 Subjects -> INSTRUMENTS (Total: 62 journals)
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- Single point positioning with vertical total electron content estimation
based on single-epoch data
Abstract: Single point positioning with vertical total electron content estimation based on single-epoch data
Artur Fischer, Sławomir Cellmer, and Krzysztof Nowel
Geosci. Instrum. Method. Data Syst., 10, 1–12, https://doi.org/10.5194/gi-10-1-2021, 2021
A simple and autonomous ionospheric correction estimation method in SPP allows independence from external products delivering information on the ionospheric delay. The elaborated mathematical model improves navigation solutions in reference to the SPP approach with the Klobuchar algorithm and ensures results on a similar level compared to the IGS TEC map. The numerical experiment was carried out utilizing real GNSS code data and a MATLAB environment.
PubDate: 2021-01-11T23:46:21+01:00
- Suppression of very low frequency radio noise in
transient
electromagnetic data with semi-tapered gates
Abstract: Suppression of very low frequency radio noise in transientelectromagnetic data with semi-tapered gates
Jakob Juul Larsen, Stine Søgaard Pedersen, Nikolaj Foged, and Esben Auken
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-49,2020
Preprint under review for GI (discussion: open, 0 comments)
The transient electromagnetic method (TEM) is widely used for mapping subsurface resistivity structures but data are inevitably contaminated by noise from various sources including radio signals in the very low frequency (VLF) 3–30 kHz band. We present an approach where VLF noise is effectively suppressed with a new post-processing scheme where boxcar gates are combined into semi-tapered gates. The result is a 20 % increase of depth of investigation for the presented test survey.
PubDate: 2020-12-28T21:39:08+01:00
- Radiation tolerance of the PNI RM3100 magnetometer for a Europa lander
mission
Abstract: Radiation tolerance of the PNI RM3100 magnetometer for a Europa lander mission
Leonardo H. Regoli, Mark B. Moldwin, Connor Raines, Tom A. Nordheim, Cameron A. Miller, Martin Carts, and Sara A. Pozzi
Geosci. Instrum. Method. Data Syst., 9, 499–507, https://doi.org/10.5194/gi-9-499-2020, 2020
One of the four Galilean moons of Jupiter, Europa, is one of the most promising places in the solar system to find life outside Earth. For this reason, the space science community is currently focused on exploring it. One of the main difficulties of such a task is the harsh radiation environment caused by the radiation belts of Jupiter. In this paper, we present results for a magnetic field sensor being exposed to radiation levels similar to those expected at the surface of Europa.
PubDate: 2020-12-23T14:33:42+01:00
- Ground-penetrating radar inspection of subsurface historical structures at
the baptism (El-Maghtas) site, Jordan
Abstract: Ground-penetrating radar inspection of subsurface historical structures at the baptism (El-Maghtas) site, Jordan
AbdEl-Rahman Abueladas and Emad Akawwi
Geosci. Instrum. Method. Data Syst., 9, 491–497, https://doi.org/10.5194/gi-9-491-2020, 2020
In this research, we applied a ground-penetrating radar (GPR) approach for excavating the ancient archeological baptism site of the Jordan River. The GPR survey was carried out at representative locations along parallel profiles using a subsurface interface radar system. The GPR profiles revealed multiple subsurface anomalies across the study area. Many features were detected in the study area, such as a buried wall, channels and a pottery pipe at the Elijah's Hill site.
PubDate: 2020-12-22T14:33:42+01:00
- Using near-surface atmospheric measurements as a proxy for quantifying
field-scale soil gas flux
Abstract: Using near-surface atmospheric measurements as a proxy for quantifying field-scale soil gas flux
Andrew Barkwith, Stan E. Beaubien, Thomas Barlow, Karen Kirk, Thomas R. Lister, Maria C. Tartarello, and Helen Taylor-Curran
Geosci. Instrum. Method. Data Syst., 9, 483–490, https://doi.org/10.5194/gi-9-483-2020, 2020
Soil gas flux describes the movement of various gases either to or from the ground. Identifying changes in soil gas flux can lead to a better understanding and detection of leakage from carbon capture and storage (CCS) schemes, diffuse degassing in volcanic and geothermal areas, and greenhouse gas emissions. Traditional chamber-based techniques may require weeks of fieldwork to assess a site. We present a new method to speed up the assessment of diffuse leakage.
