MONITORING OF STATION VYHL

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1 LONG-TERM POSITIONAL MONITORING OF STATION VYHL OF THE SNĚŽ ĚŽNÍK NETWORK Josef Weigel, Otakar Švábenský Brno University of Technology Department of Geodesy fce.vutbr.cz

Švábenský Brno University of Technology Department

2 CZECH PART OF THE SNĚŽNÍK NETWORK nivelační pořady body sítě Sněžník 0025TVDR (805 m) 0024KAZA (991 m) 0021SNEZ (1424 m) 0022STHR (1240 m) 0023SUSI (1323 m) Station VYHL 0026KLEP (1085 m) 0027VYHL (993 m) Approx. Position : φ = 50º λ = 16º H el = 1036 m 0030ROUD (662 m) 0031VESE (720 m) 0029LOMA (635 m) 0201DMOR (623 m) 0028MALI (734 m) 0120VLAS (446 m) 0 5 km

3 STATION VYHL

4 STATION VYHL

5 STATION VYHL CHARACTERISTICS Monumented in 1992 on solid rock outcrop Maximum observation time Central point of the Czech part of Sněžník Network GPS Instrumentation: mostly LEICA, also TRIMBLE and ASHTECH receivers Problematic: Different observation intervals, different times of day, different periods of year (especially in early campaigns)

Instrumentation: mostly LEICA, also TRIMBLE and ASHTECH receivers Problematic:

6 STATION VYHL PROCESSING AND SOLUTION AIMS Only data from BUT campaigns processed Processing with Bernese GPS Software v. 4.2 and Leica SKI-Pro v. 2.5 and 3.0 Solution constrained to weekly EUREF EPN solution coordinates of selected tie stations Different levels of ties to surrounding stations Velocity evaluation and comparisons Slope distance series evaluation

0 Solution constrained to weekly EUREF EPN solution coordinates of selected tie stations

7 STATION VYHL Coordinate Ties : GOPE 148 km WROC 109 km TUBO 106 km BOR1 238 km GRAZ 356 km WTZR 306 km

8 VYHL - OBSERVATION CAMPAIGNS YEAR DOY RECEIVERS ANTENNAS # OBS LEICA 200 LEISR299_INT 2,5 h ASHTECH Z ,134,135 LEICA 200 ASHTECH Z ,139,140 LEICA 300 GEOTRACER ,256,257 LEICA 300 ASH LEISR299_INT ASH LEISR399_INT TRM LEISR399_INT 8,2 h 7,5 h 27,0 h ,296,297 LEICA 300 LEISR399_INT 24,0 h , , ,138 LEICA 200 LEISR299_INT 64,6 h ,267,268 LEICA 200 LEISR299_INT 50,8 h ,136,137 LEICA 300 LEISR399_INT 83,0 h LEICA ,140, LEICA 300 LEISR299_INT 38,6 h LEISR399_INT

00 LEISR399_INT 8,2 h 7,5 h 27,0 h 1996 295,296,297 LEICA 300 LEISR399_INT 24,0 h 1997 125,131-132,134-135,138 LEICA 200 LEISR299_INT 64,6 h 1997

9 VYHL - OBSERVATION CAMPAIGNS YEAR DOY RECEIVERS ANTENNAS # OBS ,129, LEICA 300 LEISR399_INT 48,5 h ,127, LEICA 300 LEISR399_INT 48,7 h , , LEICA 200 LEISR299_INT 73,6 h ,135,136, LEICA SR520 LEIAT502 71,0 h TRIMBLE , LEICA SR520 TRM ,3 h LEIAT , , LEICA SR520 LEIAT502 75,8 h , LEICA SR520 LEIAT502 48,8 h

2003 134,135,136,137-138 LEICA SR520 LEIAT502 71,0 h TRIMBLE 5700 2004 132-133,136-137 LEICA SR520 TRM41249.

10 PROCESSING PARAMETERS IGS PCO/PCV antenna parameters introduced (for LEICA antennas from own calibration) IGS precise ephemerides and EOP parameters 2 ambiguity resolution strategies (QIF, Wide Lane and Narrow Lane) Troposphere parameters estimated L3 (iono-free) final solution with elevation mask ε = 13 deg Cases of combination of more short intervals AKTUÁLNÍ PROBLÉMY INŽENÝRSKÉ GEODÉZIE BRNO 2005

Lane and Narrow Lane) Troposphere parameters estimated L3 (iono-free) final solution with elevation

11 VYHL - ITRS TIME SERIES VYHL - N Time S e rie s 17,150 17,100 y = 0,0138x - 10,692 17,050 17,000 16,950 16,900 N c omp. [m] VYHL - E Time S e rie s ,550 time [ye ar] 3,500 y = 0,0198x - 36,203 3,450 3,400 3,350 E c o mp. [m] 3, time [ye ar]

