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Assessment of the performance of the TOPGNSS and ANN-MB antennas for ionospheric measurements using low-cost u-blox GNSS receivers

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Geodesy and Geodynamics 2024年第3期15卷 291-301页

作者： Daniel Okoh Aderonke Obafaye Oluwakemi Dare-Idowu Babatunde Rabiu Anton Kashcheyev Claudio cesaroni John Bosco Habarulema Bruno Nava United Nations African Regional Centre for Space Science and Technology Education-English(UN-ARCSSTE-E) Obafemi Awolowo University CampusIle IfeNigeria National Institute for Geophysics and Volcanology(INGV) 00143 RomeItaly Institute for Space Science and Engineering African University of Science and TechnologyAbujaNigeria University of New Brunswick FrederictonCanada South African National Space Agency(SANSA) P.O Box 32Hermanus 7200South Africa Department of Physics and Electronics Rhodes University6140 MakhandaSouth Africa The Abdus Salam International Centre for Theoretical Physics Strada Costiera11I-34151 TriesteItaly

Low-cost GNSS receivers have recently been gaining reliability as good candidates for ionospheric studies. In line with these gains are genuine concerns about improving the performance of these receivers. In this work, we present a comprehensive investigation of the performances of two antennas(the u-blox ANN-MB and the TOPGNSS TOP-106) used on a low-cost GNSS receiver known as the u-blox ZED-f9P. The two antennas were installed on two identical and co-located u-blox receivers. Data used from both receivers cover the period from January to June 2022. Results from the study indicate that the signal strengths are dominantly greater for the receiver with the TOPGNSS antenna than for the receiver with the ANN-MB antenna, implying that the TOPGNSS antenna is better than the ANN-MB antenna in terms of providing greater signal strengths. Summarily, the TOPGNSS antenna also performed better in minimizing the occurrence of cycle slips on phase TEC measurements. There are no conspicuous differences between the variances(computed as 5-min standard deviations) of phase TEC measurements for the two antennas, except for a period around May-June when the TOPGNSS gave a better performance in terms of minimizing the variances in phase TEC. Remarkably, the ANN-MB antenna gave a better performance than the TOPGNSS antenna in terms of minimizing the variances in pseudorange TEC for some satellite observations. for precise horizontal(North and East) positioning, the receiver with the TOPGNSS antenna gave better results, while the receiver with the ANN-MB antenna gave better vertical(Up) positioning. The errors for the receivers of both antennas are typically within about 5 m(the monthly mean was usually smaller than 1 m) in the horizontal direction and within about 10 m(the monthly mean was usually smaller than 4 m) in the vertical direction.

关键词： GNSS Ionosphere Low-cost Antenna TOPGNSS U-blox

A measure of ionospheric irregularities:zonal velocity and its implications for L-band scintillation at low-latitudes

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Earth and Planetary Physics 2021年第5期5卷 450-461页

作者： Claudio cesaroni Luca Spogli Giorgiana De franceschi Juliana Garrido Damaceno Marcin Grzesiak Bruno Vani Joao francisco Galera Monico Vincenzo Romano Lucilla Alfonsi Massimo Cafaro Istituto Nazionale di Geofisica e Vulcanologia Italy SpacEarth Technology Italy Space Research Centre of the Polish Academy of Sciences Poland Instituto federal de Educação Ciência e Tecnologia de São PauloBrazil Universidade Estadual Paulista“Júlio de Mesquita filho” Brazil University of Salento Italy

