Coherent lidar imaging of dust clouds: waveform comparison with the poly-phase (P4) modulation waveform

Douglas G. Youmans

doi:10.1117/12.778099

16 April 2008 Coherent lidar imaging of dust clouds: waveform comparison with the poly-phase (P4) modulation waveform

Douglas G. Youmans

Proceedings Volume 6950, Laser Radar Technology and Applications XIII; 695009 (2008) https://doi.org/10.1117/12.778099
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

A dust or aerosol cloud represents a convenient target to examine the capabilities of range-resolved Doppler and intensity (RRDI) or inverse synthetic aperture ladar (ISAR) imaging coherent laser radar, known as coherent "lidar" for optically thin targets. The poly-phase P4 ladar waveform and its RRDI images are described and compared with previous pulse-burst, linear-FM chirp pulse-compression, pseudo-random phase modulation waveforms, and several other waveforms which have not been utilized to date. A "dust cloud" has very many independently moving point scatterers with velocities that are approximately Gaussian randomly distributed in x,y,z with standard deviations of about 10% of the mean wind + aerosol velocity. This is contrary to a hard-target where the point scatterers are rigidly attached and moving together. The dust cloud produced speckle effects for the various ladar waveforms are compared. In addition, a reference set of four corner-cube retro-reflectors within the dust cloud further illustrates the differences in the various waveform capabilities and resolution.

Citation Download Citation

Douglas G. Youmans "Coherent lidar imaging of dust clouds: waveform comparison with the poly-phase (P4) modulation waveform", Proc. SPIE 6950, Laser Radar Technology and Applications XIII, 695009 (16 April 2008); https://doi.org/10.1117/12.778099

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