scholarly journals The Southeastern Sicily GPS network

1995 ◽  
Vol 38 (2) ◽  
Author(s):  
V. Achilli ◽  
M. Anzidei ◽  
P. Baldi ◽  
F. Broccio ◽  
R. Velardita
Keyword(s):  
Global Positioning System ◽  
Seismic Event ◽  
Stress Fields ◽  
Great Loss ◽  
Ground Movements ◽  
The Past ◽  
Gps Network ◽  
Global Positioning ◽  
Set Up ◽  
Heavy Damage

The area located between Catania and Syracuse (Southeastern Sicily), characterised by the presence of the Simeto-Scordia-Lentini graben, was affected in the past by a strong seismicity as proved by the occurrence of seismic events strong enough to reach the XI degree of the MCS scale. In particular the January 11 th, 1693 (l = XI MCS) earthquake with a magnitude over 7.5 (estimated), caused huge damage and a great loss of human lives. Following the last seismic event which occurred on December 13th, 1990 (Ml = 5.4) which caused heavy damage and many victims in the Catania-Syracuse area, a geodetic Global Positioning System network (GPS) was set up with the aim of monitoring ground movements in one of the Italian areas subjected to high seismic risk, This "pace geodesy technique supplies high precision measurements and represent, a powerful new tool for investigating both regional stress fields and the evolution of local tectonic areas. The GPS network will allow the detection of ground movements with a centimetric accuracy through repeated surveys in time. The results obtained in two surveys carried out il1 1991 al1d 1993, are described in this paper.

scholarly journals Investigation of accurate method in 3-D position using Cors-Net in Istanbul

2012 ◽  
Vol 18 (2) ◽  
pp. 171-184 ◽  
Author(s):  
Kutalmis Gumus ◽  
Cahit Tagi Celik ◽  
Halil Erkaya
Keyword(s):  
Real Time ◽  
Conventional Method ◽  
Global Positioning System ◽  
Complex Structure ◽  
Accurate Method ◽  
Reference Station ◽  
Positioning System ◽  
Virtual Reference ◽  
Global Positioning ◽  
Set Up

In this study, for Istanbul, there are two Cors Networks (Cors-TR, Iski Cors) providing Virtual Reference Station (VRS), and Flachen Korrektur Parameter (FKP), corrections to rover receiver for determining 3-D positions in real time by Global Positioning System (GPS). To determine which method (or technique) provides accurate method for position fixing, a test network consisting of 49 stations was set up in Yildiz Technical University Davudpasa Campus. The coordinates of the stations in the test network were determined by conventional geodetic, classical RTK, VRS and FKP methods serviced by both Cors-TR and Iski Cors. The results were compared to the coordinates by the conventional method by using total station. The results showed a complex structure as the accuracy differs from one component to another such as in horizontal coordinates, Y components by CorsTR_VRS and Cors_TR_ FKP showed 'best' results while the same technique provided X components consistent accuracy with the Y component but less accurate than by real time kinematic (RTK). In vertical components, of all the techniques used for the h components, CorsTR_VRS showed 'best' accuracy with three outliers.

scholarly journals The onset area of Ice Stream D, West Antarctica

2000 ◽  
Vol 46 (152) ◽  
pp. 95-101 ◽  
Author(s):  
Robert Bindschadler ◽  
Xin Chen ◽  
Patricia Vornberger
Keyword(s):  
Strain Rate ◽  
Global Positioning System ◽  
Landsat Imagery ◽  
Surface Flow ◽  
West Antarctica ◽  
The Past ◽  
Ice Stream ◽  
Global Positioning ◽  
Longitudinal Strain Rate ◽  
Streaming Flow

