Papers by Keyword: Global Positioning System (GPS)

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Authors: J.O. Ehiorobo
Abstract: In recent years, the need to monitor for Deformation in Engineering Structures such as Dams, Bridges and Tall buildings have become more necessary as a result of reported failures of many of these structures with catastrophic consequences globally. Global Positioning System (GPS) is highly automated and less labour intensive than other conventional techniques used in structural deformation monitoring. For most applications, such as National Geodetic Control Network, Urban Control Network and other Engineering Control Network, an accuracy in the cm level for most GPS work is quite adequate. For Structural deformation monitoring however, the required accuracy is in millimeters. In this paper, the use of Static Differential GPS method with multiple receivers for high precision measurement was investigated using the monitoring Stations at Ikpoba Dam as case study Scenerio. Four units of LEICA 300 Dual Frequency GPS receivers were deployed for code and carrier phase measurements with observation session of 1hr at a sampling rate of 15 sec. Baseline Processing and Least Squares Adjustment of observation was carried out in WGS 84 and NTM reference frames using the LEICA SKI-PRO Processing software and Move. Analysis of the results revealed that the number of outliers in the observation were <5% and the accuracy of horizontal and vertical coordinates were 4mm maximum for horizontal and 2mm maximum for vertical. The study revealed that in areas with favourable satellite constellation and appropriate reduction or elimination of multipath and other noise like errors, Static Differential GPS techniques with a combination of code and carrier phase measurement gives good results for structural deformation monitoring.
Authors: Xiong He, Yi Yang Gao, Tao Chen
Abstract: This Paper Introduces a Method of Designing and Organizing Road Network Data and Clarifies Algorithm Based on Layering Search, Suitable for Computing the Routes of Vehicle Navigation in Big Districts. the Algorithm Is Calculated in the High Grade Road Network, and then in the Local Refinement. the Method Is to Get a Point in the Calculated High Grade Route and then Calculate the Optimal Route from the Start Point to the Point (the Selected Point Should Be a Node near to the End), so Does the End Point. the Algorithm Was Applied to the Routes Planning and the Experimental Results Show that the Use of Data Structure and Algorithm Saves Storage Space and Greatly Improves the Calculation Efficiency.
Authors: Cheng Fa Gao, Xue Feng Shen
Abstract: In view of the deficiency of algorithm for VRS (Virtual Reference Station) based on the triangular network, a novel algorithm for VRS which is based on star network is proposed. Firstly, a kind of baseline solution method of network RTK/VRS based on star structure is established and an ambiguity resolution method is also proposed in this paper. Then further research is done to analyze the algorithm of ionospheric and tropospheric correction separately. Finally, the network ambiguity resolution and correction calculation in both star structure network and traditional triangular network are verified and analyzed through two tests. These tests indicate that the Network RTK (VRS) based on star structure this paper proposed can obviously accelerate the fixed time of network ambiguity resolution, which can be up to 50%, and can achieve higher precision and reliability in the generation of network correction.
Authors: Weerapol Namboonruang, Nutthanan Suphadon, Prayoon Yong-Amnuai
Abstract: Making geological map Muangmai sub-district, Amphawa district, Samutsongkram Province area of Thailand is the example area. The conclusion of making map, which use the land section data together with the an aerial photography ortho- colour type and coordinate by GPS in field work and store data in digital map format, is totally 1,045 plots. These areas are summary of 3,944,000.00 m2 classified into 118,400.00 m2 for public roads, 108,800.00 m2 for public canals, 3,563,200.00 m2 for dwellings and agricultural lands and 153,600 m2 for public places, temples and schools.
