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Tytuł:
Wybrane charakterystyki eksploatacyjne wojskowych odbiorników GPS z modułem SAASM
Selected performance characteristics of GPS SAASM receivers
Autorzy:
Specht, M.
Powiązania:
https://bibliotekanauki.pl/articles/222602.pdf
Data publikacji:
2013
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
moduł SAASM
jamming
spoofing
SAASM module
Opis:
Powszechność wykorzystania cywilnych odbiorników GPS w nawigacji światowej spowodowała konieczność zmiany sposobu podejścia departamentu obrony USA do wykorzystania militarnych odbiorników tego systemu. Na początku xxi wieku opracowano nową koncepcję techniczno-organizacyjną użytkowania odbiorników militarnych z modułem SAASM (Selective Availability Anti-Spoofing Module), których wykorzystanie nie wymaga synchronizacji wstępnej z sygnałami cywilnymi. Bezpośredni dostęp do serwisu wojskowego SPS (Standard Positioning Service) stał się istotą rewolucji w zakresie wykorzystania GPS w aplikacjach militarnych. W artykule zaprezentowano wybrane charakterystyki techniczne odbiorników GPS z modułem SAASM.
Widespread use of GPS receivers in worldwide navigation has made the us department of defense change their approach to the use of military receivers of the system. At the beginning of the 21st century a new technical-organizational concept was developed of using military SAASM (Selective Availability Anti-Spoofing Module) receivers which whose employment does not require initial synchronization with civilian signals. Direct access to the Standard Positioning Service (SPS) omitting civilian signals has become the core of revolution in using GPS for military purposes. The paper presents selected technical characteristics of GPS receivers with SAASM module.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2013, R. 54 nr 4 (195), 4 (195); 87-98
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wojskowe odbiorniki GPS z modułem SAASM — wprowadzenie do zagadnienia
The military GPS receivers with SAASM — problem introduction
Autorzy:
Specht, M.
Powiązania:
https://bibliotekanauki.pl/articles/223215.pdf
Data publikacji:
2013
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
precyzyjny serwis pozycyjny
standardowy serwis pozycyjny
moduł SAASM
Precise Positioning Service
Standard Positioning Service
SAASM
Opis:
W 2008 roku Departament Obrony USA opublikował dokument Global Positioning Sytem Standard Positioning Service Performance Standard, w którym zawarto wymagania w zakresie dokładności, dostępności, niezawodności, wiarygodności oraz strefy działania serwisu wojskowego GPS (Precise Positioning Service — PPS). Dotychczasowe odbiorniki tego serwisu, aby dokonywać precyzyjnych pomiarów odległości, musiały przeprowadzić proces synchronizacji z serwisem cywilnym (Standard Positioning Service — SPS). Na początku XXI wieku opracowano nową metodę synchronizacji sygnałów serwisu PPS z pominięciem SPS, stąd pojawiły się nowe odbiorniki (Selective Availability Anti-Spoofing Module — SAASM) realizujące tę funkcję. W artykule zaprezentowano wymagania nawigacyjne dla serwisu SPS dotyczące dokładności określenia współrzędnych pozycji oraz przedstawiono wprowadzenie teoretyczne dotyczące wykorzystania modułów SAASM.
In 2008 the United States Department of Defense published a document about Global Positioning System Standard Positioning Service Performance Standard in which there are the requirements in terms of accuracy, availability, reliability, trustworthiness and coverage of the military GPS service (Precise Positioning Service — PPS). Current receivers of this service had to track the synchronization with the civilian GPS service (Standard Positioning Service — SSP) in order to make precise distance measurements. At the beginning of the 21st century there was elaborated a new method to synchronize signals of PPS excluding SPS hence they appeared new receivers (Selective Availability Anti-spoofing Module — SAASM) which perform this function. In the article there were presented the navigational requirements for PPS service and there were submitted the introduction to solutions of SAASM modules used in military applications.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2013, R. 54 nr 3 (194), 3 (194); 147-156
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the positioning accuracy of the EGNOS and DGPS systems based on the long-term measurements in the years 2006-2014
Autorzy:
Specht, M.
