scholarly journals Analysis of changes in the coordinates of the “Tavaksay” geodynamic polygon

2021 ◽  
Vol 310 ◽  
pp. 03002
Author(s):  
Erkin Mirmakhmudov ◽  
Vahidjon Niyazov ◽  
Vazira Makhamatova ◽  
Nozima Muminova
Keyword(s):  
Coordinate System ◽  
Covariance Matrix ◽  
Local Deformation ◽  
Time Interval ◽  
Navigation Systems ◽  
Laser Measurements ◽  
Deformation Processes ◽  
Spatial System ◽  
Gnss Measurements

This article presents the results of GNSS and laser measurements at the “Tavaksay” geodynamic polygon. Describes the classical methods for determining the change in coordinates based on triangulation and leveling. Ways to improve the accuracy of local microplate tectonics using navigation systems are outlined here.The coordinates of the benchmarks were calculated in the rectangular GaussKruger coordinate system and the spatial system B, L, H for CK42 and WGS84.The trilateration method for determining the distances between points of the geodynamic network is analyzed. An assessment of the accuracy of the coordinates of points and the distances between them, depending on the number of measurement cycles, has been made.The accuracy of the trilateration and GNSS method for this network is graphically presented. The diagonal elements of the covariance matrix of GNSS measurements are investigated. It is proposed to make homogeneous GNSS and laser measurements at the tops of the hills at a certain time interval to study local deformation processes.

scholarly journals ИССЛЕДОВАНИЕ ВОЗМОЖНОСТИ РЕГИСТРАЦИИ МЕДЛЕННЫХ ДЕФОРМАЦИОННЫХ ВОЛН ЛАЗЕРНЫМ ДЕФОРМОГРАФОМ

2019 ◽  
Author(s):  
I.Y. Rasskazov ◽  
V.A. Lugovoy ◽  
D.I. Tso
Keyword(s):  
Rock Mass ◽  
Experimental Research ◽  
Seismic Waves ◽  
Gulf Of Alaska ◽  
Rock Massif ◽  
Experimental Investigations ◽  
Correct Interpretation ◽  
Acoustic Activity ◽  
Laser Measurements ◽  
Deformation Processes

В статье представлены экспериментальные исследования по обнаружению медленных деформационных волн, интенсифицирующих геомеханические процессы в массиве горных пород, с применением высокочувствительных лазерных измерений. Проведены результаты экспериментальных исследований по оценке влияния удаленных землетрясений на состояние горного массива Стрельцовского рудного поля, регистрации удаленных землетрясений и их предвестников. Приведены результаты регистрации землетрясения в заливе Аляска. Установлено влияние удаленных землетрясений на акустическую активность горного массива, которое проявляется в виде значительного увеличения количества акустических событий и их энергии после регистрации сейсмической волны. Выявлено, что наличие деформационных и сейсмических волн от удаленных землетрясений можно отнести к дополнительным факторам, инициирующим деформационные процессы в горном массиве. Своевременная регистрация данных волн и корректная их интерпретация позволят значительно повысить достоверность прогноза энергетических геодинамических событий в удароопасных массивах горных пород при разработке месторождений в целях предотвращения катастрофических событий.The article presents experimental investigations on the detection of slow waves intensifying geomechanical processes in rock massif, with the application of highsensitivity laser measurements. The results of experimental research for the evaluation of remote earthquakes impact on the condition of rock massif of Streltsovskoe ore field, registration of remote earthquakes and their forerunners are given. The results of the earthquake in the Gulf of Alaska, is represented in the article. The influence of distant earthquakes on the rock mass acoustic activity, which manifests itself in the form of a significant increase in the number of acoustic events and their energy after the registration of a seismic wave, is established. It is revealed that the presence of deformation and seismic waves from distant earthquakes can be attributed to additional factors that initiate deformation processes in the rock massif. Timely recording of these waves and their correct interpretation will significantly improve the accuracy of the prediction of energy geodynamic events in shockhazardous rock masses when developing fields in order to prevent catastrophic events.

scholarly journals Verification of GNSS Measurements of the Railway Track Using Standard Techniques for Determining Coordinates

2020 ◽  
Vol 12 (18) ◽  
pp. 2874 ◽  
Author(s):  
Cezary Specht ◽  
Andrzej Wilk ◽  
Wladyslaw Koc ◽  
Krzysztof Karwowski ◽  
Paweł Dąbrowski ◽  
...  
Keyword(s):  
Measuring System ◽  
Railway Track ◽  
Satellite Measurements ◽  
Railway Line ◽  
University Of Technology ◽  
Railway Infrastructure ◽  
Spatial System ◽  
Mobile Satellite ◽  
Gnss Measurements ◽  
Geometric Layout

