Space-time analysis of TIMED Doppler Interferometer (TIDI) measurements

S. M.I. Azeem, T. L. Killeen, R. M. Johnson, Q. Wu, D. A. Gell

Research output: Contribution to journalArticlepeer-review


A technique is developed for reducing the amount of aliasing in the spectral analysis of TIDI observations, by ingestion of ground-based data into the satellite data set. A multi-dimensional (space-time) least squares fitting approach is applied to the satellite and ground-based data to determine the aliasing spectra. The addition of ground-based data to the TIDI data set reduces the aliased components in the aliasing spectrum. For example, at 20° latitude, the combined ground-based and TIDI data set of a sampled input semidiurnal (frequency of 2 days-1) signal with zonal wavenumber 2 results in a factor of 2 reduction in the amount of power aliasing into a signal with zonal wavenumber 0 and frequency 0 days-1.

Original languageEnglish (US)
Pages (from-to)3297-3300
Number of pages4
JournalGeophysical Research Letters
Issue number20
StatePublished - Oct 15 2000
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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