Powiązania:
https://bibliotekanauki.pl/articles/92498.pdf
Data publikacji:
2015
Wydawca:
Oddział Kartograficzny Polskiego Towarzystwa Geograficznego
Tematy:
DGPS
EGNOS
GPS
positioning accuracy
long-term measurement campaigns
Opis:
The DGPS (Differential GPS) and EGNOS (European Geostationary Navigation Overlay Service) systems belong to a group of systems supporting the global satellite system GPS (Global Positioning System). These systems have significantly better navigation performance than GPS and, therefore, they are widely used in the maritime, civil and air navigation. The analysis of the positioning accuracy of GPS leads to the conclusion: from year to year the accuracy of the positioning determination increases. The effect of the permanent increasing of the GPS positioning accuracy is the parallel increasing of the positioning accuracies of all the supporting systems. In connection with the constant improvement of the precision characteristics of the above mentioned systems on one hand and the fact, that the users do not possess the current information about the actual status of these characteristics on the other hand, it is reasonable to conduct the periodical research in this area. For that purpose the long-term measurement campaigns were realized in the years 2006-2014; the values of measures, describing the positioning accuracies obtained by both systems, were determined on the basis of those campaigns.
Źródło:
Polish Cartographical Review; 2015, 47, 2; 99-108
2450-6974
Pojawia się w:
Polish Cartographical Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena dokładności określenia pozycji systemów EGNOS i DGPS na podstawie wieloletnich pomiarów w latach 2006–2014
Estimating accuracy of defining position by EGNOS and DGPS systems based on multi-year measurements in 2006–2014
Autorzy:
Specht, M.
Powiązania:
https://bibliotekanauki.pl/articles/204468.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
system DGPS
system EGNOS
system GPS
dokładność określenia pozycji
długoterminowe kampanie pomiarowe
DGPS
EGNOS
GPS
accuracy of positioning
long-term measurement campaigns
Opis:
Systemy DGPS (ang. Differential GPS) i EGNOS (ang. European Geostationary Navigation Overlay Service) zalicza się do grupy satelitarnych systemów wspomagających (ang. Satellite Based Augmentation System – SBAS). Systemy te cechują się znacznie lepszymi charakterystykami nawigacyjnymi niż system GPS, w związku z czym znajdują szerokie zastosowanie w nawigacji morskiej, lądowej i powietrznej. Na podstawie przeprowadzonych analiz stwierdzono, że z roku na rok zwiększa się dokładność określenia pozycji przez system GPS. Skutkiem tego jest równoległe zwiększanie dokładności określenia pozycji przez wszystkie systemy wspomagające. W związku z tym, że charakterystyki dokładnościowe wspomnianych systemów ulegają ciągłej poprawie, a ich użytkownicy nie posiadają bieżącej informacji o aktualnym stanie, to zasadne jest przeprowadzenie okresowych badań w tym zakresie. W tym celu zrealizowano długoterminowe kampanie pomiarowe w latach 2006–2014 i na ich podstawie wyznaczono wartości miar opisujących dokładności określenia pozycji uzyskiwane przez oba systemy.
DGPS and EGNOS belong to a group of satellite based augmentation systems (SBAS). These systems have much better navigational characteristics than the GPS, and therefore are widely used in sea, land and air navigation. On the basis of the analyses follow that the GPS increases the accuracy in determining the position from year to year. The effect is parallel to the increase of accuracy of the positioning delivered by all of augmentation systems. In view of the fact that the accuracy characteristics of these systems are being improved on constant basis and that their users don’t have current information about the actual status, it is reasonable to conduct periodic researches in this area. For this purpose, the long-term measurement campaigns were executed in years 2006–2014, and based on their results they indicated the values of measures describing the accuracy of positions obtained by both systems.
Źródło:
Polski Przegląd Kartograficzny; 2015, T. 47, nr 2, 2; 127-136
0324-8321
Pojawia się w:
Polski Przegląd Kartograficzny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy analysis of GPS sport receivers in dynamic measurements
Autorzy:
Specht, M.
Szot, T.
