Stations and Datum Transformation

Transcription

1 Continuously Operating Referene Stations and Datum Transformation (CORS-TR) Ali Kılıçoğlu Geodesy Department, GCM Turkey EUREF 2009, May 2009, Firenze, Italy

2 147 CORS 2 Control Centers 7/24 RTK service Datum Transformation Surveying and mappin Cadstral works Geographical Information Systems Land registry e-goverment

3 Granted by Turkish National Research Council (TÜBİTAK) Customers General Command of Mapping General Directorate t of Land Register and Cadastre Implementing Institute Istanbul Culture University it

4 CORS-TR Stations Existing permanent st. (27) CORS_TR st. (147)

5 CORS-TR STATIONS geological basement characteristics, stability, electricity, internet connection and security issues Mainly in Meteorological Stations, Universities, Municipalities, Other govermental buildings and fields.

6 CORS-TR ROOF TYPE PILLAR

7 CORS-TR GROUND TYPE PILLAR

8 KONYA Permanent GPS Station

9 DGPS/RTK NETWORK STRUCTURE GNSS Satellite Comm. Satellite GNSS Satellite Control Center 2 RTCM, CMR+ 4 3 CORS-TR station 2 NMEA Users GPRS

10 CORS-TR Control Center RTK Corrections will be computed and send to users in real time. Additionally, 30 second GNSS data Additionally, 30 second GNSS data will be stored for post-processing and will be available for users via internet.

11 CORS-TR Station ti

12 Networked Transport of RTCM via Internet Protocol will be used. DGPS/RTK Gezici Alıcı RS232 NTRIP Client HTTP HTTP NTRIP Server.. GPRS BlueTooth NTRIP CASTER COM port.. Referans Alıcısı DGPS/RTK Gezici Alıcı NTRIP Client HTTP HTTP ADSL / GPRS NTRIP Server Referans Alıcısı NTRIP, http based general and independent protocol, has been developed by BKG/Germany so as to broadcast differential corrections and other types of GNSS information to users via internet.

13 Edirne Kirklareli CLASSICAL DGPS/RTK SARAY Single stations and covering area (5, 7.5 and 10 km radius) Catalca Tekirdag Istanbul KESAN Canakkale kilometers Accuracy, Reliability, Availability good bad

14 NETWORK DGPS/RTK Edirne Kirklareli Network stations and covering area SARAY (40 and 50 km radius) Catalca Tekirdag Istanbul KESAN Canakkale kilometers Accuracy, Reliability, Availability good bad

15 CORS-TR DGPS/RTK NETWORK Interstation distances; mean 80 km, maximum 100 km.

16 PROCESSING OF CORS-TR GPS DATA Exisitng Permanant stations (tusa) 1st Group CORS-TR st. (tus1) 2nd Group CORS-TR st. (tus2) 3rd Group CORS-TR st. (tus3) 4th Group CORS-TR st. (tus4)

17 CORS-TR DATA PROCESSING ERP Bulletin B Global solution files higs1a.* higs2a* higs3a* Station data (daily) TUSAGA CORS-TR IGS IGS Final orbit GAMIT Soluton files htusaa.* htus1a.* htus2a.* htus3a.* higs4a* higs5a.* GLRED Time series Monthly combinations GLOBK GLRED Time series Coordinates and velocities (ITRF2005) GLOBK htus4a.* İn case gross eroors in case gross errors GLORG velocities (EUREF)

18 Regional IGS Stations used in the data processing

19 Global IGS Stations used in the data processing

20 Long term time series of exisiting permanent stations

21 Long term time series analysis

22 (Short term) Time series of COSR-TR stations

23 For an accurate velocity Estimation (> 2.5 year); East component : MATE ONSA WTZR GRAZ VILL TRAB ANKR ISTA AKHI North Component : MATE ONSA WTZR GRAZ VILL TRAB ANKR ISTA AKHI Up Component : MATE ONSA WTZR GRAZ VILL TRAB ANKR ISTA AKHI

24 Determination of CORS-TR station coordinates in TUREF

25 CORS-TR Horizontal Velocity Field wrt Eurasia (short term)

26 GPS meteorology Preceptable Water Vapor (PW)

27 28 Comparison (PW/GPS and PW/Radiosonde) 20/04/..yağış yok. 21/04/ <0.1 kg 22/04/ kg /04/ < 0.1 kg 22/04/ kg 22/04/ kg. 23/04/ kg /04/ kg 23/04/ kg 24/04/.. No rain. 16 Radiosonde_PW 12 8 GPS_PW April 2005

28 6 and 12 hour rain forecasts 25 Oct 00:00-25 Oct 06:00 25 Oct 00:00-26 Oct 00:00 Rain 26 Oct 12:00 18:00 at maximum level.

29 Datum transformation works (ED50/WGS84) Planned GPS obs. ~3000 stations

30 CORS-TR has been operational since May At the moment, corrections are provided in RTCM/CMR+ format via GPRS/EDGE and single frequency receivers (for DGPS) and dual frequency receivers (for RTK) with GPRS modems are able to receive corrections.

31 Rover GPS Receivers : Should be dual frequency, be able to receive carrier phase corrections (RTCM/CMR) and be able to solve ambiguity with its own software.

32 NNRT ANATOLIA EURASIA ARABIA

33 ETRS-89 vs TUREF Coor. Diff. Caused by Anatolian velocity wrt Eurasia East comp. (mm) ETRS-89 vs TUREF North Comp (mm)

34 Thanks for your attention.