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1
Content available Analysis of the determination of the accuracy parameter for dual receivers based on egnos solution in aerial navigation
Krasuski Kamil, Ćwiklak Janusz, Bakuła Mieczysław, Mrozik Magda
Acta Mechanica et Automatica
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2022
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Vol. 16, no. 4
365--372
EN
The paper presents the results of research on the determination of the accuracy parameter for European Geostationary Navigation Overlay System (EGNOS) positioning for a dual set of on-board global navigation satellite system (GNSS) receivers. The study focusses in particular on presenting a modified algorithm to determine the accuracy of EGNOS positioning for a mixed model with measurement weights. The mathematical algorithm considers the measurement weights as a function of the squared inverse and the inverse of the position dilution of precision (PDOP) geometrical coefficient. The research uses actual EGNOS measurement data recorded by two on-board GNSS receivers installed in a Diamond DA 20-C airplane. The calculations determined the accuracy of EGNOS positioning separately for each receiver and the resultant value for the set of two GNSS receivers. Based on the conducted tests, it was determined that the mixed model with measurement weights in the form of a function of the inverse square of the PDOP geometrical coefficient was the most efficient and that it improved the accuracy of EGNOS positioning by 37%–63% compared to the results of position errors calculated separately for each GNSS receiver.
2
Content available Research and Development of Real-time High-precision GNSS Receivers: A Feasible Application for Surveying and Mapping in Vietnam
Pham Cong Khai, Nguyen Gia Trong, Nguyen Van Hai, Tran Trong Xuan
Inżynieria Mineralna
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2021
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no. 2
391--404
EN
In recent years, the Global Navigation Satellite System (GNSS) has been widely applied in surveying and mapping. Currently, in Vietnam, dual-frequency GNSS receivers are quite extensively applied with the real-time kinematic (RTK) measurement technique using a continuously operating reference station network. However, high-accuracy GNSS receivers are often expensive, sometimes not meeting the needs of users for specific applications. This research develops two types of low-cost highprecision GNSS receivers for RTK positioning for different purposes. First, the millimeter precision GNSS receiver used in real-time displacement monitoring is based on Trimble's BD970 mainboard technology and some other modules. These components are interconnected according to a standard design scheme and assembled in an enclosure to form a GNSS receiver. In addition, a GNSS data transmission in the National Marine Electronics Association standard format by Networked Transport of Radio Technical Commission for Maritime Services via Internet Protocol (NTRIP) has been designed and developed. The GNSS receiver after development is loaded with program code written in the C# programming language, using the Arduino programming tool. Second, the GNSS receivers have the centimeter accuracy for RTK positioning used in surveying and mapping based on U-blox's mainboard technology and some other modules. These modules are also connected together according to a standard design scheme and assembled in an enclosure to form a complete GNSS receiver. The evaluation results show that the designed and developed GNSS receivers completely meet the requirements of surveying and mapping in coal mines in Vietnam, such as real-time monitoring of landslides, surveying and topographical mapping and other surveying works to serve the mining process.
3
Content available remote Chińska inercja
Królikowski Jerzy
Geodeta : magazyn geoinformacyjny
|
2021
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nr 2
14--16
4
Metoda taksonomii wrocławskiej w ocenie odbiorników GNSS
Dudczyk Janusz, Zmysłowski Dariusz
Elektronika : konstrukcje, technologie, zastosowania
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2019
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Vol. 60, nr 1
23--27
PL
Celem artykułu jest przedstawienie koncepcji zastosowania metody taksonomii wrocławskiej w procesie badań zdatności i certyfikacji odbiorników GNSS (ang. Global Navigation Satellite Systems). W pracy opisano ideę taksonomii wrocławskiej wraz z algorytmem określania podobieństw badanych obiektów do obiektu wzorcowego. Poddano analizie zbiór parametrów technicznych odbiorników GNSS pod kątem wyboru cech odbiornika odniesienia. Opisano również algorytm wyliczania podobieństwa badanych odbiorników GNSS w odniesieniu do wzorca. Ponadto przeanalizowano obszary zastosowania prezentowanej koncepcji w praktycznym badaniu zdatności eksploatowanych odbiorników GNSS, sprawdzaniu zgodności parametrów produkowanych odbiorników z wymaganiami funkcjonalno-technicznymi stawianymi na etapie projektowania. W procesie analizy odniesiono się do obowiązujących zaleceń i norm dotyczących badań standaryzacyjnych i akredytacyjnych wyrobów oraz definiujących wymagania stawiane przed odbiornikami GNSS.