We estimate the zonal drift velocity of small-scale ionospheric irregularities at low latitude by leveraging the spaced-receivers technique applied to two GNSS receivers for scintillation monitoring installed along the magnetic parallel passing in Presidente Prudente(Brazil,magnetic latitude 12.8°S).The investigated ionospheric sector is ideal to study small-scale irregularities,being located close to the expected position of the southern crest of the equatorial ionospheric *** measurement campaign took place between September 2013 and february 2014,*** and summer solstice seasons under solar maximum,during which the probability of formation of small-scale irregularities is expected to *** found that the hourly average of the velocity increases up to 135 m/s right after the local sunset at ionospheric altitudes and then smoothly decreases in the next *** measurements are in agreement with independent estimations of the velocity made by the Incoherent Scatter Radar located at the Jicamarca Radio Observatory(magnetic latitude 0.1°N),by the Boa Vista Ionosonde(magnetic latitude 12.0°N),and by applying a recently-developed empirical regional short-term forecasting ***,we investigated the relationship with the percentage occurrence of amplitude scintillation;we report that it is exponentially dependent on the zonal velocity of the irregularities that cause it.

关键词： ionospheric irregularities GNSS scintillation plasma drift velocity low-latitude ionosphere spaced receivers Equatorial Plasma Bubbles

儿童早期空气污染与呼吸道感染:ESCAPE项目中10个欧洲出生队列的分析

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环境与职业医学 2014年第3期31卷 202-202页

作者： Elaina A.MacIntyre Ulrike Gehring Anna Molter Elaine fuertes Claudia Klümper Ursula Kramer Ulrich Quass Barbara Hoffmann Mireia Gascon Bert Brunekreef Gerard H.Koppelman Rob Beelen Gerard Hoek Matthias Birk Johan C.de Jongste H.A.Smit Josef Cyrys Olena Gruzieva Michal Korek Anna Bergstrom Raymond M.Agius frank de Vocht Angela Simpson Daniela Porta francesco forastiere Chiara Badaloni Giulia cesaroni Ana Esplugues Ana fernández-Somoano Aitana Lerxundi Jordi Sunyer Marta Cirach Mark J.Nieuwenhuijsen Goran Pershagen Joachim Heinrich

[背景]将交通源空气污染作为幼儿期呼吸道感染的危险因素的研究很少。[目的]在10个欧洲出生队列——BAMSE（瑞典）、GASPⅡ（意大利）、GINIplus和LISAplus（德国）、MAAS（英国）、PIAMA（荷兰）和4个INMA队列（西班牙）——中研究空... 详细信息

[背景]将交通源空气污染作为幼儿期呼吸道感染的危险因素的研究很少。[目的]在10个欧洲出生队列——BAMSE（瑞典）、GASPⅡ（意大利）、GINIplus和LISAplus（德国）、MAAS（英国）、PIAMA（荷兰）和4个INMA队列（西班牙）——中研究空气污染与肺炎、哮喘及中耳炎之间的相关性，并使用meta分析得出综合效应估值。[方法]评价家长报告的医师诊断的儿童早期肺炎、中耳炎以及哮喘与全年平均污染物水平[二氧化氮（NO2）、氮氧化物（NOx）、≤2．5gm的颗粒物（PM2.5）、PM2.5吸光度、PM10、PM2.5-10（粗PM）]间的关联，污染物浓度的估计采用土地利用回归模型并根据孩子的出生住址分配。作为ESCAPE项目的一部分，每个研究区域都采用相同的方案建立回归模型。用logistic回归来计算每个研究校正后的效应估值，用随机效应meta分析来计算合并的估计值。[结果]除了PM2.5外的所有污染物，肺炎的合并校正优势比（OR）均升高（例如，N02每增加10μg／m3，OR=1．30，95％CI：1．02～1．65；PM10每增加10μg／m3的OR=1．76，95％CI：1．00—3．09）。对于中耳炎和哮喘，除了NO2与中耳炎问的关联（每10μg／m3对应的OR=1．09，95％CI：1．02～1．16），所有分析的结果均无显著性。[结论]对ESCAPE项目中10个欧洲出生队列进行的meta分析为空气污染和儿童早期肺炎之间的相关性找到一致性的证据，也为与中耳炎间的相关性找到了一些证据。

关键词：早期肺炎呼吸道感染出生队列空气污染欧洲儿童 meta分析 logistic