Delineation of Agricultural Drainage Pipe Patterns Using Ground Penetrating Radar Integrated with a Real-Time Kinematic Global Navigation Satellite System

Better methods are needed for mapping agricultural drainage pipe systems. Prior research on small test plots indicates that ground penetrating radar (GPR) is oftentimes capable of detecting buried drainage pipes; however, the feasibility of employing this geophysical technique in larger field areas has not been adequately evaluated. Ground penetrating radar integrated with a Real-Time Kinematic (RTK) Global Navigation Satellite System (GNSS) may be an effective and efficient means of mapping drain lines within agricultural fields. Therefore, GPR-RTK/GNSS was tested in three agricultural settings; with Site 1 and Site 2 located in Beltsville, MD, USA and Site 3 near Columbus, OH, USA. Soils at the three sites ranged from silty clay loam to loamy sand. A GPR unit with 250 MHz antennas was used to detect drainage pipes, and at Sites 1 and 2, a physical GNSS base station was utilized, while a virtual base station was employed at Site 3. The GPR-RTK/GNSS configurations used in this study delineated a complex rectangular drainage pipe system at Site 1, with one set of drainage pipes oriented southwest-northeast and a second oriented southeast-northwest. At Site 2, a herringbone drain line pattern was outlined, and at Site 3, random drain lines were found. When integrated with RTK/GNSS, spiral or serpentine GPR transects (or spiral/serpentine segments of a GPR transects) were utilized to provide insight on drain line directional trends. Consequently, given suitable field conditions, GPR integrated with RTK/GNSS can be a valuable tool for farmers and drainage contractors needing to map subsurface drainage systems.

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

Acta Tecnológica ◽

10.35818/acta.v14i2.949 ◽

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

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 Global Navigation Satellite System (GNSS) pelo método Real Time Kinematic (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.<div> </div>

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LEO enhanced Global Navigation Satellite System (LeGNSS) for real-time precise positioning services

Advances in Space Research ◽

10.1016/j.asr.2018.08.017 ◽

2019 ◽

Vol 63 (1) ◽

pp. 73-93 ◽

Cited By ~ 14

Author(s):

Bofeng Li ◽

Haibo Ge ◽

Maorong Ge ◽

Liangwei Nie ◽

Yunzhong Shen ◽

...

Keyword(s):

Real Time ◽

Global Navigation Satellite System ◽

Satellite System ◽

Navigation Satellite ◽

Precise Positioning ◽

Global Navigation ◽

Global Navigation Satellite

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

Applied Sciences ◽

10.3390/app10061952 ◽

2020 ◽

Vol 10 (6) ◽

pp. 1952 ◽

Cited By ~ 1

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).

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Use of Global Navigation Satellite System (GNSS) Software Defined Receiver (SDR) for Determining the 3D Real Time Position Variation in Dense Urban Areas by Averaging Method

2019 Sixth International Conference on Aerospace Science and Engineering (ICASE) ◽

10.1109/icase48783.2019.9059244 ◽

2019 ◽

Author(s):

Rizwan Ashfaq ◽

Muhammad Saleem

Keyword(s):

Real Time ◽

Global Navigation Satellite System ◽

Urban Areas ◽

Averaging Method ◽

Satellite System ◽

Navigation Satellite ◽

Time Position ◽

Global Navigation ◽

Global Navigation Satellite

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Low-cost, high accuracy Global Navigation Satellite System positioning for understanding floods

10.5194/egusphere-egu2020-8446 ◽

2020 ◽

Author(s):

Hessel Winsemius ◽

Andreas Krietemeyer ◽

Kirsten Van Dongen ◽

Ivan Gayton ◽

Frank Annor ◽

...

Keyword(s):

Global Navigation Satellite System ◽

Low Cost ◽

Smart Phone ◽

Satellite System ◽

Base Station ◽

Navigation Satellite ◽

Low Resource Settings ◽

Low Resource ◽

Global Navigation ◽

Global Navigation Satellite

Detailed elevation is a prerequisite for many hydrological applications. To name a few, understanding of urban and rural flood hazard and risk; understanding floodplain geometries and conveyance; and monitoring morphological changes. The accuracy of traditional Global Navigation Satellite System (GNSS) chipsets in smart phones is typically in the order of several meters, too low to be useful for such applications. Structure from Motion photogrammetry methods or Light Detection and Ranging (LIDAR), may be used to establish 3D point clouds from drone photos or lidar instrumentation, but even these require very accurate Ground Control Point (GCP) observations for a satisfactory result. These can be acquired through specialised GNSS rover equipment, combined with a multi-frequency GNSS base station or base station network, providing a Real-Time (RTK) or Post-Processing Kinematics (PPK) solution. These techniques are too expensive and too difficult to maintain for use within low resource settings and are usually deployed by experts or specialised firms.Here we investigate if accurate positioning (horizontal and vertical) can be acquired using a very recently released low-cost multi-constellation dual-frequency receiver (ublox ZED-F9P), connected with a simple antenna and a smart phone. The setup is remarkably small and easy to carry into the field. Using a geodetic (high-grade) GNSS antenna and receiver as base station, initial results over baselines in the order of a few km with the low-cost receiver revealed a positioning performance in the centimeter domain. Currently, we are testing the solution using a smart phone setup as base station within Dar es Salaam, to improve elevation mapping within the community mapping project &#8220;Ramani Huria&#8221;. We will also test the equipment for use in GCP observations within the ZAMSECUR project in Zambia and TWIGA project in Ghana. This new technology opens doors to affordable and robust observations of positions and elevation in low resource settings.

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

Journal of Southern Hemisphere Earth System Science ◽

10.1071/es19009_co ◽

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.

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

Sensors ◽

10.3390/s18124130 ◽

2018 ◽

Vol 18 (12) ◽

pp. 4130 ◽

Cited By ~ 4

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.

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