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Proceedings Paper

FMCW lidar for multiple-target sounding
Author(s): Oscar Batet; Federico Dios; Adolfo Comeron
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Paper Abstract

Continuous-Wave lidars are constantly evolving in order to achieve the best performances with low power and low cost. Frequency-modulated continuous-wave (FMCW) lidar is a well-known type of lidar used for solid-target detection and ranging with high spatial resolution. The extension of this lidar technique to the probing of distributed media (aerosols, smoke or exhaust fumes) has recently been proposed by the authors. The main drawback in measuring extended or distributed targets with a conventional FMCW signal is the loss of information that occurs in the retrieved signal, as it suffers a bandpass filtering in the detection process. This implies the practical impossibility of recovering the complete information about the target spatial distribution. A shift of the sub-carrier FM modulating signal to baseband can avoid these effects and the desired information can be satisfactorily retrieved if the emitted signal is adequately chosen to avoid sum-frequency components distortion. A theoretical formulation has been developed and tested by sounding a distributed medium composed of two narrow solid targets, which is analyzed in different configurations by changing the distance among them. The medium is probed with both the classical sub-carrier FM bandpass signal and with the baseband one previously proposed. The experimental results are compared with the corresponding simulations in order to assess them.

Paper Details

Date Published: 26 August 2010
PDF: 11 pages
Proc. SPIE 7813, Remote Sensing System Engineering III, 78130H (26 August 2010); doi: 10.1117/12.860382
Show Author Affiliations
Oscar Batet, Univ. Politècnica de Catalunya (Spain)
Federico Dios, Univ. Politècnica de Catalunya (Spain)
Adolfo Comeron, Univ. Politècnica de Catalunya (Spain)

Published in SPIE Proceedings Vol. 7813:
Remote Sensing System Engineering III
Philip E. Ardanuy; Jeffery J. Puschell, Editor(s)

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