scholarly journals Determination of the Stability of High-Steep Slopes by Global Navigation Satellite System (GNSS) Real-Time Monitoring in Long Wall Mining

2020 ◽  
Vol 10 (6) ◽  
pp. 1952 ◽  
Author(s):  
Xugang Lian ◽  
Zoujun Li ◽  
Hongyan Yuan ◽  
Haifeng Hu ◽  
Yinfei Cai ◽  
...  
Keyword(s):  
Real Time ◽  
Global Navigation Satellite System ◽  
Satellite System ◽  
Slope Movement ◽  
Navigation Satellite ◽  
Real Time Monitoring ◽  
Uniform Deformation ◽  
Working Face ◽  
Global Navigation Satellite ◽  
Steep Slopes

Surface movement and deformation induced by underground coal mining causes slopes to collapse. Global Navigation Satellite System (GNSS) real-time monitoring can provide early warnings and prevent disasters. A stability analysis of high-steep slopes was conducted in a long wall mine in China, and a GNSS real-time monitoring system was established. The moving velocity and displacement at the monitoring points were an integrated response to the influencing factors of mining, topography, and rainfall. Underground mining provided a continuous external driving force for slope movement, the steep terrain provided sufficient slip conditions in the slope direction, and rainfall had an acceleration effect on slope movement. The non-uniform deformation, displacement field, and time series images of the slope body revealed that ground failure was concentrated in the area of non-uniform deformation. The non-uniform deformation was concentrated ahead of the working face, the speed of deformation behind the working face was reduced, the instability of the slope body was increased, and the movement of the top of the slope was larger than at the foot. The high-steep slope stability in the mine was influenced by the starting deformation (low stability), iso-accelerated deformation (increased stability), deformation deceleration (reduced stability), and deformation remaining unchanged (improved stability).

APLICAÇÃO DE GEOTECNOLOGIAS NA ANÁLISE DE VIABILIDADE TÉCNICA E ECONÔMICA DO PROJETO DE IMPLANTAÇÃO DO IFMA - CAMPUS ITAQUI-BACANGA.

2021 ◽  
Vol 14 (2) ◽  
pp. 105
Author(s):  
Maelckson Bruno Barros Gomes ◽  
André Luis Silva Santos
Keyword(s):  
Real Time ◽  
Global Navigation Satellite System ◽  
Satellite System ◽  
Navigation Satellite ◽  
Real Time Kinematic ◽  
Global Navigation ◽  
Global Navigation Satellite

<p class="04CorpodoTexto">Este artigo tem por objetivo aplicar geotecnologias para obtenção de informações planialtimétricas a fim de avaliar a viabilidade de implantação do campus Centro Histórico/Itaqui-Bacanga do IFMA. Considerando que para realização de levantamento por métodos tradicionais é recomendado que seja realizado o destocamento e a limpeza do terreno previamente, avaliou-se a realização do levantamento planialtimétrico a partir de um par de receptores <em>Global Navigation Satellite System</em> (GNSS) pelo método <em>Real Time Kinematic</em> (RTK) pós processado e também a partir da realização de levantamento fotogramétrico, utilizando aeronave remotamente pilotada (ARP), popularmente conhecida como drone. Esta análise permitiu demonstrar que o aerolevantamento com a ARP pode ser aplicado na concepção inicial de um projeto de engenharia, conforme classificação do Tribunal de Contas da União (TCU) para níveis de precisão, pois obteve-se uma diferença orçamentária de 19% entre os projetos elaborados a partir das duas geotecnologias.</p><div> </div>

scholarly journals Corrigendum to: Using global navigation satellite system data for real-time moisture analysis and forecasting over the Australian region I. The system

