Cylindrical target Doppler and Doppler-spread feature estimation using coherant mode-locked pulse laser radars with long observation times

Douglas G. Youmans

doi:10.1117/12.440115

19 September 2001 Cylindrical target Doppler and Doppler-spread feature estimation using coherant mode-locked pulse laser radars with long observation times

Douglas G. Youmans

Author Affiliations +

Proceedings Volume 4377, Laser Radar Technology and Applications VI; (2001) https://doi.org/10.1117/12.440115
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

Mode-locked solid-state coherent laser radars operating continuously and at short wavelengths are capable of forming range-resolved Doppler and intensity images of distant spinning objects. The continuous mode-locked repetitive pulse operation allows demonstrated long laser coherence- lengths to achieve efficient heterodyne detection. The continuous repetitive pulsed operation also allows one to probe an object for arbitrarily long observation times resulting in precise center-of-mass-Doppler estimation and micro-Doppler vibration and spin measurements, as well as the temporal integration of the received signals to increase effective signal strength. We investigate this ladar waveform for imaging spinning cylinders at large distances, so that there is on the order of two detected photons approximately every 1,000 micro-pulses and applying simple estimators to the Doppler center-of-mass and Doppler-width for automatic target recognition purposes. A simple preliminary model for 'reflective' cylinders is also presented.

Citation Download Citation

Douglas G. Youmans "Cylindrical target Doppler and Doppler-spread feature estimation using coherant mode-locked pulse laser radars with long observation times", Proc. SPIE 4377, Laser Radar Technology and Applications VI, (19 September 2001); https://doi.org/10.1117/12.440115

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KEYWORDS

Doppler effect

Speckle

Mode locking

LIDAR

Digital filtering

Monte Carlo methods

Signal to noise ratio

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