 受复杂设计约束的椭圆形超周期天线阵列的合成

IF 1.6 4区地球科学 Q2 Earth and Planetary Sciences

Radio Science

Pub Date : 2024-03-30 DOI: 10.1029/2023RS007914

J. M. E. Geerarts;G. Theis;A. B. Smolders;D. Caratelli

State-of-the-art conformal array pattern synthesis techniques typically suffer from a significant computational burden. This article builds upon the auxiliary array pattern synthesis technique, allowing the technique to work on elliptical contours. This deterministic method is both computationally efficient and capable of handling complex design cases with additional design constraints. In order to highlight the versatility and applicability, the method has been applied to an elliptical arc array comprised of Rampart antennas and an elliptical ring array using dipole elements. The results have been validated through full-wave electromagnetic simulations, as well as physical measurements. Both arrays presented show good agreement with the proposed synthesis technique. Highlighting the ability to satisfy additional design constraints, such as enforcing a minimal element spacing or having a controlled beamformer-network complexity.

最先进的共形阵列图案合成技术通常会带来巨大的计算负担。本文以辅助阵列图案合成技术为基础，使该技术能够用于椭圆轮廓。这种确定性方法不仅计算效率高，而且能够处理具有额外设计约束的复杂设计案例。为了突出该方法的多功能性和适用性，我们将其应用于由 Rampart 天线组成的椭圆弧形阵列和使用偶极子元件的椭圆环形阵列。结果已通过全波电磁仿真和物理测量进行了验证。所展示的两个阵列都与所提出的合成技术有很好的一致性。突出了满足额外设计约束的能力，如强制最小元件间距或控制波束成形器-网络的复杂性。

引用次数: 0

Front matters 前方事项

IF 1.6 4区地球科学 Q2 Earth and Planetary Sciences

Radio Science

Pub Date : 2024-03-30 DOI: 10.1002/rds.21241

引用次数: 0