Authors: Zheng Liu, Hua Yan, Zhen Li
Abstract: Traditional image clustering methods mainly depends on visual features only. Due to the well-known “semantic gap”, visual features can hardly describe the semantics of the images independently. In the case of Web images, apart from visual features, there are rich metadata which could enhance the performance of image clustering, such as time information, GPS coordinate and initial annotations. This paper proposes an efficient Flickr photo clustering algorithm by simultaneous integration information of multiple types which are related to Flickr photos using k-partite graph partitioning. For a personal collection of Flickr, we firstly determine the value of k which means the number of data types we used. Secondly, these heterogeneous metadata are mapped to vertices of a k-partite graph, and relationship between the heterogeneous metadata is represented as edge weight. Finally, Flickr photos could be clustered by partitioning the k-partite graph. Experiments conducted on the photos in Flickr demonstrate the effectiveness of the proposed algorithm.
Authors: G. Elumalai, G.B. Bhaskar
Abstract: In Indian Transport System identification of faulty vehicle is a challenging task for the enforcing authority within a specified time. Faulty vehicles include hit and run accident vehicle, traffic violators, theft vehicles, escaping an accused in a vehicle and non-payment of tax vehicle etc. In the existing Intelligent Transport System (ITS), only the vehicles are being monitored, instead of catching the faulty vehicle. In this methodology, the vehicles are controlled by controlling the fuel mixture through Global Positioning System (GPS) and Electronic Control Unit (ECU) within stipulated time duration from the control room itself. To conclude, the prime objective of this work involves conducting an experiment to monitor as well as controlling the vehicle through GPS from the control room itself.
Authors: Yu Feng Zhu, Xiao Li Ding, Zhi Wei Li, Shi Jian Zhou
Abstract: With the improvement of GPS measurement methods and its increasing precision, the GPS technology obtains more and more widespread application in our country marine survey. This paper mainly discussed the GPS technology using in the sea navigational affairs project application, combined with Nantong YangKou port Artificial Island project, introduced about some methods of using GPS in the hull dolosse installment localization and the seabed, the island wall monitoring in detail. And also some beneficial experience of GPS technology applying in hull installment localization and the marine monitor were summarized.
Authors: Zheng Xiang, Wei Jun Pan, Jun Luo
Abstract: The application of Automatic Dependent Surveillance-Broadcast (ADS-B) in the training for air traffic controller is investigated in the presented work. ADS-B is a surveillance technology for tracking aircraft as part of the Next Generation Air Transportation System (NextGen). Compared to radar, ADS-B system has many advantages such as lower deployment cost, higher accuracy and more frequently update. As surveillance method transits from radar surveillance to ADS-B surveillance, the training for air traffic controller should incorporate ADS-B system correspondingly. In the presented work, the features of ADS-B are introduced as well as the structure of ADS-B system is illustrated, and a novel framework for training air traffic controller with ADS-B system is proposed. It is seen that air traffic controller can be trained with lower cost, shorter period and more flexibility compared to that with radar surveillance.
Authors: Yi Lin Guo, Xin Yan
Abstract: The displacement is an important indicator of safety evaluation for highway slope. The highest measurement accuracy of global positioning system (GPS) achieves millimeter, and the sampling frequency can reach 20Hz. The displacement can be solved real-time, and the GPS measuring receiver adapts to the complex and harsh working environment. The paper summarizes the current technology level of GPS application in highway slope monitoring and introduces a low-cost monitoring technology that one receiver assemble multi-antenna to measure several points’ displacement. Based on the application of GPS technology using in highway slope safety monitoring system, this paper set the FuYin Highway as the engineering project and demonstrate how to apple the GPS technology in displacement monitoring and security evaluation.
Authors: Yi Lin Guo, Yan Xin
Abstract: With the application of Global Positioning System (GPS) echnology using in the field of modern transport, more and more long-span bridges have set up the GPS system to monitor the real-time deformation in safety monitoring system. Nowadays the highest measuring accuracy of GPS technology achieves millimeter, and the sampling frequency can reach 20Hz. It can solve real-time deformation data and adapt to the complexity and poor working environment. Based on the application of GPS technology using in long-span bridges safety monitoring system, this paper set the Huangpu bridge as the engineering project and demonstrate how to apple the GPS technology in deformation monitoring and security evaluation.
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