In-Flight Calibration of the Wind Imaging Interferometer (WINDII) on Board the Upper Atmosphere Research Satellite.
1998
The Wind Imaging Interferometer (WINDII) was launched on the Upper Atmosphere
Research Satellite to measure the Earth’s upper-atmospheric wind and
temperature. It is a remote-sensing instrument that employs a field-compensated
Michelson interferometer to measure the Doppler shift, line width, and emission
rate of naturally occurring airglow emission lines. The data analysis uses
calibration data that were obtained in the laboratory prior to launch. A
calibration package to monitor instrument parameters was built and placed in the
instrument. This package consists of a He–Ne laser, spectral lamps, and
a tungsten lamp. These sources and their performance during six years of
operation in orbit are described. It is shown that the WINDII principle of wind
measurement can be assessed fully by the use of in-flight calibration data and
that the preflight and in-flight phase calibrations can be related to each other
with a precision of the order of 1 ms-1.
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