该杂志发表大地测量学和地球物理学领域的原创研究论文，标题为：航空学和空间物理学、电磁研究、大地测量学和重力测量学、地球动力学、地球数学、岩石物理学、地震学、固体地球物理学、历史。处理喀尔巴阡山脉及其周边地区问题的论文是首选。同样，匈牙利大地测量学家和地球物理学家传统上涵盖的主题（例如稳健估计、大地水准面、地壳的电磁特性、地磁脉动和地震风险）的论文特别受欢迎。

The journal "Acta Geodaetica et Geophysica" publishes original research papers in the fields of geodesy and geophysics. The main topics covered include aeronautics and space physics, electromagnetic studies, geodesy and gravimetry, geodynamics, geomathematics, rock physics, seismology, solid Earth physics, and historical research. Papers addressing issues related to the Carpathian Mountains and surrounding areas are particularly welcome. Additionally, topics traditionally covered by Hungarian geodesists and geophysicists, such as robust estimation, geoid, electromagnetic properties of the crust, geomagnetic pulsations, and seismic risk, are also highly favored.

《Acta Geodaetica et Geophysica》杂志发表大地测量学和地球物理学领域的原创研究论文。主要涵盖的主题包括航空学与空间物理学、电磁研究、大地测量学与重力测量学、地球动力学、地球数学、岩石物理学、地震学、固体地球物理学以及历史研究。特别欢迎处理喀尔巴阡山脉及其周边地区问题的论文。此外，匈牙利大地测量学家和地球物理学家传统上关注的主题，如稳健估计、大地水准面、地壳的电磁特性、地磁脉动和地震风险等，也特别受欢迎。

Acta Geodaetica et Geophysica

Gilda de Lourdes González

Multi-instrument analysis of F-region ionospheric irregularities suppression over South America during the November 3, 2021, geomagnetic storm

2021年11月3日地磁暴期间南美洲F区电离层不规则体抑制的多仪器分析

Abstract This study outlines the planning, emphases, and proposed implementation of a gravimetric control network for Israel. The establishment of a comprehensive and accurate gravimetric control network is crucial for various geodetic applications, including geoid determination, gravity field modelling, vertical datum establishment, and geophysical studies. This study aims to provide a framework for the development and implementation of such a network in Israel. The proposed network is divided into two orders. The first order, also known as the absolute order or zero order, comprises four stations situated in geologically stable and tranquil locations. The second order, referred to as the first order, is established through relative gravimetric measurements. This order will encompass 29 stations positioned in areas that are both stable and secure. The zero and first order stations will be evenly distributed throughout the country to ensure homogeneous coverage. The proposed gravimetric network is in conjunction with the requirements to improve the geoid undulation model of Israel. Through the establishment of a small gravimetric network and the implementation of relative gravimetric measurements, we were able to determine the optimal control point density and establish a well-structured methodology for measurement, analysis, and the adjustment process.

Gilad Even-Tzur

Alaa Ghanayim

Planning, emphasis and proposal for implementation of gravimetric control network in Israel

以色列重力控制网规划、重点与实施建议

Abstract This work presents a technique to transform a global spherical to an adjusted local rectangular harmonic model. First, the mathematical form of a global spherical harmonic model is presented. Second, the necessary conversion from global (geocentric) into local rectangular coordinates is given. Third, Laplace’s equation is solved by the method of separation of variables in local rectangular coordinates and its solutions in different functional forms are presented. Then, the estimation of the coefficients of these mathematical models by a least squares’ adjustment process is described, using as data the values of the disturbing potential of the Earth’s gravity field. The strategy for the selection of the best mathematical model for a successful transformation is described and validated in different case studies. These refer to areas in Greece, China and Germany and include comparisons with other models or methods. The results show the applicability of the presented transformation and confirm its advantages.

Georgios Panou

Romylos Korakitis

Transformation from a global spherical to an adjusted local rectangular harmonic model

从全球球面到调整后的局部直角谐波模型的转换

Abstract El-Bakriya area is situated in the Central Eastern Desert of Egypt. It includes several mineral occurrences and/or deposits. Data from remote sensing and airborne geophysics (gamma-ray and magnetic) were combined to identify the hydrothermal alteration zones and structures related to these occurrences. Various processing of ASTER satellite images revealed fifteen zones of high probability for metallic mineralizations. Airborne gamma-ray spectrometric data clarify K-enrichment zones, which are correlated geologically with the distribution of calc-alkaline, alkali feldspar granites (Younger granites), and calc-alkaline quartzdiorites to granodiorites (Older granites), as well as basement metavolcanics and metasediments. An integrated hydrothermal alteration map was constructed, based on both ASTER remote sensing and airborne gamma-ray spectrometric data. This map delineates some metallic mineral occurrences and/or deposits, which are located in the detected hydrothermal alteration zones. Besides, it displays new potential zones for mineralization, such as: Gabal (G.) El-Shalul, G. El-Bakriya, G. Siwat El-Arsha and G. Umm Bisilla. The geologic and airborne magnetic maps demonstrate five structural lineament trends of E–W, ENE–WSW, NE–SW, NW–SE, and NNW–SSE directions, which might act as pathways to transport the hydrothermal solutions in the study area.