PubDate: 2020-12-18T13:35:43+01:00
- Analysis of the Geomagnetic Component Z Daily
Variation Amplitude Based
on the China Geomagnetic
Network
Abstract: Analysis of the Geomagnetic Component Z DailyVariation Amplitude Based on the China GeomagneticNetwork
Xudong Zhao, Yufei He, Qi Li, and Xiaocan Liu
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-48,2020
Preprint under review for GI (discussion: open, 0 comments)
The daily variation amplitude of geomagnetic component Z could represent the diurnal variation strength of geomagnetic field. The ionospheric conductivity, neutral wind in ionosphere and the complicated underground electrical structures make combined action to effect the feature of the Z daily variation amplitude in China. This paper will provide the background information or reference to researchers who study the geomagnetic diurnal variation or to analyse the anomaly.
PubDate: 2020-12-17T13:35:43+01:00
- Mathematical foundation of Capon's method for planetary magnetic field
analysis
Abstract: Mathematical foundation of Capon's method for planetary magnetic field analysis
Simon Toepfer, Yasuhito Narita, Daniel Heyner, Patrick Kolhey, and Uwe Motschmann
Geosci. Instrum. Method. Data Syst., 9, 471–481, https://doi.org/10.5194/gi-9-471-2020, 2020
The Capon method serves as a powerful and robust data analysis tool when working on various kinds of ill-posed inverse problems. Besides the analysis of waves, the method can be used in a generalized way to compare actual measurements with theoretical models, such as Mercury's magnetic field analysis. In view to the BepiColombo mission this work establishes a mathematical basis for the application of Capon's method to analyze Mercury's internal magnetic field in a robust and manageable way.
PubDate: 2020-12-16T13:35:43+01:00
- Magnetic interference mapping of four types of unmanned aircraft
systems
intended for aeromagnetic surveying
Abstract: Magnetic interference mapping of four types of unmanned aircraftsystems intended for aeromagnetic surveying
Loughlin E. Tuck, Claire Samson, Jeremy Laliberté, and Michael Cunningham
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-38,2020
Preprint under review for GI (discussion: open, 0 comments)
This paper presents a novel method for locating magnetic interference sources on unmanned aircraft systems (UAS) destined for aeromagnetic surveys. The technique is demonstrated in an indoor laboratory whereas most magnetic mapping has previously been done outdoors and is performed on 4 different types of UAS with their motors engaged. Sources are discussed on each UAS platform, but can also be used as a point of reference for typical components that cause interference.
PubDate: 2020-12-15T10:39:30+01:00
- Maximum-variance gradiometer technique for removal of spacecraft-generated
disturbances from magnetic field data
Abstract: Maximum-variance gradiometer technique for removal of spacecraft-generated disturbances from magnetic field data
Ovidiu Dragoş Constantinescu, Hans-Ulrich Auster, Magda Delva, Olaf Hillenmaier, Werner Magnes, and Ferdinand Plaschke
Geosci. Instrum. Method. Data Syst., 9, 451–469, https://doi.org/10.5194/gi-9-451-2020, 2020
We propose a gradiometer-based technique for cleaning multi-sensor magnetic field data acquired on board spacecraft. The technique takes advantage on the fact that the maximum-variance direction of many AC disturbances on board spacecraft does not change over time. We apply the proposed technique to the SOSMAG instrument on board GeoKompsat-2A. We analyse the performance and limitations of the technique and discuss in detail how various disturbances are removed.
PubDate: 2020-12-11T13:10:51+01:00
- Low Z Elements of High Grade Metamorphic Rocks by PIXE Analysis – A
Comprehensive Review
Abstract: Low Z Elements of High Grade Metamorphic Rocks by PIXE Analysis – A Comprehensive Review
Avupati Venkata Surya Satyanarayana, Mokka Jagannadha Rao, and Byreddy Seetharami Reddy
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-40,2020
Preprint under review for GI (discussion: open, 0 comments)
This study proves how the experimental results coincide with theoretical factors of LE-PIXE in case of High Grade Metamorphic Rocks and calibration of Si (Li) detector in case of low Z elements for future research. The Experimental parameters behind the low Z elements and also the developments of the same LE-PIXE by alter the various parameters and the complementary techniques which will be required for low energy X-rays emitted from low Z.