AbstractSurface flow in a 10 000 km2 expanse of the onset area of Ice Stream D, West Antarctica, was measured by repeat, precise global positioning system surveys over a 1 year interval. The pattern of velocity and strain rate shows the development of Ice Stream D, the major flow into which originates south of Byrd station and follows the course of a deep bed channel. Plotting of the driving stress vs the ratio of velocity and ice thickness identifies the onset of streaming flow (roughly 140 km downstream of Byrd station) as a transition between deformation flow and sliding flow. Along the kinematic center line of the developing ice stream, the ice rheology is linear at stresses below 0.6 bar, and appears temperate at the base well before the onset of streaming is reached. The onset corresponds to a maximum driving stress of 0.8 bar. It occurs downstream of a slight increase in longitudinal strain rate where stronger along-flow lineations are apparent in Landsat imagery, and after the ice has passed the center of an overdeepening in the bed channel. No current deviation from equilibrium is detected in this region, but a set of flow stripes misaligned with present flow indicates significant changes in flow have occurred in the past.

Digital Mining Control Management System in an Open Pit Based on GIS/GPS/GPRS

2011 ◽  
Vol 467-469 ◽  
pp. 207-211
Author(s):  
Shi Gun Jing ◽  
Fa Ben Li ◽  
Xin Ma
Keyword(s):  
Global Positioning System ◽  
Management System ◽  
Programming Model ◽  
Open Pit ◽  
General Packet Radio Service ◽  
Global Positioning ◽  
Set Up ◽  
And Control ◽  
Control Management System ◽  
Control Management

Using GIS(Geographic Information System), GPS(Global Positioning System), and GPRS(General Packet Radio Service), an digital mining control management system in an open pit has been designed and developed. A linear programming model is set up in a practical application. By the model, the system can automatically draw up production plan of ore blending well every day. The system can monitor and dispatch open-pit trucks and shovels well, and can play back their historical paths. It can monitor and control the process of mining production in real time. The system can also count the number of trucks’ delivery and shovels’ loading automatically. Experiments on real scenes show that the performance of this system is stable and can satisfy production standards of ore blending in open pits.

scholarly journals Editorial for the Special Issue: “High-Precision GNSS: Methods, Open Problems and Geoscience Applications”

2020 ◽  
Vol 12 (10) ◽  
pp. 1602
Author(s):  
Xingxing Li ◽  
Jacek Paziewski ◽  
Mattia Crespi
Keyword(s):  
High Precision ◽  
Global Positioning System ◽  
Positioning System ◽  
Special Issue ◽  
Open Problems ◽  
The Past ◽  
Global Positioning

In the past two decades, the high-precision Global Positioning System (GPS) has significantly increased the range of geoscience applications and their precision [...]

scholarly journals Surge of Bering Glacier and Bagley Ice Field, Alaska: an update to August 1995 and an interpretation of brittle-deformation patterns

1997 ◽  
Vol 43 (145) ◽  
pp. 427-434 ◽  
Author(s):  
Ute Christina Herzfeld ◽  
Helmut Mayer
Keyword(s):  
Global Positioning System ◽  
Brittle Deformation ◽  
Location Data ◽  
The Past ◽  
Ice Surface ◽  
Bering Glacier ◽  
Global Positioning ◽  
Ice Field ◽  
Deformation Patterns

AbstractIn the summers of 1993, 1994 and 1995, video and Global Positioning System location data and 35 mm photographs were collected in a series of systematic survey flights undertaken over the Bering Glacier and Bagley Ice Field system (Alaska) in an effort to characterize surge-crevasse patterns and surge propagation. During survey flights in late August 1995, we observed that the 1993–94. Bering Glacier surge was continuing and still expanding affecting new areas farther up in Bagley Ice Field. New crevasse fields, similar in pattern to the first surge crevasses we had observed in June 1993 below Khitrov Hills and in other isolated areas of central Bering Glacier and in July 1994 near the head of Bering Glacier (near the junction of Bering Glacier and Bagley Ice Field, in both upper Bering Glacier and Bagley Ice Field), were opening in eastern Bagley Ice Field and in the “Stellet” side of Bagley Ice Field. The type of crevasses seen in the new fields suggested that the surge was propagating into these areas. By analysis and interpretation of the brittle-deformation patterns apparent in the crevasse patterns, some aspects of the past kinematic framework of the surge can be deduced. This approach may lead to a more general classification of ice-surface structures and to their linkage to ongoing processes.

