Post on 13-May-2023
Pre-combined GNSS-SLR solutions for the ITRF2013
D. Thaller, K. Sosnica, P. Steigenberger, O. Roggenbuck, R. Dach
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 2
Combined SINEX DORIS
Combined SINEX VLBI
Combined SINEX SLR
Combined SINEX GNSS
Inter-technique Combination DORIS + GNSS + SLR + VLBI
IGN, Paris
DGFI, München
JPL, Pasadena
Current ITRF approach
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 3
Combined SINEX DORIS
Combined SINEX VLBI
Combined SINEX SLR
Combined SINEX GNSS
Inter-technique Combination DORIS + GNSS + SLR + VLBI
IGN, Paris
DGFI, München
JPL, Pasadena
Call for ITRF2013: pre-combined solutions
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 4
Additional information needed: Offset of microwave
satellite antenna (w.r.t. Center-of-Mass)
Offset of laser retro-reflector array (w.r.t. Center-of-Mass)
Stations do not need to be co-located !
Satellite co-locations GNSS-SLR
GNSS Satellite
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 5
GNSS satellite co-locations
2002 2004 2006 2008 2010 2012 2014
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 6
GNSS satellite co-locations
2002 2004 2006 2008 2010 2012 2014
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 7
GNSS satellite co-locations
2002 2004 2006 2008 2010 2012 2014
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 8
Pre-combined GNSS-SLR solutions from CODE
IGS processing at the CODE Analysis Center
ILRS processing at the BKG Analysis Center
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 9
Pre-combined GNSS-SLR solutions from CODE
Using co-locations at GNSS satellites for connecting both techniques
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 10
Direct combination ( Indirect combination by applying correction terms )
Common parameters
GNSS microwave
SLR @ GNSS
SLR spherical satellites
Station coordinates GNSS SLR SLR ERP X X X Geocenter X X X Orbits GNSS satellites X X Microwave Sat. antenna offsets X Laser Reflector Array offsets X Range Biases X (X) Orbits spherical satellites X
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 11
Strategy for pre-combined solutions
Multi-year GNSS-SLR solution: - Range Biases - SAO - LRA offsets
Weekly combined GNSS-SLR
NEQs
Weekly combined GNSS-SLR
NEQs
Weekly combined GNSS-SLR
NEQs
Weekly combined GNSS-SLR
NEQs
Weekly combined GNSS-SLR solutions:
„standard“ values for SAO „standard“ values for LRA
Weekly combined GNSS-SLR solutions:
„standard“ values for SAO „standard“ values for LRA
Weekly combined GNSS-SLR solutions:
„standard“ values for SAO „standard“ values for LRA
Weekly combined GNSS-SLR solutions:
- „standard“ values for SAO - „standard“ values for LRA
Weekly combined GNSS-SLR solutions: - RGB from multi-year - SAO from multi-year - LRA from multi-year
Weekly combined GNSS-SLR solutions: - RGB from multi-year - SAO from multi-year - LRA from multi-year
Weekly combined GNSS-SLR solutions: - RGB from multi-year - SAO from multi-year - LRA from multi-year
Weekly combined GNSS-SLR solutions: - RGB from multi-year - SAO from multi-year - LRA from multi-year
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 12
Scale w.r.t. ITRF2008
2002 2004 2006 2008 2010 2012 2014
Mean SLR = 0.57 ppb Mean GNSS = 0.28 ppb
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 14
Laser retro-reflector array offsets
Mean GPS = -5.5 mm Mean GLONASS = -6.6 mm
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 15
Satellite co-locations provide an additional connection to strengthen inter-technique combination
More data from space-geodetic stations are included in reference frame computation
„To Do“ for our contribution to ITRF2013: • Generate best-possible multi-year solution • Verify Range Biases, SAO and LRA corrections • Generate weekly SINEX
Summary
D. Thaller et al. ׀ Pre-combined GNSS-SLR solutions ׀ 28.10.2014 ׀ Page 16
Contact: Federal Agency for Cartography and Geodesy Section G1 Richard-Strauss-Allee 11 60598 Frankfurt, Germany contact person: Daniela Thaller daniela.thaller@bkg.bund.de www.bkg.bund.de Tel. +49 (0) 69 6333-273
Thank you for your kind attention!