PubDate: 2020-12-10T13:10:51+01:00
- Vibration error compensation algorithm in the development of the laser
interference absolute gravimeter
Abstract: Vibration error compensation algorithm in the development of the laser interference absolute gravimeter
Qiong Wu, Yuntian Teng, Xiaomei Wang, Yanxiong Wu, and Yang Zhang
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-33,2020
Preprint under review for GI (discussion: open, 0 comments)
Laser interference absolute gravimeters are high-precision gravimetry instruments. However, The error caused by self-sysetm and enviromental vibration has become the primary obstacle limiting its accuracy and stability. The present work addresses this issue by proposing a global search optimization algorithm that determines the optimal absolute value of gravity. The results evaluated by numerical calculations demonstrate that this algorithm provides a substantial anti-vibration capability.
PubDate: 2020-11-27T08:34:51+01:00
- The baseline wander correction based on the improved ensemble empirical
mode decomposition (EEMD) algorithm for grounded electrical source
airborne transient electromagnetic signals
Abstract: The baseline wander correction based on the improved ensemble empirical mode decomposition (EEMD) algorithm for grounded electrical source airborne transient electromagnetic signals
Yuan Li, Song Gao, Saimin Zhang, Hu He, Pengfei Xian, and Chunmei Yuan
Geosci. Instrum. Method. Data Syst., 9, 443–450, https://doi.org/10.5194/gi-9-443-2020, 2020
The baseline wander has special characteristics, such as being low frequency, large amplitude, non-periodic, and non-stationary. It is caused by the receiving coil motion and always exists in the process of data acquisition. The proposed method can be used to solve similar problems. This paper has the following highlights: (1) the method can be used to process non-periodic and non-stationary signals; (2) the method is adaptive to satisfy the stopping criterion based on the measured signal.
PubDate: 2020-11-16T00:28:11+01:00
- Appraisal on inversion algorithm techniques in 2D electrical resistivity
tomography survey data for poised mapping of subsurface features
Abstract: Appraisal on inversion algorithm techniques in 2D electrical resistivity tomography survey data for poised mapping of subsurface features
Abhay Kumar Bharti, Amar Prakash, and Krishna Kant Kumar Singh
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-25,2020
Preprint under review for GI (discussion: open, 0 comments)
Analysis of non-uniqueness model in resistivity imaging data is vital in inaugurating the consistency of models. Nevertheless, such analysis is moderately unusual in resistivity imaging data set. Electrical resistivity tomography (ERT) technique is being constantly used in many scientific areas including engineering, environmental and archaeological survey.
PubDate: 2020-11-16T00:28:11+01:00
- Easy to build low-power GPS drifters with local storage and a cellular
modem made from off-the-shelf components
Abstract: Easy to build low-power GPS drifters with local storage and a cellular modem made from off-the-shelf components
Rolf Hut, Thanda Thatoe Nwe Win, and Thom Bogaard
Geosci. Instrum. Method. Data Syst., 9, 435–442, https://doi.org/10.5194/gi-9-435-2020, 2020
GPS drifters that float down rivers are important tools in studying rivers, but they can be expensive. Recently, both GPS receivers and cellular modems have become available at lower prices to tinkering scientists due to the rise of open hardware and the Arduino. We provide detailed instructions on how to build a low-power GPS drifter with local storage and a cellular model that we tested in a fieldwork in Myanmar. These instructions allow fellow geoscientists to recreate the device.
PubDate: 2020-11-05T18:12:58+01:00
- Daytime and nighttime aerosol optical depth implementation in CÆLIS
Abstract: Daytime and nighttime aerosol optical depth implementation in CÆLIS
Ramiro González, Carlos Toledano, Roberto Román, David Fuertes, Alberto Berjón, David Mateos, Carmen Guirado-Fuentes, Cristian Velasco-Merino, Juan Carlos Antuña-Sánchez, Abel Calle, Victoria E. Cachorro, and Ángel M. de Frutos
Geosci. Instrum. Method. Data Syst., 9, 417–433, https://doi.org/10.5194/gi-9-417-2020, 2020
Aerosol optical depth (AOD) is a parameter widely used in remote sensing for the characterization of atmospheric aerosol particles. AERONET was created by NASA for aerosol monitoring as well as satellite and model validation. The University of Valladolid (UVa) has managed an AERONET calibration center since 2006. The CÆLIS software tool, developed by UVa, was created to manage the data generated by AERONET photometers. The AOD algorithm in CÆLIS is developed and validated in this work.