Powiązania:
https://bibliotekanauki.pl/articles/320899.pdf
Data publikacji:
2012
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
GPS
sport measurements
accuracy
Opis:
Producers of GPS receivers nowadays offer many easy-to-use, mobile units for amateur and professional athletes. Similar functionality parameters and a relatively low price make it difficult for the average user to make a choice. This article compares technical aspects of different GPS devices and presents results of their dynamic accuracy evaluation. Selected GNSS units were divided into two groups: specialized dedicated to sports and GPS data loggers. The tests were carried out on the sports stadium of the Gdansk University of Physical Education and Sport, where the lanes were measured with the use of the GPS Total Station phase receivers Leica GS-15 VIVA, supported by Polish Active Geodetic Network ASG-EUPOS. The ellipsoidal coordinates logged in the GNSS sports receivers were transformed in Gauss-Kruger projection to conformal x, y coordinates and statistical distributions of the predictable accuracy were calculated. The article also discusses other (important from a functional point of view) characteristics of GPS receivers used by athletes.
Źródło:
Annual of Navigation; 2012, No. 19, part 1; 165-176
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Availability of the GNSS geodetic networks position during the hydrographic surveys in the ports
Autorzy:
Specht, C.
Makar, A.
Specht, M.
Powiązania:
https://bibliotekanauki.pl/articles/116211.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
hydrographic survey
IHO S-44
Global Positioning System (GPS)
GLONASS
gedetic network
exclusive order
special order
Opis:
Geodetic network GNSS receivers are more commonly associated with positioning systems used in maritime hydrography. In terms of positioning accuracy when no terrain obstacles are present, they meet international hydrographic surveys standards (S‐44) fully. Those standards are defined as 1m (0.95) for Exclusive Order and 2m (0.95) for Special Order. It is equally as important to ensure access to position which error is not higher than above mentioned maximum values. This is most often determined by the density of port infrastructure. This article presents the results of analysis of availability of hydrographic system that operates based on geodetic GNSS networks. Hydrographic surveys in question were undertaken in inner basins with diverse infrastructure. Three representative types of ports were selected for this reason: fishing type (Hel), medium sized, modern commercial type (Gdynia) and highly congested, narrow canal type (Gdansk – Motlawa). A nonpublic, geodetic GNSS network was used for all surveys. It is worth mentioning that the above network is at the moment the only available network that provides both GPS and GLONASS corrections. The surveys provided evidence that geodetic GNSS networks can be successfully utilised to determine position of hydrographic vessel in low and moderately developed ports as well as in Exclusive and Special Orders. In highly congested ports however, the availability of the above mentioned method of measurement can be insufficient to realise a survey.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 657-661
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of an autonomous/unmanned survey vessel (asv/usv) in bathymetric measurements
Autorzy:
Specht, C.
Świtalski, E.
Specht, M.
Powiązania:
https://bibliotekanauki.pl/articles/258532.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
autonomous
unmanned survey vessel (ASV/USV)
bathymetric measurements
digital sea bottom model
bathymetric map
Opis:
The accuracy of bathymetric maps, especially in the coastal zone, is very important from the point of view of safety of navigation and transport. Due to the continuous change in shape of the seabed, these maps are fast becoming outdated for precise navigation. Therefore, it is necessary to perform periodical bathymetric measurements to keep them updated on a current basis. At present, none of the institutions in Poland (maritime offices, Hydrographic Office of the Polish Navy) which are responsible for implementation of this type of measurements has at their disposal a hydrographic vessel capable of carrying out measurements for shallow waters (at depths below 1 m). This results in emergence of large areas for which no measurement data have been obtained and, consequently, the maps in the coastal zones are rather unreliable. The article presents the concept of bathymetric measurements for shallow waters with the use of an autonomous, unmanned survey vessel (ASV/USV). For this purpose, the authors modernized a typical ASV/USV unit with standard radio remote control system to the fully autonomous mode. As part of the modernization, the route planning software was created. The developed software works based on, alternatively, GNSS measurements of the coastline, or satellite images. The system was supplemented by an own autopilot (adapted for flying drones). Moreover, the method of controlling electric motors was changed thanks to the use of own electronic circuit. The modernized ASV/USV measuring system was verified by performing bathymetric measurements of the retention reservoir in Gdansk, Poland. Then, the obtained measurement data were used to create a digital bottom model and a bathymetric map of the reservoir.
Źródło:
Polish Maritime Research; 2017, 3; 36-44
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polish DGPS System: 1995-2018 – studies of reference station operating zones
Autorzy:
Specht, C.
