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A corrective model for Jason-1 DORIS Doppler data in relation to the South Atlantic Anomaly

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Abstract

The DORIS Doppler measurements collected by Jason-1 are abnormally perturbed by the influence of the South Atlantic Anomaly (SAA). The DORIS ultra-stable oscillators on-board Jason-1 are not as stable as they should be; their frequency is sensitive both to the irradiation rate and to the total irradiation encountered in orbit. The consequence is that not only are the DORIS measurement residuals higher than they ought to be, but also large systematic positioning errors are introduced for stations located in the vicinity of the SAA. In this paper, we present a method that has been devised to obtain a continuous observation of Jason-1 frequency offsets. This method relies on the precise determination of the station frequency and troposphere parameters via the use of other DORIS satellites. More than 3 years of these observations have then been used to construct a model of response of the oscillators of Jason-1 to the SAA. The sensitivity of the Jason-1 oscillators to the SAA perturbations has evolved over time, multiplied by a factor of four between launch and mid-2004. The corrective performances of the model are discussed in terms of DORIS measurement residuals, precise orbit determination and station positioning. The average DORIS measurement residuals are decreased by more than 7 % using this model. In terms of precise orbit determination, the 3D DORIS-only orbit error decreases from 5 to 4.2 cm, but the DORIS+SLR orbit error is almost unaffected, due to the already good quality of this type of orbit. In terms of station positioning, the model brings down the average 3D mono-satellite monthly network solution discrepancy with the International Terrestrial Reference Frame ITRF2000 from 11.3 to 6.1 cm, and also decreases the scatter about that average from 11.3 to 3.7 cm. The conclusion is that, with this model, it is possible to re-incorporate Jason-1 in the multi-satellite geodetic solutions for the DORIS station network.

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Authors and Affiliations

  1. CNES (Centre National d’Etudes Spatiales), 18, avenue Edouard Belin, 31401, Toulouse cedex 4, France

    J.-M. Lemoine

  2. CLS (Collecte Localisation Satellites), 8–10, rue Hermès, Parc Technologique du Canal, 31520, Ramonville-Saint-Agne, France

    H. Capdeville

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  1. J.-M. Lemoine
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  2. H. Capdeville
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Correspondence to J.-M. Lemoine.

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Lemoine, JM., Capdeville, H. A corrective model for Jason-1 DORIS Doppler data in relation to the South Atlantic Anomaly. J Geodesy 80, 507–523 (2006). https://doi.org/10.1007/s00190-006-0068-2

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  • DOI: https://doi.org/10.1007/s00190-006-0068-2

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