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Applied Optics

Applied Optics


  • Vol. 39, Iss. 3 — Jan. 20, 2000
  • pp: 376–385

Spectral diversity technique for heterodyne Doppler lidar that uses hard target returns

Philippe Drobinski, Pierre H. Flamant, and Philippe Salamitou  »View Author Affiliations

Applied Optics, Vol. 39, Issue 3, pp. 376-385 (2000)

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A two-mode CO2 laser is used as transmitter in a 10-µm heterodyne Doppler lidar (HDL) to take advantage of a spectral diversity technique, i.e., independent realizations obtained with different spectral components. The objective is to improve the properties (i.e., less variance) of power returns from a hard target. The statistical properties are presented first for a broad-spectrum laser transmitter and then for a two-mode laser transmitter. The experimental results for a cooperative diffuse hard target show that the return signals for a frequency separation Δf = 15 MHz can be decorrelated, depending on the angle of incidence and the target roughness. The experimental results show that the spectral diversity technique improves the performance of the HDL.

© 2000 Optical Society of America

OCIS Codes
(010.3640) Atmospheric and oceanic optics : Lidar
(030.6140) Coherence and statistical optics : Speckle
(040.2840) Detectors : Heterodyne
(280.1910) Remote sensing and sensors : DIAL, differential absorption lidar
(290.5880) Scattering : Scattering, rough surfaces

Original Manuscript: May 14, 1999
Revised Manuscript: September 28, 1999
Published: January 20, 2000

Philippe Drobinski, Pierre H. Flamant, and Philippe Salamitou, "Spectral diversity technique for heterodyne Doppler lidar that uses hard target returns," Appl. Opt. 39, 376-385 (2000)

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