Reda Abdu Yousef El-Qassas

Atef Mohamed Abu-Donia

Ali Elsayed Ali Omar

Delineation of hydrothermal alteration zones associated with mineral deposits, using remote sensing and airborne geophysics data. A case study: El-Bakriya area, Central Eastern Desert, Egypt

利用遥感与航空地球物理数据圈定与矿床相关的蚀变带——以埃及中东部沙漠El-Bakriya地区为例

Abstract Previously drilled boreholes of a host rock for a potential nuclear waste repository in Hungary revealed a highly fractured claystone rock body. A crucial step for characterizing the hydrodynamic behavior of such a fractured reservoir is fracture identification and accurate calculation of the fracture density. Although acoustic borehole televiewers provide a reliable base for determining the fracture density, older boreholes usually lack such data. However, conventional borehole geophysical measurements are often accessible in such cases. The aim of this study was to identify any correlations between well log data and fracture density. Multiple linear regression analysis was performed on data from two boreholes penetrating the Boda Claystone Formation in southwest Hungary. The upper section of the BAF-4 borehole was used for training, where the fracture density was estimated with a fit of R 2 = 0.767. The computed regression function predicted the fracture density with high accuracy in both boreholes for all intervals with typical lithological features. However, in some sections where anomalous well log data indicated changes in the lithology, the prediction accuracy decreased. For example, the function underestimated the fracture density in sandy intervals.

Emese Tóth

Ervin Hrabovszki

Tivadar M. Tóth

Using geophysical log data to predict the fracture density in a claystone host rock for storing high-level nuclear waste

利用地球物理测井数据预测用于储存高水平核废料的泥岩母岩中的裂缝密度

Abstract This article consolidates and organizes modern methods for calibrating relative gravimeters, aiming to streamline the selection and implementation of effective calibration systems, particularly in Kazakhstan. The concept of the calibration function and various methods for its determination are presented. Practical implementations of laboratory methods relevant to modern high-precision relative gravimeters are discussed, including the tilt, moving mass, artificial acceleration, and line calibration methods. Data processing through least squares adjustment at the calibration line and an overview of existing software packages for gravity observation equalization are explored. The article also covers existing horizontal and vertical calibration systems in different countries, detailing their main characteristics and schematics. Finally, an estimation of scale factors for five years of measurements with Scintrex CG-5 gravimeters at the Zhetygen calibration line in Kazakhstan is provided.

Roman Sermiagin

Nurgan Kemerbayev

Khaini-Kamal Kassymkanova

Guzyaliya Mussina

Maral Shkiyeva

Nikolay Kosarev

Kanat Samarkhanov

Assel Batalova

Azamat Rakhimzhanov

Yeraly Kalen

Selection of a calibration system for relative gravimeters and testing of the processing using the example of the Zhetygen calibration baseline in Kazakhstan

相对重力仪校准系统选择及处理测试——以哈萨克斯坦Zhetygen校准基线为例

Abstract With the Beidou navigation system's fast expansion in China, it is popular in military and civilian aspects. However, since the satellite orbit operates at an extremely high position and there is energy loss during the propagation process, the receiver only picks up a very faint signal, which makes the Beidou receiver very vulnerable to interference. The interference of the receiver is divided into natural interference and human interference, of which the human interference is particularly serious. Deception is commonly used in human interference. The deception interference detection technology in Beidou navigation system is studied in this research. Firstly, the signal in the signal capture stage is detected by multi-peak detection algorithm to determine the signal type. If it cannot be determined, the signal is detected by the half-peak full-width algorithm, so as to determine the signal type. In the stage of signal tracking, the Doppler shift of the spoofing signal is applied to determine whether the signal is spoofed or not. When the spoofing signal forwarding delay is set to 0.5 and 1 chip respectively, the full width of half peak is 8.56 and 11.35 after fitting the main peak. If the half-peak full width exceeds the normal navigation signal, it indicates spoofing interference. The constructed model can effectively track downspoofing signals and improve the Beidou navigation system’s detection performance.

Jiangtao Xu

Yajuan Guo

Daohua Zhu

Yunxiao Sun

Wei Huang

Xindong Zhao

A forwarding spoofing detection algorithm for Beidou navigation satellite system vulnerability

北斗导航卫星系统脆弱性转发欺骗检测算法

Abir Banerjee

Bappa Mukherjee

Kalachand Sain

Machine learning assisted model based petrographic classification: a case study from Bokaro coal field

机器学习辅助基于模型的岩相分类：来自博卡罗煤田的案例研究

Abbreviation	Acta Geod Geophys
Journal Impact	1.35
Quartiles(Global)	GEOCHEMISTRY & GEOPHYSICS(Q3)

ISSN	2213-5812, 2213-5820
h-index	25

Publication Information	Publisher: Akademiai Kiado，Publishing cycle: 4 issues per year，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2013，Proportion of original research papers: 100.00%，Self Citation Rate:0.00%， Gold OA Rate: 30.30%

Acta Geodaetica et Geophysica

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Multi-instrument analysis of F-region ionospheric irregularities suppression over South America during the November 3, 2021, geomagnetic storm

Planning, emphasis and proposal for implementation of gravimetric control network in Israel

Transformation from a global spherical to an adjusted local rectangular harmonic model

Delineation of hydrothermal alteration zones associated with mineral deposits, using remote sensing and airborne geophysics data. A case study: El-Bakriya area, Central Eastern Desert, Egypt

Using geophysical log data to predict the fracture density in a claystone host rock for storing high-level nuclear waste

Multi-instrument analysis of F-region ionospheric irregularities suppression over South America during the November 3, 2021, geomagnetic storm

Planning, emphasis and proposal for implementation of gravimetric control network in Israel

Selection of a calibration system for relative gravimeters and testing of the processing using the example of the Zhetygen calibration baseline in Kazakhstan

A forwarding spoofing detection algorithm for Beidou navigation satellite system vulnerability

Machine learning assisted model based petrographic classification: a case study from Bokaro coal field