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Optical Engineering

Coherent versus incoherent ladar detection at 2.09 μm [also Erratum 33(9)3118(Sep1994)]
Author(s): Jay Alan Overbeck; Martin B. Mark; Scott H. McCracken; Paul F. McManamon; Bradley D. Duncan
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Paper Abstract

A 2.09-μm ladar system is built to compare coherent to incoherent detection. The 2.09-μm wavelength is of interest because of its high atmospheric transmission and because it is eyesafe. The 2.09-μm system presented is capable of either a coherent or incoherent operational mode, is tunable in a small region around 2.09 μm, and is being used to look at the statistical nature of the ladar return pulses for typical glint and speckle targets. To compare coherent to incoherent detection the probability of detection is investigated as the primary performance criterion of interest. The probability of detection is dependent on both the probability of false alarm and the probability density function, representing the signal current output from the detector. These probability distributions are different for each detection technique and for each type of target. Furthermore, the probability of detection and the probability of false alarm are both functions of the dominating noise source(s) in the system. A description of the theoretical expectations of this system along with the setup of the ladar system and how it is being used to collect data for both coherent and incoherent detection is presented.

Paper Details

Date Published: 1 November 1993
PDF: 9 pages
Opt. Eng. 32(11) doi: 10.1117/12.148109
Published in: Optical Engineering Volume 32, Issue 11
Show Author Affiliations
Jay Alan Overbeck, Rose-Hulman Institute of Technology (United States)
Martin B. Mark, U.S. Air Force Academy (United States)
Scott H. McCracken, U.S. Air Force (United States)
Paul F. McManamon, U.S. Air Force (United States)
Bradley D. Duncan, Univ. of Dayton (United States)

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