Doppler Asymmetric Spatial Heterodyne (DASH) Light Detection and Ranging (LIDAR) Receiver
Christoph R. Englert, John M. Harlander and David E. Siskind
Affiliation: Naval Research Laboratory, Space Science Division, Code 7630, 4555 Overlook Ave SW, Washington, DC, USA.
The Doppler Asymmetric Spatial Heterodyne (DASH) spectrometer concept was first proposed in 2006 for
measuring Doppler shifts of single or multiple, near monochromatic signals and specifically for the passive measurement
of atmospheric winds in planetary atmospheres. DASH interferometers have since been proposed, built and used for the
passive remote sensing of Doppler shifts of naturally occurring, telluric airglow lines to infer thermospheric winds. In
particular, ground based measurements have been conducted and a space based DASH instrument payload for measuring
thermospheric winds from low earth orbit is currently part of a NASA Explorer mission Phase A study. Up to now, DASH
interferometers have only been implemented and proposed for instruments that perform passive detection of naturally
occurring thermospheric airglow. Using DASH interferometers within the active detection system of a Doppler wind
Light Detection and Ranging (LIDAR) system was recently patented in the United States of America. This paper briefly
explains this concept and its potential advantages.
Keywords: Lidar, spatial heterodyne spectroscopy, active remote sensing.Lidar, spatial heterodyne spectroscopy, active remote sensing.Lidar, spatial heterodyne spectroscopy, active remote sensing.
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