PubDate: 2020-11-05T18:12:58+01:00
- Design and Implementation of the Detection Software of
Wireless
Microseismic Acquisition Station Based on Android Platform
Abstract: Design and Implementation of the Detection Software of WirelessMicroseismic Acquisition Station Based on Android Platform
Qimao Zhang, Shuaiqing Qiao, Qisheng Zhang, and Shiyang Liu
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-36,2020
Preprint under review for GI (discussion: open, 0 comments)
We believe that this contribution is theoretically and practically relevant because the proposed technology in this paper have been applied to the corresponding engineering and technology exploration. Our research has certain reference value for oil and gas exploration and natural seismic monitoring, who comprise the majority of your journal’s readers. Further, we believe that the findings match the aims and scope of your journal.
PubDate: 2020-11-04T18:12:58+01:00
- Overview of the main radiation transport codes
Abstract: Overview of the main radiation transport codes
Nikolaos Schetakis, Rodrigo Crespo, José Luis Vázquez-Poletti, Mariano Sastre, Luis Vázquez, and Alessio Di Iorio
Geosci. Instrum. Method. Data Syst., 9, 407–415, https://doi.org/10.5194/gi-9-407-2020, 2020
In this paper, we present a compilation of the different radiation transport codes for the Martian surface that are currently used by various space agencies and institutions. In addition, as the execution of the tasks necessary to process all of these radiation data requires a high computational processing capacity, we link it to cloud computing, which is found to be an appropriate tool regarding the required resources.
PubDate: 2020-10-27T00:48:25+01:00
- Evaluation of Climate Change Impact on Extreme Temperature Variability in
the Blue Nile Basin, Ethiopia
Abstract: Evaluation of Climate Change Impact on Extreme Temperature Variability in the Blue Nile Basin, Ethiopia
Mostafa A. Mohamed and Mohamed El-Sayed El-Mahdy
Geosci. Instrum. Method. Data Syst. Discuss., https://doi.org/10.5194/gi-2020-34,2020
Preprint under review for GI (discussion: open, 0 comments)
Blue Nile Basin is of vital importance for the whole Nile Basin. The investigation of the impact of climate change on this basin is a must. Blue Nile Basin annual and monthly temperatures were investigated. Spatial and temporal patterns of changes in extreme temperatures are investigated using 10 meteorological stations data for the period 1950–2018. The investigation showed that climate change has a negative impact on the basin in terms of temperature.
PubDate: 2020-10-19T18:34:19+02:00
- CITYZER observation network and data delivery system
Abstract: CITYZER observation network and data delivery system
Walter Schmidt, Ari-Matti Harri, Timo Nousiainen, Harri Hohti, Lasse Johansson, Olli Ojanperä, Erkki Viitala, Jarkko Niemi, Jani Turpeinen, Erkka Saukko, Topi Rönkkö, and Pekka Lahti
Geosci. Instrum. Method. Data Syst., 9, 397–406, https://doi.org/10.5194/gi-9-397-2020, 2020
Combining short-time forecast models, standardized interfaces to a wide range of environment detectors and a flexible user access interface, CITYZER provides decision-making authorities and private citizens with reliable information about the near-future development of critical environmental parameters like air quality and rain. The system can be easily adapted to different areas or different parameters. Alarms for critical situations can be set and used to support authority decisions.
PubDate: 2020-10-13T13:05:24+02:00
- Dense point cloud acquisition with a low-cost Velodyne VLP-16
Abstract: Dense point cloud acquisition with a low-cost Velodyne VLP-16
Jason Bula, Marc-Henri Derron, and Gregoire Mariethoz
Geosci. Instrum. Method. Data Syst., 9, 385–396, https://doi.org/10.5194/gi-9-385-2020, 2020
We developed a method to acquire dense point clouds with a low-cost Velodyne Puck lidar system, without using expensive Global Navigation Satellite System (GNSS) positioning or IMU. We mounted the lidar on a motor to continuously change the scan direction, leading to a significant increase in the point cloud density. The system was compared with a more expensive system based on IMU registration and a SLAM algorithm. The alignment between acquisitions with those two systems is within 2 m.
PubDate: 2020-10-12T08:06:52+02:00
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