Validation Activities for Jason-1 and TOPEX/Poseidon Precise Orbits

P. Bonnefond(1), P. Exertier(1), O. Laurain(1), P. Berio(1), D. Coulot(2)

(1)OCA/GEMINI, Grasse(2)IGN, Marne la vallée

OSTST Meeting, Hobart, March 2007

OSTST Meeting, Hobart, March 2007 2

Precise Orbits ValidationsFor T/P and Jason-1

IMPACT OF ORBIT

TOPEX/PoseidonALT-B bias (at epoch 2002.0) is decreased by 11.3 and 8.1mm for TVG ITRF2000 and TVG ITRF2005-rescaled respectively. The new ALT-B bias time series based on TVG orbits exhibit a drift relatively to the one based on the GDR orbit of -1.7mm/yr and -1.2mm/yr for TVG ITRF2000 and TVG ITRF2005-rescaled respectively.

Jason-1POSEIDON-2 bias (at epoch 2002.0) is not significantly changed for both TVG ITRF2000 and TVG ITRF2005-rescaled . The new POSEIDON-2 bias time series based on TVG orbits exhibit a drift relatively to the one based on the CNES GDR-B orbit of -1.4mm/yr and -0.8mm/yr for TVG ITRF2000 and TVG ITRF2005-rescaled respectively. GPS Reduced Dynamic orbits from JPL have been recently released (07a version, not shown on the Figure). As for TVG orbits POSEIDON-2 bias at epoch 2002.0 is not significantly changed but the time series exhibits an opposite drift of +0.9mm/yr relatively to the one based on the CNES GDR-B orbit.

And what about the LRA correction…