David G. Voelz

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It is known that partially (spatial) coherent beams can reduce the effects of scintillation in a free space optical link. However, practical implementations of this type of beam are still under investigation. In this work we apply a wave optics model to analyze the propagation through turbulence of a coherent beam and a particular version of a(More)
A passive-polarization-based imaging system records the polarization state of light reflected by objects that are illuminated with an unpolarized and generally uncontrolled source. Such systems can be useful in many remote sensing applications including target detection, object segmentation, and material classification. We present a method to jointly(More)
Passive imaging polarimetry has emerged as an useful tool in many remote sensing applications including material classification , target detection and shape extraction. In this paper we present a method to classify specular objects based on their material composition from passive polarimetric imagery. The proposed algorithm is built on an iterative(More)
— Optimal placement of sensors or landmarks for the localization of an autonomous guided vehicle (AGV) based on range measurements is considered. The optimization relies on the Fisher information matrix (FIM). A closed-form expression of the FIM determinant is obtained for two dimensional (2D) and three dimensional (3D) spaces considering heterogeneous(More)
—Atmospheric turbulence causes severe performance degradation in free space optical communication links. However, by using a reliable low bandwidth wireline or radio frequency link in parallel, the performance of such links can be improved significantly. This is achieved by using error correction codes at the transmitter, and decoding the received data(More)
One of the major problems associated with LIDAR sensing is that significant amounts of data must be collected to obtain detailed topographical information about a region. Current efforts to solve this problem have focused on designing compression algorithms which operate on the collected data. Typical compression algorithms, however, require the collection(More)
The performance of an imaging technique relying on the spatial correlation of laser-speckle intensity measurements is evaluated on the basis of theoretical analysis, computer simulation, and laboratory results. A theoretical expression for the signal-to-noise ratio of the recovered imaging target's power spectrum is used to estimate the imaging performance(More)
Polarization, a property of light that conveys information about the transverse electric field orientation, complements other attributes of electromagnetic radiation such as intensity and frequency. Using multiple passive polarimetric images, we develop an iterative, model-based approach to estimate the complex index of refraction and apply it to target(More)
iii ACKNOWLEDGEMENTS I would like to thank my advisor Dr. Paul Furth for his guidance and advice throughout my master's. He has always been there as a friend, philosopher and guide and has mentored me and helped me at all times of need. His work ethics and professionalism is admired by one and all. I thank his family for their love and affection, for making(More)