NSSDCA ID: 1991-063B-02
Mission Name: UARSThe objective of the High Resolution Doppler Imager (HRDI) on UARS was to use a high-resolution, triple-eatlon, Doppler-imaging, Fabry-Perot interferometer to detect sharp features in the spectrum of light emitted or scattered from the earth's atmosphere, and to obtain the vector wind field directly to an accuracy of better than 5 m/s. The information obtained was used to study a series of problems associated with the dynamics of the atmosphere and the transport of minor constituents within the atmosphere. The HRDI interferometer consists of a single sensor containing two 8-position spectral filters and the main objective telescope. The telescope was 2-axis gimbaled to view the horizon at two orthogonal directions, and scanned in the zenith direction for altitude coverage. The triple-etalon Fabry-Perot design provided white light rejection and high throughput, allowing measurement of absorption features. The low- and medium-resolution etalons used pizeoelectric spacers for tuning the gap between the etalons. The etalons were 132 mm in diameter with a 90 mm FOV. The interferometer used a modified Questar telescope to focus interference patterns received from the etalon onto the image plane detector. The instrument also included a dedicated instrument processor which controls instrument functions, including telescope positioning, filter selection, and etalon control. See Reber, Carl A., "The Upper Atmosphere Research Satellite", Trans. Am. Geophys. Union EOS, Vol. 71, No.51, December 18, 1990.
Mass: 167 kg
Power (avg): 82 W
Bit rate (avg): 4.75 kbps
Questions and comments about this experiment can be directed to: Dr. Dieter K. Bilitza
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. David Rees | Other Investigator | University College, London | |
Dr. Raymond G. Roble | Other Investigator | National Center for Atmospheric Research | roble@ncar.ucar.edu |
Prof. Gonzalo J. Hernandez | Other Investigator | NOAA Environmental Research Laboratories | gonzalo@geophys.washington.eduhernandez@u.washington.edu |
Prof. Paul B. Hays | Principal Investigator | University of Michigan | hays@sprlj.sprl.umich.edu |