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Proceedings Paper • Open Access

A demonstrator for an incoherent Doppler wind lidar receiver
Author(s): F. Fabre; A. Marini; Thomas C. Sidler; Didier Morancais; G. Fongy; Ph. Vidal

Paper Abstract

The knowledge of wind fields for a global terrestrial coverage and accurate altitude sampling is one of the main keys for improvement of meteorological predictions and general understanding of atmosphere behaviour. The best way to recover this information is remote sensing from space using low Earth orbit satellites. The measurement principle is to analyse the Doppler shift of the flux emitted by the space instrument and backscattered by the atmosphere. One of the most promising principle for Doppler shift measurement is the direct detection which does not need local oscillators. what significantly simplifies the design of such a space-borne receiver. ESA-ESTEC initiated at early 95' a programme called "lncoherent Doppler Wind Lidar (IDWL) technologies" for the study and bread-boarding phase. MMS won this contract proposing an original concept based on the use of a Fizeau high resolution interferometer working in the UV band. coupled with an intensified CCD. This concept is patented by MMS, as well as the special CCD timing sequence that will be depicted below. The programme begun by a study of the space-borne instrument in order to identify main constraints and define the receiver as could be for a flight model. A detailed performance model was established and parametric analysis allowed to optimise the concept in order to reach required performances. This study phase finally provided the definition of a bread-board for expected performances demonstration. Moreover, the Laser Signal Simulator (LSS) which is used to simulate the Lidar echo in term of amplitude as well as frequency modulation was defined at this step. The performances of this test support equipment are of main importance for the validation of the demonstrator design and performances. The second part of the study aimed at defining the derailed design of the demonstrator and associated test support equipment as well as initiating preliminary validation experiments on most critical technologies, like Fizeau interferometer which needs particularly high thermal stability and spectral resolution. At the end of this design phase. the test bench equipment begun to be manufactured and equipment test results preliminary assessed the study phase results. After integration, the correct operation and control of the overall test bench were assessed and performance tests were undertaken . The final conclusion of this programme aimed at up­dating the performance simulation software in order to refine expected performances for the future flight instrument.

Paper Details

Date Published: 2 April 2018
PDF: 11 pages
Proc. SPIE 10570, International Conference on Space Optics — ICSO 1997, 1057005 (2 April 2018); doi: 10.1117/12.2326433
Show Author Affiliations
F. Fabre, Matra-Marconi-Space (France)
A. Marini, European Space Research and Technology Ctr. (Netherlands)
Thomas C. Sidler, EPFL (Switzerland)
Didier Morancais, Matra-Marconi-Space (France)
G. Fongy, Matra-Marconi-Space (France)
Ph. Vidal, Matra-Marconi-Space (France)

Published in SPIE Proceedings Vol. 10570:
International Conference on Space Optics — ICSO 1997
Georges Otrio, Editor(s)

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