2020 ◽  
Vol 70 (1) ◽  
pp. 394
Author(s):  
John Le Marshall ◽  
Robert Norman ◽  
David Howard ◽  
Susan Rennie ◽  
Michael Moore ◽  
...  
Keyword(s):  
High Resolution ◽  
Data Assimilation ◽  
Real Time ◽  
Global Navigation Satellite System ◽  
Satellite System ◽  
Navigation Satellite ◽  
Australian Region ◽  
Moisture Analysis ◽  
Global Navigation Satellite ◽  
Resolution Data

The use of high spatial and temporal resolution data assimilation and forecasting around Australia’s capital cities and rural land provided an opportunity to improve moisture analysis and forecasting. To support this endeavour, RMIT University and Geoscience Australia worked with the Bureau of Meteorology (BoM) to provide real-time GNSS (global navigation satellite system) zenith total delay (ZTD) data over the Australian region, from which a high-resolution total water vapour field for SE Australia could be determined. The ZTD data could play an important role in high-resolution data assimilation by providing mesoscale moisture data coverage from existing GNSS surface stations over significant areas of the Australian continent. The data were used by the BoM’s high-resolution ACCESS-C3 capital city numerical weather prediction (NWP) systems, the ACCESS-G3 Global system and had been used by the ACCESS-R2-Regional NWP model. A description of the data collection and analysis system is provided. An example of the application of these local GNSS data for a heavy rainfall event over SE Australia/Victoria is shown using the 1.5-km resolution ACCESS-C3 model, which was being prepared for operational use. The results from the test were assessed qualitatively, synoptically and also examined quantitatively using the Fractions Skills Score which showed the reasonableness of the forecasts and demonstrated the potential for improving rainfall forecasts over south-eastern Australia by the inclusion of ZTD data in constructing the moisture field. These data have been accepted for operational use in NWP.

scholarly journals Situational Awareness: Mapping Interference Sources in Real-Time Using a Smartphone App

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4130 ◽  
Author(s):  
Hong Nguyen ◽  
Micaela Troglia Gamba ◽  
Emanuela Falletti ◽  
Tung Ta
Keyword(s):  
Real Time ◽  
Global Navigation Satellite System ◽  
Situational Awareness ◽  
Satellite System ◽  
Smartphone App ◽  
Navigation Satellite ◽  
The Past ◽  
Global Navigation ◽  
Global Navigation Satellite

In the past years, many techniques have been researched and developed to detect and identify the interference sources of Global Navigation Satellite System (GNSS) signals. In this paper, we utilize a simple and portable application to map interference sources in real-time. The results are promising and show the potential of the crowdsourcing for monitoring and mapping GNSS interference distribution.

scholarly journals PAU/GNSS-R: Implementation, Performance and First Results of a Real-Time Delay-Doppler Map Reflectometer Using Global Navigation Satellite System Signals

Sensors ◽  
2008 ◽  
Vol 8 (5) ◽  
pp. 3005-3019 ◽  
Author(s):  
Juan Marchan-Hernandez ◽  
Adriano Camps ◽  
Nereida Rodriguez-Alvarez ◽  
Xavier Bosch-Lluis ◽  
Isaac Ramos-Perez ◽  
...  
Keyword(s):  
Time Delay ◽  
Real Time ◽  
Global Navigation Satellite System ◽  
Satellite System ◽  
Navigation Satellite ◽  
First Results ◽  
Global Navigation ◽  
Global Navigation Satellite

scholarly journals Construcción de la superficie hidrográfica de referencia vertical para las bahías de Buenaventura y Málaga, Pacífico colombiano

2018 ◽  
pp. 53-69 ◽  
Author(s):  
Merly Constanza Álvarez Machuca ◽  
Diego Armando Pulido Nossa ◽  
Leidy Janeth Solano Trullo ◽  
Fernando Oviedo Barrero
Keyword(s):  
Real Time ◽  
Global Navigation Satellite System ◽  
Satellite System ◽  
Navigation Satellite ◽  
Geodetic System ◽  
Real Time Kinematic ◽  
Global Navigation ◽  
Global Navigation Satellite

