Comparison DUT and UT/CSR Orbits for ERS-1


Global distribution of trends and cyclic behaviour

The next five plots show the values of the four parameters (mean, secular trend, in-phase and quadrature annual cycle) fitted in each local time series of orbital altitude differences between the DUT and UT/CSR orbit solution. The fifth plot shows the remaining variance.
Mean (mean = 0.184 cm, rms = 2.683 cm)

Secular trend (mean = -0.043 cm/year, rms = 1.286 cm/year)

Annual amplitude (in-phase) (mean = 0.041 cm, rms = 1.171 cm)

Annual amplitude (quadrature) (mean = 0.015 cm, rms = 1.057 cm)

Residual (rms = 2.318 cm)

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More analyses on ERS-1 orbit stability

Questions or comments:
Remko Scharroo, remko.scharroo@lr.tudelft.nl.
22 January 1997.