scholarly journals A New Strategy for Improving the Accuracy of Aircraft Positioning Using DGPS Technique in Aerial Navigation

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4431
Author(s):  
Kamil Krasuski ◽  
Dariusz Popielarczyk ◽  
Adam Ciećko ◽  
Janusz Ćwiklak
Keyword(s):  
Research Methodology ◽  
Weighting Scheme ◽  
Test Method ◽  
Differential Gps ◽  
Positioning Accuracy ◽  
Vector Length ◽  
Flight Experiment ◽  
Mathematical Algorithm ◽  
Position Errors ◽  
New Research

In this paper a new mathematical algorithm is proposed to improve the accuracy of DGPS (Differential GPS) positioning using several GNSS (Global Navigation Satellites System) reference stations. The new mathematical algorithm is based on a weighting scheme for the following three criteria: weighting in function of baseline (vector) length, weighting in function of vector length error and weighting in function of the number of tracked GPS (Global Positioning System) satellites for a single baseline. The algorithm of the test method takes into account the linear combination of the weighting coefficients and relates the position errors determined for single baselines. The calculation uses a weighting scheme for three independent baselines denoted as (1A,2A,3A). The proposed research method makes it possible to determine the resultant position errors for ellipsoidal BLh coordinates of the aircraft and significantly improves the accuracy of DGPS positioning. The analysis and evaluation of the new research methodology was checked for data from two flight experiments carried out in Mielec and Dęblin. Based on the calculations performed, it was found that in the flight experiment in Mielec, due to the application of the new research methodology, DGPS positioning accuracy improved from 55 to 94% for all the BLh components. In turn, in the flight experiment in Dęblin, the accuracy of DGPS positioning improved by 63–91%. The study shows that the highest DGPS positioning accuracy is seen when using weighting criterion II, the inverse of the square of the vector length error.

The Slovene literature in Austria (the national and the polycultural)

2020 ◽  
pp. 446-460
Author(s):  
Nadezhda N. Starikova ◽  
Keyword(s):  
Research Methodology ◽  
Native Language ◽  
Contemporary Literature ◽  
The State ◽  
National Minority ◽  
Official Language ◽  
Linguistic Terms ◽  
Protective Function ◽  
Slovenian Population ◽  
New Research

In 1920, the native Slovenian lands of southern Carinthia were included into the Austrian Republic, and the Slovenian population fell under the jurisdiction of the state, the official language of which was German. Under these conditions, literature in the native language became an important factor in the resistance against assimilation for the Carinthian Slovenes. However, decades later, the national protective function of the artistic word gradually came to naught. The contemporary literature of the Slovenian minority in Austria is a special phenomenon combining national and polycultural components and having two cultural and historical contexts, two identities - Slovenian and Austro-German. In aesthetic, thematic, linguistic terms, this literature is so diverse that it no longer fits into a literature of a national minority, and can no longer be automatically assigned to only one of the two literatures - Slovenian or Austrian. A variety of works, including proper Slovenian texts, hybrid bilingual forms, and compositions in German, of course, requires a new research methodology that would expand existing approaches and could cover the literary practice of those who create a panorama of Carinthian reality, which is in demand both in Slovenia and in Austria.

scholarly journals Teoretyczne aspekty tworzenia elementów dokumentacyjnych ze szczególnym uwzględnieniem abstraktów a ich rzeczywisty kształt. Propozycja badań w obszarze artykułów z czasopism z zakresu bibliologii

2019 ◽  
Vol 62 ◽  
pp. 179-220
Author(s):  
Katarzyna Jamrozik ◽  
Jakub Maciej Łubocki
Keyword(s):  
Research Methodology ◽  
Scholarly Communication ◽  
Language Usage ◽  
Distinctive Features ◽  
Cognitive Value ◽  
Text Readability ◽  
Depth Analysis ◽  
New Research ◽  
Scholarly Discourse ◽  
Initial Results

THEORETICAL ASPECTS OF DOCUMENTARY ELEMENTS WITH SPECIAL CONSIDERATION OF ABSTRACTS. A RESEARCH PROPOSAL CONCERNING ARTICLES FROM BIBLIOLOGY JOURNALSReferring to the changes taking place in modern scholarly communication and the specificity of scholarly discourse, the authors present the latest conclusions from research concerning improvement of comprehensibility of documentary analyses, summaries and abstracts. This is influenced by text readability, and the structure and cognitive value of documentary elements. The authors present a typology of such elements as well as their distinctive features. On this basis they propose a new research methodology. Thanks to this methodology it will be possible to verify: 1. whether elements attached to articles from bibliology journals are, according to recommendations, more readable easier to comprehend than the content of the articles themselves;2. the current tendency in their length, which should be increased, according to recommendations;3. whether, in accordance with recommendations, all keywords have been used in the elements, which will facilitate article indexation in databases; 4. whether the existing terminological recommendations correspond to the actual language usage. The initial results obtained by the authors show that research in this area should be continued, as the proposed hypotheses require in-depth analysis and verification.

