Comparison DUT and UT/CSR Orbits for ERS-1

Regional 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 = -0.039 cm, rms = 2.459 cm)

Secular trend (mean = 0.008 cm/year, rms = 1.487 cm/year)

Annual amplitude (in-phase) (mean = -0.423 cm, rms = 1.290 cm)

Annual amplitude (quadrature) (mean = -0.569 cm, rms = 1.230 cm)

Residual (rms = 2.556 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.