Specht, M.
Dąbrowski, P. S.
Powiązania:
https://bibliotekanauki.pl/articles/117143.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
Polish DGPS System
reference station operating zones
history of navigation
Differential GPS (DGPS)
DGPS Reference Station
positioning system
Global Positioning System (GPS)
Opis:
The operating zone of a radio navigation system is one of its main operating features. It determines the size of a water body in which the system can be used, while guaranteeing vessels’ navigation safety. The DGPS system in the LF/MF range is now the basic positioning system in coastal waters around the world, which guarantees not only metre positioning accuracy, but it is also the only one to provide navigators with signals on positioning reliability. This paper describes and summarises over twenty years of studies dealing with the operating zone of the Polish DGPS reference station network. This paper is the fifth in a series of publications whose aim was to present in detail the process of installation, testing and long-term evaluation of the navigational parameters of the Polish DGPS system, launched in 1995. This paper includes the theoretical foundations of determination of the Dziwnów and Rozewie DGPS reference station operating zones in the years 1995-2018. Moreover, it presents the measurement results for the signal levels and the results of their analyses, which determine the station operating zones.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 3; 581-586
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy of the GPS positioning system in the context of increasing the number of satellites in the constellation
Autorzy:
Specht, C.
Mania, M.
Skora, M.
Specht, M.
Powiązania:
https://bibliotekanauki.pl/articles/259507.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
GPS
User Range Error
Dilution of Precision
GPS Almanac
Accuracy of Positioning
Opis:
A possibility of utilising the GPS system for navigation and transport are fundamentally dependent on the accuracy in positioning. Two fundamental factors decisive for its value are the values of the User Range Error (URE) and Dilution of Precision (DOP), strictly related to the number of satellites forming the constellation. The nominal constellation of GPS satellites consists of 24 units which gives a possibility of identification of coordinates all over the globe. In the last few years, however, the nominal number of satellites in the constellation was much higher, and the URE value has been constantly increasing. The authors of the paper try to estimate the impact of the changing number of GPS satellites on accuracy of position coordinates with a variable URE value. Mathematical model for estimating geometrical indicators’ value, utilizing data derived from the almanac files has been presented. Following a drawn-up algorithm and calculations made with Mathcad software, the authors carried out a comparative analysis of mean daily values of DOP indicators for a variable number of satellites included in the GPS constellation in the years 2001-2013. Then, the authors have established representative values of Two Distance Root Mean Square Error (2drms) 2D and 3D, and calculated a percentage increase of accuracy in the period under discussion.
Źródło:
Polish Maritime Research; 2015, 2; 9-14
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Hydrotechnical Structures on Forming the Tombolo Oceanographic Phenomenon in Kołobrzeg and Sopot
Autorzy:
Specht, C.
Lewicka, O.
Specht, M.
Zblewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2063963.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
oceanographic phenomenon
hydrotechnical structures
Tombolo
Sopot
Port of Kolobrzeg
sea level
Polish Ports
Opis:
The process of global sea level rise is causing several significant changes in the coastal zone. Sea level rise and the frequency, strength and duration of storms are also occurring on the Polish coast. As a result, coastal protection measures, such as man-made engineering structure, are necessary. These engineering structures affect (among others) the marine ecosystem in different ways. Although the presence of such engineering structures can cause changes in the bathymetry of waterbody and the transport of sediments along the basin, it also slows down the erosion of the shoreline. For this reason, comprehensive knowledge of natural conditions, including dynamic and variable factors, is essential in the construction of a hydro-engineering structures. The correct determination of the environmental conditions helps to minimize environmental damage. Prior to interventions on the coast, the issues addressed in the paper should be analysed and studied. In this paper, the influence of shoreline structures on the main factors responsible for the development of tombolo phenomenon is discussed. In addition, the lithological diversity of surface sediments on which the rate of coastal erosion depends, is also discussed. An important element of the work is the descriptions of tombolo in Poland. They contain information on the causes of the phenomenon, as well as about the negative consequences of a disturbance of the hydrodynamic dynamics caused by the structure.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 687--694
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of unmanned aerial vehicles used in photogrammetric surveys
Autorzy:
Specht, M.
Widźgowski, S.
Stateczny, A.