Simulation analysis of productivity variation by global positioning system (GPS) implementation in earthmoving operations

2006 ◽  
Vol 33 (9) ◽  
pp. 1105-1114 ◽  
Author(s):  
Seungwoo Han ◽  
Sangyoub Lee ◽  
Taehoon Hong ◽  
Hoon Chang
Keyword(s):  
Global Positioning System ◽  
Simulation Analysis ◽  
Cost Savings ◽  
Positioning System ◽  
Construction Simulation ◽  
Productivity Improvement ◽  
Global Positioning ◽  
Practical Tool ◽  
Increase Productivity ◽  
Set Up

The global positioning system (GPS) is being applied in the construction industry as a practical tool for higher productivity. The aim of this study is to estimate the productivity improvement from GPS implementation in earthmoving operations using construction simulation. The results show that the GPS-based system can increase productivity by 21.74% and cost savings by 12.92% over the conventional system in a project with a short haul distance and can increase productivity by 5.67% and cost savings by 4.79% in a project with a long haul distance. It was noted that the bulldozer and truck are critical resources for productivity in each project and that the greater the number of work activities in a project, the lower the improvement in productivity as a result of using a specific technology applied to a limited number of pieces of equipment, due to the existence of many varied factors. This study is intended to help construction planners set up optimized GPS-based earthmoving operations.Key words: earthmoving, global positioning system, simulation, productivity.

scholarly journals Connected Objects Geo-Localization Based on SS-RSRP of 5G Networks

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2750
Author(s):  
Ahmed Bannour ◽  
Ahmed Harbaoui ◽  
Fawaz Alsolami
Keyword(s):  
Global Positioning System ◽  
Data Transfer ◽  
Quality Measurement ◽  
Mobile Network ◽  
5G Networks ◽  
5G Network ◽  
Global Positioning ◽  
Generation Network ◽  
Dense Urban Area ◽  
Set Up

The Global Positioning System (GPS) is not the only way to solve connected objects’ geo-localization problems; it is also possible to use the mobile network infrastructure to geo-locate objects connected to the network, using antennas and signals designed for voice and data transfer, such as the 5th generation network. 5G is considered as a least expensive solution because there is no specific equipment to set up. As long as the object is in an area covered by the network, it connects to the nearest 5G Micro-Cell (MC). Through exchange of signals with the MC node we can locate the object. Currently, this location is very fast with less than 5 s but not very precise because it depends on the number of MC antennas of the operator in question and their distance. This paper presents a novel technique to geo-locate connected object in a covered 5G area. We exploit the 5G SS-RSRP used for signal quality measurement, to estimate the distance between two Connected Objects (COs) in move and in a dense urban area. The overall goal is to present a new concept laying on the 5G SS-RSRP signalling. The proposed solution takes into consideration the Deterministic and the Stochastic effect of the received signals which is not treated by the previous works. The accuracy is optimum even after approaching to the distance of one meter which is not reached in previous works too. Our method can also be deployed in the upcoming 5G network since it relies on 5G signals itself. This work and that of Wang are both based on RSRP and give comparable theoretical complexities therefore comparable theoretical execution times as well. However, to obtain a reliable learning Wang requires a huge amount of data which makes it difficult to get a real time aspect of this algorithm. The use of RSRP and the elimination of the learning phase will give more chance to our work to achieve desired performances. Numerical results show the appropriateness of the proposed algorithms and good location accuracy of around one meter. The Cramer Rao Lower Bound derivations shows the robustness of the proposed estimator and consolidate the work.