EN
The purpose of this article is to present the concept of using Wroclaw Taxonomy in the process of evaluation of availability and certification of GNSS receivers. The idea of Wroclaw Taxonomy is described along with the algorithm of determining the likeness of tested objects and reference objects. An analysis of GNSS receivers’ set of technical parameters was carried out in terms of choosing the characteristics of a standard receiver. An algorithm of calculating the similarity of tested GNSS receivers in reference to the standard receiver is also described. Furthermore, an analysis of areas of application of the presented concept was carried out in practical evaluation of availability of GNSS receivers, verifying the compatibility of parameters of produced receivers with functional and technical requirements posed at the designing stage. In the process of analysis, recommendations concerning standardization and accreditation tests of products as well as the ones defining the requirements for GNSS receivers were taken into account.
5
Content available Experimental analysis of navigational precision for dedicated GNSS receivers
Słowik M., Mrozek T.
Acta Mechanica et Automatica
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2016
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Vol. 10, no. 4
253--257
EN
In the paper experimental investigations related with analysis of navigational precision of three chosen GNSS receivers are shown. Used receivers allow for measurement of navigational signals in following modes of operations: receiving signals from singlefrequency GPS system, dual-frequency GPS/GLONASS system, and receiving signals from GPS constellation with use of differential measurements. In the last mode the base station and mobile receiver were configured for transmitting/receiving differential corrections by pair of industry-grade radio modems. The most important features and configuration of navigational receivers for conducted experiment are presented. Afterward the features of computer program designed especially for simultaneous acquisition, analysis of quality parameters and archiving of navigational signals are shown. The results of conducted investigations are also shown. For each of the receivers quantity and quality parameters such as maximum and minimum numbers of visible satellites and DOP (dilution of precision) parameters achieved during the experiment are given.
6
Content available GNSS receivers, theirs features, user environment and applications
Januszewski J.
Annual of Navigation
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2014
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No. 21
49--58
EN
Since many years the coordinates of the position can be obtained with the use of satellite navigation and augmentation systems, SNS and SBAS, respectively. All these systems are called GNSS (Global Navigation Satellite Systems). The main task of the user segment is to transform the products delivered by the GNSS infrastructure into services that users are mainly interested in. That’s why GNSS receiver selection depends on user application. Nowadays several hundred different receivers provided by more than one hundred manufacturers are available on the world market. The review of the performance parameters of GNSS receivers accessible in 2014 and last three years is presented in this paper. Additionally the paper gives the reply to some important questions as: for how many applications the given model is destined, which is the percentage of the receivers designed for marine and navigation users, which equipment features of the receiver are the most important for given application, which satellite signals apart from GPS signals can be tracked in the receiver?
PL
Współrzędne pozycji można otrzymać z użyciem nawigacji satelitarnej i systemów wspomagających, odpowiednio GNSS i SBAS. Wszystkie są nazywane mianem GNSS (globalne, nawigacyjne systemy satelitarne). Zadaniem głównym segmentu użytkownika tych systemów jest przekształcenie sygnałów dostarczanych przez infrastrukturę GNSS w usługi, którymi jest on najbardziej zainteresowany, dlatego wybór rodzaju odbiornika GNSS zależy od indywidualnych potrzeb. Obecnie na światowym rynku dostępnych jest kilkaset różnych odbiorników oferowanych przez ponad stu producentów. W artykule przedstawiono przegląd parametrów odbiorników GNSS dostępnych w 2014 roku i w trzech poprzednich latach. Dodatkowo artykuł daje odpowiedź na pytania, dla ilu zastosowań dany model jest przeznaczony, jaki procent odbiorników jest przydatny dla zastosowań morskich, które z cech odbiornika są najważniejsze dla użytkownika, które systemy, oprócz GPS, mogą być śledzone w odbiorniku.
7
Content available remote Trzy stopnie wtajemniczenia
Królikowski J.
Geodeta : magazyn geoinformacyjny
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2013
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nr 8
34--41
8
Content available remote Odbiornik, który może więcej
Królikowski J.
Geodeta : magazyn geoinformacyjny
|
2013
|
nr 6
40--42
9
Content available remote Klęska urodzaju
Królikowski J.
Geodeta : magazyn geoinformacyjny
|
2013
|
nr 7
40--45
10
Content available remote GNSS receiver zero baseline test using GPS signal generator
Dróżdż M., Szpunar R.
Artificial Satellites : Journal of Planetary Geodesy
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2012
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Vol. 47, No. 1
13--22
EN
Validation of the performance of GPS receivers is crucial for many applications. This paper presents testing GPS receivers with the use of a GPS signal simulator. Unlike live testing, testing with simulators provides full control of simulated satellite signals and simulation environmental conditions. Moreover, generating repeatable signals makes possible to extend typical procedures. It allows to determine the absolute value of the position precision for each receiver without relation to any other one.
11
Content available remote MobileMapper 100
Królikowski J.
Geodeta : magazyn geoinformacyjny
|
2010
|
nr 12
54-56
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