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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

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2012

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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.

2

GPS/EGNOS positioning of archeological site in Pompeii

Manzoni G., Inchingolo D., Manzoni M., Martinolli S., Oriolo F., Oszczak S., Ciecko A., Oszczak B., Sanna G. M., Dessi A., Pusceddu L., Crocetto N., Ponte S., Crisci M., Caroti G., Bedini A., Micheloni J., Tronconi M., Mussumeci G., Lombardo C., Guarnieri A., Pontin M., Migliore A., Silvestre G.

Reports on Geodesy

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2004

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nr 2/69

335--340

EN

The paper presents the results of GPS and EGNOS satellite experiments performed in Pompeia's archeological site. The main goals of the experiments were as follows: 1. Establishment of GPS control point network on the streets of this ancient city, 2. Examination of GPS/RTK OTF method with different types of receivers and teletransmission lines, 3. Examination of EGNOS (ESTB) performance and positioning accuracy. The experiments were conducted jointly by the teams of Italian Universities in: Trieste, Napoli Seconda, Salerno, Catania, Cagliari, Pisa and Padova and the team of the Chair of Satellite Geodesy and Navigation of the University of Warmia and Mazury in Olsztyn, Poland in July 2003 and thanks to the very kind and valuable help ofPompei's Sopraintendenza Archeologica. Different receivers were taking part in the experiments including Ashtech, Javad, Leica, Tumble, Garmin and Magellan receivers. The results of EGNOS (ESTB) satellite positioning are compared with performance of precise RTK OTF method. Estimation of accuracy of ESTB satellite positioning is done. The results are presented and discussed.

3

Kinematic positioning using EGNOS system test bed (ESTB) in Central European Countries in 2002

Ciecko A., Oszczak S., Popielarczyk D., Bakuła M., Cefalo R., Manzoni G., Balint J.

Reports on Geodesy

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2003

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z. 1/64

245-255

EN

The paper describes three experiments performed in Poland, Slovakia and Italy. The experiments concern navigation and positioning of a moving vehicle with the use of GPS satellite system and the corrections from EGNOS satellites. Tests were performed in cooperation of University of Warmia and Mazury in Olsztyn, Poland; University of Trieste, Italy and Air Force Academy in Kosice, Slovakia. Experiments were carried out in the August and September 2002. Different receivers were taking part in the experiments including Ashtech, NovAtel and Magellan receivers. The results of ESTB satellite positioning are compared with performance oC precise RTK - OTF method. Estimation of accuracy of ESTB satellite positioning is done. The results are presented and discussed.

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Determination of accuracy and coverage of permanent reference station (DGPS/RTK)

Ciecko A., Oszczak S., Oszczak B.

Reports on Geodesy

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2003

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z. 2/65

45-51

EN

The paper describes the experiment performed in Gdynia in January - February 2003. Permanent reference station in Gdynia equipped with Ashtech Z-FX receiver and Satel 3 AS-Epic radiomodem was used. The corrections were transmitted in the RTCM format. In the project over 30 control points were chosen for testing of accuracy and coverage of DGPS/RTK corrections. The measurement sessions lasted about one hour for each of the control points. The internal memory card of the receiver stored raw observation data (B,E,S-files) as well as C-file with RTK positions (1 second interval). The comparisons between static and real time GPS positioning results as well as catalogue coordinates of control points derived with classical techniques were done. The obtained results were discussed and conclusions for real time satellite positioning using Gdynia DGPS/RTK permanent rererence station are presented.

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Aircraft trajectory determination and accuracy estimation of different GPS methods

Ciecko A., Bakuła M., Oszczak S., Grzegorzewski M.

Reports on Geodesy

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2002

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z. 3/63

61-68

EN

The paper presents the results of accuracy estimation of airplane trajectory with GPS methods. The analyses cover such GPS methods as: OTF post-processing mode, DGPS with smoothed pseudoranges, DGPS with carrier phases and stand alone mode with SA off. The experiments were performed in April 2001 (SA off) in the central part of Poland and covered two hundred kilometres long flights. The GPS observations were carried out with Ashtech GPS receivers (Ashtech Z-Surveyor, Ashtech Z-FX, Ashtech Z-XII). Six GPS reference stations were used during the experiments, located along the aircraft trajectory. Ashtech Z-Surveyor receiver, working as a rover, was placed onboard of the TS11 ISKRA plane. Positions of the aircraft trajectory were determined independently, on the basis of every reference station. Standard deviations were calculated for each epoch of the flight (one second interval). The results of the performed analyses show that methods of integrated pseudoranges and carrier phases significantly improve the accuracy of aircraft positioning. GPS data were elaborated with the use of PNAV software (Precise Navigation Software) and AOSS (Ashtech Office Suite for Survey) - products of Ashtech company.