El presente artículo define la ruta metodológica usada en el proyecto “Red Hidrográfica de Referencia Vertical para los principales puertos marítimos Colombianos”, durante la generación del marco vertical de referencia denominado “Superficie Hidrográfica de Referencia Vertical (SHRV2016)” para las bahías de Buenaventura y Málaga en el Pacífico Colombiano, a partir de tres componentes principales: la determinación matemática de datums verticales asociados a registros históricos de nivel de agua, el establecimiento de una red de vértices geodésicos de primer orden, y la medición de alturas en la superficie del mar con referencia al elipsoide WGS84 (World Geodetic System), empleando receptores del sistema GNSS (Global Navigation Satellite System) en modo diferencial RTK (Real Time kinematic). Los puntos de referencia en tierra fueron utilizados para dar el control vertical de precisión hacia los datums en el agua, y a su vez para la instalación de receptores base GNSS encargados de enviar las correcciones diferenciales en tiempo real durante la medición de alturas en la superficie del mar; Estas mediciones junto a la densificación de datums verticales calculados para la zona, constituyeron la base en la elaboración de la SHRV2016, modelo que con una resolución espacial de 500 metros, refiere al elipsoide WGS84 los datums verticales de nivel de agua, y que además de estandarizar las mediciones que realizan los diferentes usuarios en las aguas jurisdiccionales relativas a un datum vertical; permite aprovechar las ventajas de la tecnología GNSS para realizar la medición y corrección de nivel de agua en tiempo real con el menor grado de incertidumbre posible durante la ejecución de levantamientos hidrográficos, optimizando tiempo, calidad y recursos, especialmente en lugares como las Bahías de Buenaventura y Málaga, donde el régimen de marea hace compleja la actividad de corrección debido a la variabilidad en rango y fase propia del sector, lo cual obliga a instalar múltiples estaciones mareográficas, realizar tareas de topografía y geodesia en lugares de difícil acceso, y esperar al termino del levantamiento hidrográfico para incluir los registros de las estaciones en la corrección final de las profundidades. En un mediano plazo, las SHRV permitirán la generación de un modelo completo de referencia de los datums de marea hacia el elipsoide, que abarque completamente los litorales y regiones insulares del país, hasta los límites del mar territorial, gracias a la combinación con datos de altimetría satelital e instrumentos de observación mar adentro como boyas GPS, que permitan la correcta fusión con los modelos generados a nivel local en cada una de las bahías y puertos.

scholarly journals Purwarupa Differential Global Navigation Satellite System dengan Metode Real Time Kinematik Berbasis Radio Link Type Htox

2021 ◽  
Vol 6 (1) ◽  
pp. 8-13
Author(s):  
Surono Surono ◽  
Adhi Kusuma Negara ◽  
Endro Sigit Kurniawan
Keyword(s):  
Real Time ◽  
Global Navigation Satellite System ◽  
Carrier Phase ◽  
Satellite System ◽  
Radio Link ◽  
Navigation Satellite ◽  
Raw Data ◽  
Link Type ◽  
Global Navigation ◽  
Global Navigation Satellite

Purwarupa Differential Global Navigation Satellite System bertujuan untuk meningkatkan akurasi dari receiver GNSS, dengan menambahkan referensi stasiun lokal untuk menambah informasi yang diterima dari satelit. Differential Global Navigation Satellite System ini menggunakan metode real time kinematik yang berbasiskan pada carrier phase (besaran sudut) dalam penentuan posisi data secara relatif dengan tingkat ketelitian mencapai satuan milimeter. Sistem RTK menggunakan data pengamatan fase data atau koreksi fase dikirim secara seketika dari stasiun referensi ke receiver pengguna. Hasil dari purwarupa adalah resiver GNSS geodetik berbasis radio link yang bisa diprogram agar bisa menghasilkan raw data. Pemrograman menggunakan software RTKLIB seri b33 dengan aplikasi RTKnavi untuk logging data.

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