Measured Turbulence And Speckle Effects In Laser Radar Target Returns

David M. Papurt; Jeffrey H. Shapiro; Sun T. Lau

doi:10.1117/12.935910

13 December 1983 Measured Turbulence And Speckle Effects In Laser Radar Target Returns

David M. Papurt, Jeffrey H. Shapiro, Sun T. Lau

Proceedings Volume 0415, Coherent Infrared Radar Systems and Applications II; (1983) https://doi.org/10.1117/12.935910
Event: 1983 Technical Symposium East, 1983, Arlington, United States

Abstract

Previous studies have established a mathematical system model for a compact coherent laser radar which incorporates the statistical effects of target speckle and glint, local oscillator shot noise, and propagation through atmospheric turbulence. This paper reports results from a measurement program at the MIT Lincoln Laboratory aimed at verifying the foregoing model. Simultaneous laser radar returns and scintillation sensor measurements were collected over a one kilometer path in various turbulence conditions, with the radar observing either a glint object (retro-reflector) or a speckle object (flame-sprayed aluminum calibration plate). Three modes of laser radar operation were employed: full field-of-view scanning, reduced field-of-view scanning, and staring. The principal conclusions drawn from analyzing these data are as follows. First, beam jitter must be included in the system model. Second, the jitter-corrected retro-reflector returns do show turbulence induced lognormal scintillation. Third, turbulence-induced beam jitter is the cause for staring-mode speckle target decorrelation.

Citation Download Citation

David M. Papurt, Jeffrey H. Shapiro, and Sun T. Lau "Measured Turbulence And Speckle Effects In Laser Radar Target Returns", Proc. SPIE 0415, Coherent Infrared Radar Systems and Applications II, (13 December 1983); https://doi.org/10.1117/12.935910

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