Low Cost and Centimeter-Level Global Positioning System Accuracy Using Real-Time Kinematic Library and Real-Time Kinematic GPSA

2019 ◽  
Vol 12 ◽  
Author(s):  
Hemant Kumar Gianey ◽  
Mumtaz Ali ◽  
V. Vijayakumar ◽  
Ashutosh Sharma ◽  
Rajiv Kumar
Keyword(s):  
Real Time ◽  
Global Positioning System ◽  
Low Cost ◽  
Base Station ◽  
Real Time Kinematic ◽  
Global Positioning ◽  
Rtk Gps ◽  
Set Up ◽  
Gps Accuracy ◽  
Gps System

Accuracy and total design and implementation cost of the GPS framework determine the viability of GPS based projects. As the greater part of the advanced framework including telemetry, IoT, Cloud, and AUTOSAR frameworks use GPS to get exact outcomes, finding a software-controlled error correction becomes important. With the execution of open source library such as RTKLIB will help in controlling and revising GPS blunders. The project utilizes the RTKLIB along with two stations for better accuracy. The RTK-GPS framework works under Linux environment, which is embedded in the Beagleboard. The communication between the GPS system is set up utilizing both serial communication protocol and TCP/IP suite. To get high precision inside the network, two GPS modules are utilized. One of them will be mounted on the rover and another GPS is the base station of the setup. Both the GPS will have a double radio wire setup to increase the reception level to reduce the noise and get centimeter-level precision. For long-range communication, Rover utilizes Wi-Fi with TCP/IP stack protocol. In this research paper, setup is intended to accomplish the centimeter level precision through libraries in a Linux environment. The design will be set up and tried on a college campus under various conditions with different error parameters to acquire a low cost and centimeter level GPS accuracy.

scholarly journals Estimating satellite and receiver differential code bias using a relative Global Positioning System network

2019 ◽  
Vol 37 (6) ◽  
pp. 1039-1047 ◽  
Author(s):  
Alaa A. Elghazouly ◽  
Mohamed I. Doma ◽  
Ahmed A. Sedeek
Keyword(s):  
Least Squares ◽  
Global Positioning System ◽  
Gps Data ◽  
Electron Content ◽  
Positioning System ◽  
Total Electron ◽  
Gps Network ◽  
Global Positioning ◽  
The Mean ◽  
Mean Differences

Abstract. Precise total electron content (TEC) is required to produce accurate spatial and temporal resolution of global ionosphere maps (GIMs). Receivers and satellite differential code biases (DCBs) are one of the main error sources in estimating precise TEC from Global Positioning System (GPS) data. Recently, researchers have been interested in developing models and algorithms to compute DCBs of receivers and satellites close to those computed from the Ionosphere Associated Analysis Centers (IAACs). Here we introduce a MATLAB code called Multi Station DCB Estimation (MSDCBE) to calculate satellite and receiver DCBs from GPS data. MSDCBE based on a spherical harmonic function and a geometry-free combination of GPS carrier-phase, pseudo-range code observations, and weighted least squares was applied to solve observation equations and to improve estimation of DCB values. There are many factors affecting the estimated values of DCBs. The first one is the observation weighting function which depends on the satellite elevation angle. The second factor is concerned with estimating DCBs using a single GPS station using the Zero Difference DCB Estimation (ZDDCBE) code or using the GPS network used by the MSDCBE code. The third factor is the number of GPS receivers in the network. Results from MSDCBE were evaluated and compared with data from IAACs and other codes like M_DCB and ZDDCBE. The results of weighted (MSDCBE) least squares show an improvement for estimated DCBs, where mean differences from the Center for Orbit Determination in Europe (CODE) (University of Bern, Switzerland) are less than 0.746 ns. DCBs estimated from the GPS network show better agreement with IAAC than DCBs estimated from precise point positioning (PPP), where the mean differences are less than 0.1477 and 1.1866 ns, respectively. The mean differences of computed DCBs improved by increasing the number of GPS stations in the network.

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