Wyniki wyszukiwania - BazTech

1

Extension of EGNOS ionospheric correction coverage area

Swiatek A., Stanislawska I., Zbyszynski Z., Dziak-Jankowska B.

Acta Geophysica

|

2014

|

Vol. 62, no. 1

259--269

EN

Ionosphere coverage is likely to be a driver for the EGNOS coverage area. Hence, a study considering a dedicated ionosphere algorithm to improve the ionosphere coverage area has been conducted. The logic of the study is the following: the accuracy of the GPS signal depends mainly on the total electron content (TEC). At two close points, TEC changes in time in a very similar way; these are region dependent variables. This correlation decreases with growing distance between the observation points and is anisotropic. Based on TEC variogram analysis, the specific algorithm has been developed. This specific algorithm is presented and discussed.

2

EGNOS limitations over central and eastern Poland - results of preliminary tests of EGNOS-EUPOS Integration project

Jaworski L., Swiatek A., Zdunek R.

Artificial Satellites : Journal of Planetary Geodesy

|

2013

|

Vol. 48, No. 3

93--102

EN

The problem of insufficient accuracy of EGNOS correction for the territory of Poland, located at the edge of EGNOS range is well known. The EEI PECS project (EGNOS EUPOS Integration) assumes improving the EGNOS correction by using the GPS observations from Polish ASG-EUPOS stations. One of the EEI project tasks was the identification of EGNOS performance limitations over Poland and services for EGNOSS-EUPOS combination. The two sets of data were used for those goals: statistical, theoretical data obtained using the SBAS simulator software, real data obtained during the measurements. The real measurements were managed as two types of measurements: static and dynamic. Static measurements are continuously managing using Septentrio PolaRx2 receiver. The SRC permanent station works in IMAGE/PERFECT project. Dynamic measurements were managed using the Mobile GPS Laboratory (MGL). Receivers (geodetic and navigation) were working in two modes: determining navigation position from standalone GPS, determining navigation position from GPS plus EGNOS correction. The paper presents results of measurements’ analyses and conclusions based on which the next tasks in EEI project are completed.

3

Study of EGNOS safety of life service during the period of solar maximum activity

Grzegorzewski M., Swiatek A., Oszczak S., Ciecko A., Cwiklak J.

Artificial Satellites : Journal of Planetary Geodesy

|

2012

|

Vol. 47, No. 4

137--145

EN

The Satellite Base Augmentation System (SBAS) - EGNOS (European Geostationary Navigation Overlay Service) has been certified for Safety of Life (SoL) service for aircraft navigation since 2nd of March 2011. Unfortunately for the territory of Poland, located at the edge of EGNOS service area, the quality of the service corrections are still not sufficient for aircraft navigation requirements. Years 2012 and 2013 are forecasted as a maximum of solar activity in a 11-year solar cycle. This time period will be the chance to perform the first tests for the EGNOS Safety of Life service quality in disturbed ionospheric conditions. During the previous maximum of solar activity, the storm on 30 October 2003 resulted in the inability to use WAAS corrections for more than 12 hours. This was caused by a very large gradient of disturbances and its’ very sharp boundaries – vertical TEC (VTEC) varied from ~ 40 to ~ 120 TECU (TEC units) within an hour (over ~ 150 km distance). These circumstances gave the opportunity to carry out the test flights to examine the navigation parameters obtained for EGNOS SoL service in disturbed ionospheric conditions. The paper presents project proposal of study and analyses of such fundamental navigation parameters as: accuracy of determined position, availability, continuity and integrity, determined for selected disturbances in relation to quiet conditions. It can give a possibility to estimate of the quality of EGNOS SoL service in Polish airspace during the different phases of flight and its resistance to critical ionospheric conditions.

4

Comparison of coordinates of POLREF - the first order Polish national network - obtained from campaigns in 1994/95 and 2008/2010

Jaworski L., Swiatek A.

Artificial Satellites : Journal of Planetary Geodesy

|

2012

|

Vol. 47, No. 3

111--125

EN

The integration of ASG-EUPOS network with the national first order networks was prepared in two measurement campaigns carried out in 2008 and 2010/2011. The measurements included a total of 340 points of POLREF - the first order national GNSS network. That set of data gives the possibility for comparison of solutions prepared for comprehensive analysis of the points’ position and coordinates changes in the long term. Because the results of POLREF were not published the paper includes a brief description of campaigns from 1994 and 1995 and prepared solutions as well as the results of coordinates comparison with campaigns 2008 and 2010/2011. For points of significant deviations in coordinates the analysis of causes was presented.

5

Integration of the ASG-EUPOS permanent stations with first order national geodetic networks - measurements and results

Jaworski L., Swiatek A., Zdunek R., Zieliński J. B.

Artificial Satellites : Journal of Planetary Geodesy

|

2011

|

Vol. 46, No. 4

165--174

EN

The ASG-EUPOS network - the active geodetic network was established in Poland in 2008. The 2010/2011 campaign was the second one managed to integrate the ASG-EUPOS network with the first order national geodetic networks in Poland. As the result the station coordinates were determined in the uniform coordinate frame. The paper describes the measurements carried out for data acquisition as well as the data processing method. The results present analyses of differences between selected variants of solutions and show some problems encountered during the calculation.