Specht, C.
Lewicka, O.
Powiązania:
https://bibliotekanauki.pl/articles/24201468.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
unmanned aerial vehicle
unmanned vehicles
photogrammetry
drone
inertial navigation system
hydrography
Global Navigation Satellite System
LiDAR
Opis:
There are many manufacturers on the market offering various types of Unmanned Aerial Vehicles (UAV). The multitude of drones available on the market means that the choice of a UAV for a specific application appears to be a decision problem to be solved. The aim of this article is a comparative analysis of drones used in photogrammetric surveys. The criteria for evaluating the UAVs were: availability and product support, payload (min. 5 kg), price (PLN 100,000), as well as space available for measurement modules. These are the requirements that must be met for the implementation of the INNOBAT project, the aim of which is to develop an integrated system using autonomous unmanned aerial and surface vehicles, intended for bathymetric monitoring in the coastal zone. The comparative analysis of drones was based on 27 companies producing UAV. Based on the analysis, 6 drones that met the project requirements were selected. They were: Aurelia X6 Pro, Aurelia X8 Standard LE, DroneHexa AG, FOX-C8 XT, Hercules 10 and Zoe X4. Selected UAVs differ from each other, among others, in the number of rotors, flight duration and resistance to weather conditions. Individual characteristics of drones may have a different rank depending on their application, therefore the selection of UAVs should be made after prioritisation criteria of a given project.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 433--443
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shoreline extraction based on LiDAR data obtained using an USV
Autorzy:
Halicki, A.
Specht, M.
Stateczny, A.
Specht, C.
Lewicka, O.
Powiązania:
https://bibliotekanauki.pl/articles/24201469.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
shoreline
LiDAR
laser scanning
Unmanned Surface Vessel
unmanned vehicles
hydrography
geodesy
Opis:
This article explores the use of Light Detection And Ranging (LiDAR) derived point clouds to extract the shoreline of the Lake Kłodno (Poland), based on their geometry properties. The data collection was performed using the Velodyne VLP-16 laser scanner, which was mounted on the HydroDron Unmanned Surface Vehicle (USV). A modified version of the shoreline extraction method proposed by Xu et al. was employed, comprising of the following steps: (1) classifying the point cloud using the Euclidean cluster extraction with a tolerance parameter of 1 m and min. cluster size of 10,000 points, (2) further filtration of boundary points by removing those with height above 1 m from the measured elevation of water surface, (3) manual determination of a curve consisting of 5 points located along the entire shoreline extraction region at a relatively constant distant from the coast, (4) removal of points that are further from the curve than the average distance, repeated twice. The method was tested on the scanned section of the lake shoreline for which Ground Control Points (GCP) were measured using a Global Navigation Satellite System (GNSS) Real Time Kinematic (RTK) receiver. Then, the results were compared to the ground truth data, obtaining an average position error of 2.12 m with a standard deviation of 1.11 m. The max error was 5.54 m, while the min. error was 0.41 m, all calculated on 281 extracted shoreline points. Despite the limitations of this parametric, semi-supervised approach, those preliminary results demonstrate the potential for accurate shoreline extraction based on LiDAR data obtained using an USV. Further testing and optimisation of this method for larger scale and better generalisation for different waterbodies are necessary to fully assess its effectiveness and feasibility. In this context, it is essential to develop computationally efficient methods for approximating shorelines that can accurately determine their course based on a set of points.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 445--453
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of a least squares with conditional equations method in positioning a tramway track in the Gdansk agglomeration
Autorzy:
Czaplewski, K.
Specht, C.
Dąbrowski, P.
Specht, M.
Wiśniewski, Z.
Koc, W.
Wilk, A.
Karwowski, K.
Chrostowski, P.
Szmagliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/116443.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Least Squares Method (LSQ)
Conditional Equations Method
tramway track
Gdansk Agglomeration
MathCad
rail vehicle trajectory
Global Positioning System (GPS)
satNav receiver
Opis:
Satellite measurement techniques have been used for many years in different types of human activity, including work related to staking out and making use of rail infrastructure. First and foremost, satellite techniques are applied to determine the tramway track course and to analyse the changes of its position during its operation. This paper proposes using the least squares with conditional equations method, known in geodesy (LSce). When applied, this method will allow for improvement of the final determination accuracy. This paper presents a simplified solution to the LSce alignment problem. The simplification involves replacement of the parameter binding equations with equivalent observational equations with properly selected weights. The results obtained with such a solution were demonstrated with a randomly selected section of a tramway track in Gdańsk. The article presents the theoretical foundations of the test method, the experiment organisation and the results obtained with MathCad Prime 3.0 software. It also presents the outcome of a study associated with the execution of the project No POIR.04.01.01-00-0017/17 entitled “Developing an innovative method of precision determination of a rail vehicle trajectory” executed by a consortium of the Gdańsk University of Technology and Gdynia Maritime University.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 4; 895-900
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza wybranych aktywnych sieci geodezyjnych
Comparative analysis of selected active geodetic networks
Autorzy:
Specht, C.
Skóra, M.
Powiązania:
https://bibliotekanauki.pl/articles/222633.pdf
Data publikacji:
2009
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
aktywne sieci geodezyjne
ASG-EUPOS
CORS
SAPOS
SWEPO
OS-AGN
active geodetic networks
OS - AGN
Opis:
W artykule przedstawiono uruchomioną w czerwcu 2008 roku polską aktywną sieć geodezyjną ASG-EUPOS na tle wybranych aktywnych sieci geodezyjnych działających na świecie. W zasadniczej części publikacji wyróżniono przestrzeń porównawczą obejmującą architekturę i usługi (serwisy) wraz z metodami radiowej transmisji danych telemetrycznych zgodnych ze standardem RTCM SC-104. Artykuł kończą uogólnione wnioski przedstawiające zalety poszczególnych rozwiązań, które mogą być pomocne przy modernizacji systemów obecnie eksploatowanych oraz projektowaniu i budowie analogicznych.
The article presents comparable analyses between the Polish Active Geodetic Network ASG-EUPOS established in June 2008 and other selected networks like: CORS (US), SAPOS (Germany), SWEPOS (Sweden), OS - AGN (UK). Architecture, services and methods of GPS pseudorange correction transmission according to RTCM SC-104 standard were used for comparisons. Advantages and disadvantages of different national active geodetic network solutions are presented as conclusions.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2009, R. 50 nr 3 (178), 3 (178); 39-54
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planning GPS Measurements of a Linear Object for a Specififed Time Interval
Autorzy:
Specht, C.
Skóra, M.
Powiązania:
https://bibliotekanauki.pl/articles/320923.pdf
Data publikacji:
2017
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
GPS
almanac
position accuracy
GNSS measurements planning
Opis:
The previous measurement campaigns planning used in geodesy is conducted exclusively for individual points. For the natural process aimed at the adoption of the introduction of the planning (prediction of constellation state) in navigation, which is characterized by the movement, one should adopt measurement campaigns planning for linear objects. In contrast to the existing planning solutions, focused on point presentation of the state of the constellation of navigation system, the author of this article rearranges the proposal of determination of geometrical factors, and their summation. In the presented simulation, one has specified the route of passing at certain times and it was assumed that the receiver will move with variable motion. One has defined the geometric ratios (PDOP), which allow to distinguish the results corresponding to the adopted criteria for the measurement of linear object to be conducted with the best possible accuracy.
Dotychczasowe planowanie kampanii pomiarowych w geodezji odbywa się wyłącznie dla pojedynczych punktów. Za naturalny proces ukierunkowany na wprowadzenie planowania (predykcji stanu konstelacji) w nawigacji, którą cechuje ruch, należy przyjąć planowanie kampanii pomiarowych dla obiektów liniowych. W przeciwieństwie do dotychczasowych rozwiązań, skupionych na punktowym przedstawieniu stanu konstelacji systemu nawigacyjnego, autorzy przestawiają propozycję określania współczynników geometrycznych, a następnie ich sumowania. W symulacji określono trasę przejazdu w konkretnych godzinach i przyjęto, że odbiornik będzie poruszać się ruchem zmiennym. Określono też współczynniki geometryczne (PDOP), które pozwalają wyróżnić odpowiadające przyjętym kryteriom wyniki, by pomiar obiektu liniowego odbył się z jak największą dokładnością.
Źródło:
Annual of Navigation; 2017, 24; 75-88
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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