FMCW lidar for multiple-target sounding

Oscar Batet; Federico Dios; Adolfo Comeron

doi:10.1117/12.860382

26 August 2010 FMCW lidar for multiple-target sounding

Oscar Batet, Federico Dios, Adolfo Comeron

Proceedings Volume 7813, Remote Sensing System Engineering III; 78130H (2010) https://doi.org/10.1117/12.860382
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

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.

Citation Download Citation

Oscar Batet, Federico Dios, and Adolfo Comeron "FMCW lidar for multiple-target sounding", Proc. SPIE 7813, Remote Sensing System Engineering III, 78130H (26 August 2010); https://doi.org/10.1117/12.860382

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KEYWORDS

Signal detection

Modulation

LIDAR

Target detection

Frequency modulation

Signal processing

Fermium

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