Laser radar spectrum of a rotating random rough surface

Philip Gatt; Thomas P. Costello; Chie L. Vogt; C. Martin Stickley

doi:10.1117/12.157102

15 October 1993 Laser radar spectrum of a rotating random rough surface

Philip Gatt, Thomas P. Costello, Chie L. Vogt, C. Martin Stickley

Proceedings Volume 1936, Applied Laser Radar Technology; (1993) https://doi.org/10.1117/12.157102
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

A theoretical model is presented for the mutual coherence function that describes the power spectrum of the intermediate frequency (IF) signal resulting from coherent laser radar detection of a fully illuminated rough rotating cylinder. Preliminary calculations for the correlation length and bandwidths of the coherently detected dynamic speckle fields show that Doppler effects on speckle dynamics are on the same order of magnitude as speckle translation effects, and that scatterer exchange effects are negligible. We show that for a fully diffuse object, the shape of the spectrum (and autocorrelation function) is Gaussian. The spectrum appears to be the sum of two Gaussian functions when the scattering object has a near-specular component, one due to the specularly reflected field and the other due to the diffusely reflected field. While the IF BW of the signal resulting from the diffusely scattered field depends upon the cylinder's radius, the IF BW of the specularly reflected field depends upon the width of a window function, which is wavelength dependent.

Citation Download Citation

Philip Gatt, Thomas P. Costello, Chie L. Vogt, and C. Martin Stickley "Laser radar spectrum of a rotating random rough surface", Proc. SPIE 1936, Applied Laser Radar Technology, (15 October 1993); https://doi.org/10.1117/12.157102

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