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

This document presents the results of validation activities for Jason-1 and TOPEX/Poseidon precise orbits as discussed during the OSTST Meeting in Hobart, March 2007. Significant findings include the reduction of the ALT-B bias of TOPEX/Poseidon and its impact on different ITRF versions (2000 and 2005). The new ALT-B bias series based on TVG orbits reveals notable drift compared to previous data. The POSEIDON-2 biases showed minimal changes with a consistent drift identified in the time series. GPS Reduced Dynamic orbits from JPL have also been considered.

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

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  1. 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

  2. IMPACT OF ORBIT TOPEX/Poseidon ALT-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-1 POSEIDON-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… OSTST Meeting, Hobart, March 2007

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