The problem of the reproduction of the railway geometric layout in the global spatial system is currently solved in the form of measurements that use geodetic railway networks and also, in recent years, efficient methods of mobile positioning (mainly satellite and inert). The team of authors from the Gdańsk University of Technology and the Maritime University in Gdynia as part of the research project InnoSatTrack is looking for effective and efficient methods for the inventory of railway lines. The research is part of a wider investigation BRIK (Research and Development in Railway Infrastructure, in polish: Badania i Rozwój w Infrastrukturze Kolejowej). This paper presents a comparative analysis of the problem of the reproduction of the trajectory of the measuring system using tacheometry, satellite measurements made using a measurement trolley, and mobile satellite measurements. Algorithms enabling the assessment of the compliance of satellite measurements with classic tacheometric measurements were presented. To this end, the authors held measurement sessions using modern geodetic instruments and satellite navigation on a section of the railway line. The results of the measurements indicate the convergence of the level of accuracy achieved by different measuring techniques.

scholarly journals Structural transitions and local deformation processes at and near grain boundaries

JOM ◽  
2009 ◽  
Vol 61 (12) ◽  
pp. 37-37
Author(s):  
T. R. Bieler ◽  
R. Barabash ◽  
S. W. Banovic
Keyword(s):  
Grain Boundaries ◽  
Local Deformation ◽  
Structural Transitions ◽  
Deformation Processes

scholarly journals ZUPT-aided INS Bypassing Stance Phase Detection by Using Foot-Instability-Based Adaptive Covariance

2021 ◽  
Author(s):  
Chi-Shih Jao ◽  
Andrei M. Shkel
Keyword(s):  
Covariance Matrix ◽  
Stance Phase ◽  
Phase Detector ◽  
Vertical Position ◽  
Navigation Systems ◽  
Phase Detection ◽  
Zero Velocity ◽  
Position Errors ◽  
Series Of Experiments ◽  
Navigation Accuracy

<p>In this paper, we propose a Foot-Instability-Based Adaptive (FIBA) covariance to dynamically adjust the covariance matrix for the pseudo-zero-velocity measurements in the Zero velocity UPdaTe (ZUPT)-aided Inertial Navigation Systems (INS). The proposed ZUPT-aided INS using the FIBA covariance is implemented in an Adaptive Extended Kalman Filter (AEKF) framework, where the measurement covariance matrix is updated in each iteration according to the FIBA covariance. The FIBA covariance is designed to have a very high value during the swing phases in a gait cycle, and the value significantly decreases during the stance phases. As a result, the proposed method eliminates a need to use a binary stance phase detector in implementation of the ZUPT-aided INS. Two series of indoor pedestrian navigation experiments were conducted to investigate the navigation performance of the algorithm. In the first series of experiments, which included cases of walking and running, localization solutions produced by the system using the FIBA covariance demonstrated 36% and 64% improvements in navigation accuracy along the horizontal and vertical directions, respectively. In the second series of experiments, which included a pedestrian walking on different indoor terrains, such as flat planes, stairs, and ramps, the navigation accuracy of the system using the FIBA covariance reduced horizontal and vertical position errors by 12% and 45%, respectively, as compared to the conventional ZUPT-aided INS.</p>

scholarly journals Local Deformation of Glasses Is Mediated by Rigidity Fluctuation and Granularity

2018 ◽  
Author(s):  
Omar Benzine ◽  
Sebastian Bruns ◽  
Zhiwen Pan ◽  
Karsten Durst ◽  
Lothar Wondraczek
Keyword(s):  
Defect Formation ◽  
Low Frequency ◽  
Vitreous Silica ◽  
Local Deformation ◽  
Molecular Heterogeneity ◽  
Length Scale ◽  
Deformation Processes ◽  
Microscopic Deformation ◽  
Glass Surfaces ◽  
Inorganic Glasses

Microscopic deformation processes lie at the origin of defect formation on glass surfaces, thus determining the material’s resistance to scratching and mechanical failure. While the macroscopic strength of most glasses is not directly depending on material composition, local deformation and flaw initiation are strongly affected by chemistry and atomic arrangement. Aside empirical insight, however, the structural origin of the fundamental deformation modes remains largely unknown. Experimental methods which probe parameters on short or intermediate length-scale such as atom-atom or super-structural correlations are typically applied in the absence of alternatives. Drawing on recent experimental advances, we now probe spatial variations in the low-frequency vibrational density of states which result from sharp contact deformation of vitreous silica. From direct observation of deformation-induced variations on the characteristic length-scale of molecular heterogeneity, we argue that rigidity fluctuation on the scale of a few nanometers governs the deformation process of inorganic glasses.