scholarly journals Performance of Open Source Precise Point Positioning Software Using Single-Frequency GPS Data

2006 ◽  
Vol 41 (2) ◽  
pp. 79-86 ◽  
Author(s):  
Chalermchon Satirapod ◽  
Somchai Kriengkraiwasin
Keyword(s):  
Open Source ◽  
Precise Point Positioning ◽  
Main Tool ◽  
Single Frequency ◽  
Gps Data ◽  
Differential Gps ◽  
Satellite Clock ◽  
Positioning Accuracy ◽  
Point Positioning ◽  
Station Location

Performance of Open Source Precise Point Positioning Software Using Single-Frequency GPS Data This research aims to assess the performance of GPS Precise Point Positioning (PPP) with code and carrier phase observations from L1 signal collected from geodetic GPS receiver around the world. A simple PPP software developed for processing the single frequency GPS data is used as a main tool to assess a positioning accuracy. The precise orbit and precise satellite clock corrections were introduced into the software to reduce the orbit and satellite clock errors, while ionosphere-free code and phase observations were constructed to mitigate the ionospheric delay. The remaining errors (i.e. receiver clock error, ambiguity term) are estimated using Extended Kalman Filter technique. The data retrieved from 5 IGS stations located in different countries were used in this study. In addition, three different periods of data were downloaded for each station. The obtained data were then cut into 5-min, 10-min, 15-min and 30-min data segments, and each data segment was individually processed with the developed PPP software to produce final coordinates. Results indicate that the use of 5-min data span can provide a horizontal positioning accuracy at the same level as a pseudorange-based differential GPS technique. Furthermore, results confirm effects of station location and seasonal variation on obtainable accuracies.

scholarly journals Variation of Static-PPP Positioning Accuracy Using GPS-Single Frequency Observations (Aswan, Egypt)

2017 ◽  
Vol 52 (2) ◽  
pp. 19-26 ◽  
Author(s):  
Ashraf Farah
Keyword(s):  
Precision Agriculture ◽  
Precise Point Positioning ◽  
Low Cost ◽  
High Accuracy ◽  
Single Frequency ◽  
Dual Frequency ◽  
Differential Gps ◽  
Positioning Accuracy ◽  
Comparable Accuracy ◽  
Positioning Technique

Abstract Precise Point Positioning (PPP) is a technique used for position computation with a high accuracy using only one GNSS receiver. It depends on highly accurate satellite position and clock data rather than broadcast ephemeries. PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of collected observations. PPP-(dual frequency receivers) offers comparable accuracy to differential GPS. PPP-single frequency receivers has many applications such as infrastructure, hydrography and precision agriculture. PPP using low cost GPS single-frequency receivers is an area of great interest for millions of users in developing countries such as Egypt. This research presents a study for the variability of single frequency static GPS-PPP precision based on different observation durations.

Directly Georeferenced Ground Feature Points with UAV Borne Photogrammetric Platform without Ground Control

2013 ◽  
Vol 284-287 ◽  
pp. 1523-1527
Author(s):  
Meng Lun Tsai ◽  
Kai Wei Chiang ◽  
Cheng Fang Lo ◽  
Jiann Yeou Rau
Keyword(s):  
Real Time ◽  
Spatial Information ◽  
Disaster Relief ◽  
Low Cost ◽  
Control Point ◽  
Integrated System ◽  
Single Frequency ◽  
Ground Control ◽  
Differential Gps ◽  
Positioning Accuracy

In order to facilitate applications such as environment detection or disaster monitoring, developing a quickly and low cost system to collect near real time spatial information is very important. Such a rapid spatial information collection capability has become an emerging trend in the technology of remote sensing and mapping application. In this study, a fixed-wing UAV based spatial information acquisition platform is developed and evaluated. The proposed UAV based platform has a direct georeferencing module including an low cost INS/GPS integrated system, low cost digital camera as well as other general UAV modules including immediately video monitoring communication system. This direct georeferencing module is able to provide differential GPS processing with single frequency carrier phase measurements to obtain sufficient positioning accuracy. All those necessary calibration procedures including interior orientation parameters, the lever arm and boresight angle are implemented. In addition, a flight test is performed to verify the positioning accuracy in direct georeferencing mode without using any ground control point that is required for most of current UAV based photogrammetric platforms. In other word, this is one of the pilot studies concerning direct georeferenced based UAV photogrammetric platform. The preliminary results in term of positioning accuracy in direct georeferenced mode without using any GCP illustrate horizontal positioning accuracies in x and y axes are both less than 20 meters, respectively. On the contrary, the positioning accuracy of z axis is less than 50 meters with 600 meters flight height above ground. Such accuracy is good for near real time disaster relief. Therefore, it is a relatively safe and cheap platform to collect critical spatial information for urgent response such as disaster relief and assessment applications where ground control points are not available.

