Precision orbit determination for TOPEX/POSEIDON

Tapley, B. D.; Ries, John; Davis, George W.; Eanes, R. J.; Schutz, B. E.; Shum, C. K.; Watkins, M. M.; Marshall, Jill; Nerem, R. S.; Putney, B. H.; Klosko, S. M.; Luthcke, S. B.; Pavlis, D. E.; Williamson, Robert C.; Zelensky, N. P.

doi:10.1029/94jc01645

Cited by 241 publications

(76 citation statements)

References 52 publications

(21 reference statements)

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“…However, MGDRs are essentially IGDRs except that (1) the orbit is replaced with a precise orbit ephemeris (POE), (2) the IGDR SSB model (a 1-parameter model) has been replaced with the model in equation (1) and coefficients estimated by Gaspar et al [1994], and (3) a correction determined from the internal calibration mode has been applied to the range [Hayne et al, 1994]. The most difficult of these differences to obtain is the POE, but this is routinely computed at the University of Texas Center for Space Research (UTCSR) as part of the TOPEX verification [Tapley et al, 1994]. Therefore we routinely update the TOPEX IGDR data with the MGDR SSB model, the internal calibration correction, and the UTCSR POEs.…”

Section: Data Processingmentioning

confidence: 99%

New TOPEX sea state bias models and their effect on global mean sea level

et al. 2003

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[1] During the calibration of the Jason-1 altimeter, it was discovered that the Jason-TOPEX sea surface height (SSH) residuals contained a trend correlated with significant wave height (SWH), indicating an error in the sea state bias (SSB) model for one or both of the altimeters. After updating the SSB model for Jason the trend remained, which pointed to an error in the TOPEX model. Since two different TOPEX altimeters (TOPEX_A and TOPEX_B) have operated during the mission, we estimated new SSB models using data from each one. The estimated SSB model for TOPEX_B is significantly different than the model provided with the data, which was estimated using only TOPEX_A data. Replacing the SSB model on TOPEX with the new TOPEX_A and TOPEX_B models not only removes the correlation with SWH in the Jason-TOPEX SSH residuals, it also removes most of a bias between TOPEX_A and TOPEX_B that has been observed in tide gauge calibrations. The magnitude of the change between TOPEX_A SSH and TOPEX_B SSH is of the order of 10 mm globally, with TOPEX_B SSH increasing when the new SSB model is applied. The application of this improved model will increase the rate of observed global mean sea level rise from 1.7 mm/year when the original TOPEX data are used to 2.8 mm/year when the updated SSB models are applied.

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Section: Data Processingmentioning

confidence: 99%

New TOPEX sea state bias models and their effect on global mean sea level

et al. 2003

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“…terrestrial reference frame [Precision Orbit Determination (POD), 1994; Marshall et al, 1995], while the others employed data with orbits using the older JGM-2 gravity field model [Tapley et al, 1994]. In principle, tide models computed from the JGM-3 orbit (gravity field, dynamical tide model, and other improvements) are to be preferred, because the estimated radial accuracy of the orbits of 2-3 cm represents a significant improvement over the 3-4 cm for JGM-2.…”

Section: Kort-og Matrikelstyrelsen Geodetic Division Copenhagen Dmentioning

confidence: 99%

Accuracy assessment of recent ocean tide models

Shum¹,

Woodworth²,

Andersen³

et al. 1997

J. Geophys. Res.

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279

163

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Abstract. Over 20 global ocean tide models have been developed since 1994, primarily as a consequence of analysis of the precise altimetric measurements from TOPEX/POSEIDON and as a result of parallel developments in numerical tidal modeling and data assimilation. This paper provides an accuracy assessment of 10 such tide models and discusses their benefits in many fields including geodesy, oceanography, and geophysics. A variety of tests indicate that all these tide models agree within 2-3 cm in the deep ocean, and they represent a significant improvement over the classical Schwiderski 1980 model by approximately 5 cm rms. As a result, two tide models were selected for the reprocessing of TOPEX/POSEIDON Geophysical Data Records in late 1995. Current ocean tide models allow an improved observation of deep ocean surface dynamic topography using satellite altimetry. Other significant contributions include theft applications in an improved orbit computation for TOPEX/POSEIDON and other geodetic satellites, to yield accurate predictions of Earth rotation excitations and improved estimates of ocean loading corrections for geodetic observatories, and to allow better separation of astronomical tides from phenomena with meteorological and geophysical origins. The largest differences between these tide models occur in shallow waters, indicating that the current models are still problematic in these areas. Future improvement of global tide models is anticipated with additional high-quality altimeter data and with advances in numerical techniques to assimilate data into high-resolution hydrodynamic models.

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“…Traditional ground-based tracking methods that use range and range-rate measurements can provide an orbit accuracy as good as a few centimeters 1 . Autonomous orbit determination using only onboard measurements can be a requirement of military satellites in order to guarantee independence from ground facilities 2 .…”

Section: Introductionmentioning

confidence: 99%

Tests of Magnetometer/Sun-Sensor Orbit Determination Using Flight Data

Jung

Psiaki

2002

Journal of Guidance, Control, and Dynamics

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A magnetometer-based orbit determination batch filter has been improved and tested with real flight data from Dynamics Explorer 2 (DE-2), the Magnetic Field Satellite (MAGSAT), and the Ørsted satellite. These tests have been conducted in order to determine the performance of a low-cost autonomous orbit determination system. The spacecraft's orbit, magnetometer biases, and correction terms to the Earth's magnetic field are estimated by this filter. Synthesized sunsensor data in addition to real magnetometer data is used in order to make the field model

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Precision orbit determination for TOPEX/POSEIDON

Cited by 241 publications

References 52 publications

New TOPEX sea state bias models and their effect on global mean sea level

New TOPEX sea state bias models and their effect on global mean sea level

Accuracy assessment of recent ocean tide models

Tests of Magnetometer/Sun-Sensor Orbit Determination Using Flight Data

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