scholarly journals THE ISSUE OF LS-OPTIMIZATION SATELLITE GEODETIC NETWORKS IN THE TERRESTRIAL COORDINATE SYSTEM

2020 ◽  
Vol 1 (1) ◽  
pp. 120-128
Author(s):  
Vladimir A. Padve ◽  
Nikolay S. Kosarev
Keyword(s):  
Coordinate System ◽  
Spatial Data ◽  
Computational Experiment ◽  
Satellite Network ◽  
Geodetic Networks ◽  
Measurement Results ◽  
Gnss Measurements ◽  
Parametric Version ◽  
New Item

The issue of processing GNSS measurements performed to add a new item into a "hard" network is discussed. Two variants of this add: «beam» and «network» are compared. A fragment of the satellite network, which includes five "hard" points of the main network and one defined, acted as the object on which the computational experiment was carried out, testing the theory of this question. The processing of observational materials is implemented in to Excel electronic computational table using an algorithm synthesized version of the parametric version of LS-optimization of spatial data. The «insert» coordinates obtained as a result of this processing and their average square errors were identical for both variants, which is what follows from the theory of LS-optimization of measurement results taking into account of the errors of the coordinates of «hard» points.

scholarly journals Nationwide deformation monitoring with SqueeSAR® using Sentinel-1 data

2020 ◽  
Vol 382 ◽  
pp. 31-37
Author(s):  
Christine A. Bischoff ◽  
Alessandro Ferretti ◽  
Fabrizio Novali ◽  
Andrea Uttini ◽  
Chiara Giannico ◽  
...  
Keyword(s):  
Relevant Information ◽  
Local Deformation ◽  
Deformation Monitoring ◽  
Sar Image ◽  
National Scale ◽  
Regional Deformation ◽  
Spatial Coverage ◽  
Gnss Measurements

Abstract. Subsidence can now be routinely mapped on a national scale thanks to ESA's Sentinel-1 sensors and advanced scalable SqueeSAR® processing. In order to be integrated into existing monitoring programmes, the SqueeSAR® datasets can be calibrated with GNSS measurements. The dense spatial coverage of SqueeSAR® deformation maps captures local deformation phenomena, and with appropriate calibration, can advance the understanding of regional deformation trends. The regular and reliable SAR image acquisitions by Sentinel-1, as well as significant improvements in the scalability of SqueeSAR® processing allow regular updates of deformation maps on a national scale. Filtering the large amount of data for relevant information is achieved by using an algorithm to detect changes in displacement trends.

scholarly journals Results of the study of the geodynamics of the Ossetian part of the Central Caucasus based on satellite geodesy and regional seismicity data

2021 ◽  
Author(s):  
В.Н. Дробышев ◽  
Х.М. Хубаев ◽  
Х.З. Торчинов
Keyword(s):  
Energy Distribution ◽  
Coordinate System ◽  
Geophysical Methods ◽  
Seismic Energy ◽  
Local Deformation ◽  
Regional Seismicity ◽  
Central Caucasus ◽  
Mathematical Processing ◽  
Geological And Geophysical Methods ◽  
Tectonic Scheme

В результате проведённой работы была получена информация о геодинамическом поведении ос- новных тектонических блоков Земной коры (ЗК) в границах Горной Осетии. Принимая полученную информацию как первичную, в рамках данной работы продемонстрировано несколько методических приёмов по её матема- тической обработке. В частности, приёмы интерполяции дискретно представленных данных позволили вы- полнить построение поля скоростей GPS-пунктов в условной системе координат, проведено сопоставление его с полем распределения сейсмической энергии по территории. Выявленные локальные деформационные аномалии ЗК логично вписываются в тектоническую схему региона, установленную независимыми геологиче- скими и геофизическими методами. As a result of the work carried out, information was obtained on the geodynamic behavior of the main tectonic blocks of the Earth’s crust (GC) within the boundaries of Mountainous Ossetia. Taking the information received as primary, within the framework of this work, several methodological techniques for its mathematical processing are demonstrated. In particular, the methods of interpolation of discretely presented data made it possible to construct the velocity fi eld of GPS points in a conventional coordinate system, and compare it with the fi eld of seismic energy distribution over the territory. The identifi ed local deformation anomalies of the ZK logically fi t into the tectonic scheme of the region, established by independent geological and geophysical methods.

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