Analysis on the Establishment of Sustainable Developmental Competition-Index-System in Industrial Manufacturing System in Hebei

2012 ◽  
Vol 252 ◽  
pp. 364-367
Author(s):  
Yan Na Zhao
Keyword(s):  
Research Methodology ◽  
Index System ◽  
Manufacturing System ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Competition Index ◽  
Industrial Manufacturing ◽  
New Research

This article puts forward the new research methodology during establishing evaluation index system of industrial manufacturing system competence in He Bei .Firstly, we establish a set of the primary evaluating Index system. Secondly,we assess and screen these Indexes. At lastly ,we determine the final evaluating Index system.The Index system is more objective in this way.

scholarly journals Measuring the Safety Effect of Raised Bicycle Crossings Using a New Research Methodology

1998 ◽  
Vol 1636 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Per Gårder ◽  
Lars Leden ◽  
Urho Pulkkinen
Keyword(s):  
Bayesian Approach ◽  
Research Methodology ◽  
Accident Analysis ◽  
Traffic Calming ◽  
Expert Model ◽  
Before And After ◽  
Study Methodology ◽  
Safety Effect ◽  
New Research ◽  
Before And After Study

Before-and-after study methodology was developed and applied to evaluating the effect on bicyclists’ safety of raising urban bicycle crossings by 4 to 12 cm. In total, 44 junctions were reconstructed in this way in Gothenburg, Sweden. Four of these were studied in detail. Before the implementations, bicyclists were riding either in the roadway or on separate paths parallel to the roadway. The paths then ended with short ramps or curb cuts at each cross street, and bicyclists used nonelevated, marked bicycle crossings, similar to pedestrian crosswalks but delineated by white painted rectangles rather than zebra stripes. The results show that the paths with raised crossings attracted more than 50 percent more bicyclists and that the safety per bicyclist was improved by approximately 20 percent due to the increase in bicycle flow, and with an additional 10 to 50 percent due to the improved layout. However, the increased bicyclist volume means that the total number of bicycle accidents is expected to increase. Besides accident analysis, the change in risk was estimated using four different methods: surveys of bicyclists and experts, respectively; conflict data; and a quantitative expert model. Using a Bayesian approach for combining the results shows that the most likely effect of raising the bicycle crossing is a risk reduction of around 30 percent, compared with the before situation with a conventional bicycle crossing. Motorists and pedestrians also saw safety benefits from this traffic-calming measure.

scholarly journals Optimal Distance between Mobile Buoy and Target for Moving Long Baseline Positioning System

2015 ◽  
Vol 68 (4) ◽  
pp. 809-826 ◽  
Author(s):  
Weisheng Yan ◽  
Wei Chen ◽  
Rongxin Cui ◽  
Huiping Li
Keyword(s):  
Distance Measurement ◽  
Position Measurement ◽  
Error Sources ◽  
Positioning Accuracy ◽  
Optimal Geometry ◽  
Position Errors ◽  
Long Baseline ◽  
Optimal Distance ◽  
Geometry Simulation ◽  
Moving Long Baseline

This paper investigates the problem of how to design the distance between a mobile buoy and the target to derive maximum positioning accuracy with a Moving Long Baseline (MLBL). To that end, the positioning model and the error sources of MLBL are derived, respectively. It is assumed that the position measurement of the mobile buoy and the distance measurement between the mobile buoy and the target are corrupted by white Gaussian noises, and the variance of the distance measurement is distance-dependent. Using tools from estimation theory, the Positioning Accuracy Metric (PAM) is designed with the distance error and the position errors are considered. Based on the PAM, the optimal distance between the mobile buoy and target is deduced when the mobile buoys are in optimal geometry. Simulation examples illustrate the results.

Process Mining: A New Research Methodology for AIS

2011 ◽  
Author(s):  
Michael Gamini Alles ◽  
Mieke Julie Jans ◽  
Miklos A. Vasarhelyi
Keyword(s):  
Research Methodology ◽  
Process Mining ◽  
New Research
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