[m] VYHL - E Time S e rie s 1996 1998 2000 2002 2004 2006 2008 3,550 time [ye

12 VYHL - ITRS TIME SERIES 17,1 VYHL - ITRF Time Se rie s v N = 0,0138 m v E = 0,0198 m 17,05 17 N compone nt [m] 16,95 16,9 3,300 3,350 3,400 3,450 3,500 3,550 E compone nt [m] GOPE v N = 0,0125 m v E = 0,0200 m WROC v N = 0,0132 m v E = 0,0195 m

3,300 3,350 3,400 3,450 3,500 3,550 E compone nt [m] GOPE v

13 SLOPE DISTANCE TIME SERIES VYHL-TUBO bas e line e volution 0,780 0,778 0,776 0,774 0,772 0,770 0,768 0,766 VYHL-GOPE Bas e line Evolution y = -0,0001x + 0,9909 VYHL-WROC bas e line e volution , time [ye a r] 0,784 0,782 0,780 0,778 0,776 0,774 y = 0,0006x - 0,504 0,772 0, time [ye a r] 0,402 0,400 y = -0,0006x + 1,5104 0,398 0,396 0,394 0,392 0, time [ye a r] slope distance [m] slope distance [m] slope distance [m] Bernese 4.2

0,780 0,778 0,776 0,774 y = 0,0006x - 0,504 0,772 0,770 2002 2003 2004 2005 2006 2007 time [ye a r] 0,402 0,400 y = -0,0006x + 1,5104

14 VYHL BASELINE REPEATABILITIES YEAR BASELINE REPEATABILITY BASELINE REPEATABILITY 1996 VYHL-GOPE 16,4 mm VYHL-BOR1 8,6 mm 1997 VYHL-GOPE 5,4 mm VYHL-WROC 3,2 mm 1998 VYHL-GOPE 3,8 mm VYHL-WROC 5,7 mm 1999 VYHL-GOPE 7,6 mm VYHL-WROC 6,2 mm 2000 VYHL-GOPE 2,1 mm VYHL-BOR1 1,3 mm 2001 VYHL-GOPE 5,1 mm VYHL-WROC 4,8 mm 2002 VYHL-GOPE 5,7 mm VYHL-WROC 3,0 mm 2003 VYHL-GOPE 1,7 mm VYHL-WROC 1,3 mm 2004 VYHL-GOPE 1,2 mm VYHL-WROC 2,3 mm 2005 VYHL-GOPE 2,7 mm VYHL-WROC 2,0 mm 2006 VYHL-GOPE 2,1 mm VYHL-WROC 2,8 mm

2,1 mm VYHL-BOR1 1,3 mm 2001 VYHL-GOPE 5,1 mm VYHL-WROC 4,8 mm 2002 VYHL-GOPE 5,7 mm VYHL-WROC 3,0 mm 2003 VYHL-GOPE 1,7 mm

15 SLOPE DISTANCE TIME SERIES VYHL-SCZE Bas e line Evolution 0,376 0,374 0,372 0,370 0,368 0,366 0,364 0,362 0,360 0,358 0,356 y = 0,0003x - 0, Leica SKI-Pro slope distance [m] time [ye a r] VYHL-VESE Bas e line Evolution 0,764 0,762 0,760 0,758 0,756 0,754 0,752 0,750 0,748 0,746 0,744 y = -0,0002x + 1,069 slope distance [m] time [ye a r]

distance [m] time [ye a r] VYHL-VESE Bas e line Evolution 0,764 0,762 0,760 0,758 0,756 0,754 0,752 0,750

16 HEIGHT DIFFERENCE TIME SERIES VYHL-DMOR He ight Diffe re nce Evolution -0,825-0,830-0,835-0,840-0,845-0,850-0,855-0,860 y = -4E-05x - 0, Leica SKI-Pro height difference [m] time [ye a r]

17 CONCLUSIONS Ambiguity resolution strategies QIF and Wide-Narrow Lane give practically identical results for baselines up to km No problems with troposphere parameters estimation even for short observation intervals (1,5-2 hours) For local network (like Sněžník N.) with baselines under 15 km the results obtained with Bernese GPS SW and Leica SKI-Pro are practically identical According to the results obtained there is no reason to suppose movements of station VYHL (95 % alpha) Some processing runs and analyses not yet finished, will be published lately in Acta GG

) with baselines under 15 km the results obtained with Bernese GPS SW and Leica SKI-Pro are practically identical According to the results

European Position Determination System. Guideline for EUPOS Reference Frame Fixing

European Position Determination System Guideline for EUPOS Reference Frame Fixing Version 1.0 21 September 2007 Copyright: Publisher: 2007 by the International EUPOS Steering Committee Office of the International