Dr. Gregg A. Crockett Profile

Dr. Gregg A. Crockett

at Tau Technologies LLC

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Author

Publications (9)

Proceedings Article | 29 August 2022 Presentation + Paper

The Magdalena Ridge Observatory Interferometer: upcoming important milestones towards first fringes

M. Creech-Eakman, V. Romero, C. Haniff, D. Buscher, J. Young, C. Salcido, G. Chavez, R. Collins, W. Cook, C. Gino, J. Giron, A. Farris, R. Norris, J. Pino, E. Seneta, X. Sun, J. J. Luis, D. Mortimer, I. Ahmed, D. Frothingham, J. Mason, H. Momeni, D. Neal, S. Norouzi, G. Owens, J. Verner, V. Gamiz, G. Crockett

Proceedings Volume 12183, 1218305 (2022) https://doi.org/10.1117/12.2630694

KEYWORDS: Telescopes, Interferometers, Software development, Magdalena Ridge Observatory, Infrared telescopes, Electronics, Optical tracking, Long baseline optical interferometry, Infrared imaging

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Proceedings Article | 20 June 2003 Paper

Validation and verification of the laser range safety tool (LRST)

Paul Kennedy, Kenneth Keppler, Robert Thomas, Garrett Polhamus, Peter Smith, Javier Trevino, Daniel Seaman, Robert Gallaway, Gregg Crockett

Proceedings Volume 4953, (2003) https://doi.org/10.1117/12.476899

KEYWORDS: Laser safety, Safety, Reflectivity, Bidirectional reflectance transmission function, Data modeling, Hazard analysis, Physics, Databases, Laser energy, Systems modeling

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Proceedings Article | 25 June 2002 Paper

Visualization tool for advanced laser system development

Gregg Crockett, Richard Brunson

Proceedings Volume 4724, (2002) https://doi.org/10.1117/12.472363

KEYWORDS: Satellites, Visualization, Solid modeling, 3D modeling, Computer aided design, Relays, Laser development, Laser systems engineering, 3D acquisition, Optical simulations

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Proceedings Article | 9 January 2002 Paper

Satellite discrimination from active and passive polarization signatures: simulation predictions using the TASAT satellite model

Keith Bush, Gregg Crockett, Calvin Barnard

Proceedings Volume 4481, (2002) https://doi.org/10.1117/12.452906

KEYWORDS: Satellites, Polarization, Mueller matrices, Infrared signatures, Electro optical modeling, Scattering, Light scattering, 3D modeling, Visible radiation, Satellite imaging

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Proceedings Article | 21 August 2001 Paper

Simulation of an advanced small aperture track system

Tommy Williams, Gregg Crockett, Richard Brunson, Brad Beatty, Daniel Zahirniak, Bernard Deuto

Proceedings Volume 4365, (2001) https://doi.org/10.1117/12.438049

KEYWORDS: Satellites, Control systems, Fiber optic illuminators, Sensors, MATLAB, Simulink, Acquisition tracking and pointing, Atmospheric optics, Optical simulations, Electro optical modeling

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Proceedings Article | 3 October 1997 Paper

Polarization rendering for modeling of coherent polarized speckle backscatter using TASAT

Keith Bush, Gregg Crockett, Calvin Barnard, David Voelz, James Riker

Proceedings Volume 3121, (1997) https://doi.org/10.1117/12.283854

KEYWORDS: Polarization, Speckle, Satellites, Electro optical modeling, Backscatter, Polarimetry, Receivers, Optical spheres, Bidirectional reflectance transmission function, Atmospheric modeling

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Proceedings Article | 5 July 1994 Paper

Satellite Imaging Experiment tracking simulation results

James Riker, Jon Roark, David Mikolajczak, Stephen Stogsdill, Richard Walter, Richard Brunson, Gregg Crockett

Proceedings Volume 2221, (1994) https://doi.org/10.1117/12.178936

KEYWORDS: Stars, Atmospheric optics, Satellites, Satellite imaging, Sensors, Atmospheric modeling, Atmospheric sensing, Optical tracking, Adaptive optics, Calibration

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Proceedings Article | 25 November 1992 Paper

Precision trackpoint control via correlation track referenced to simulated imagery

Richard Brunson, Dennis Boesen, Gregg Crockett, James Riker

Proceedings Volume 1697, (1992) https://doi.org/10.1117/12.138185

KEYWORDS: Signal to noise ratio, Satellites, Satellite imaging, Optical tracking, Process modeling, Earth observing sensors, Computer simulations, Image processing, Atmospheric optics, Image registration

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A number of tracking and pointing applications require extremely precise referencing of the optical line of sight (LOS) relative to some small portion of the vehicle to be tracked. Since the referencing must be performed in a vehicle fixed coordinate system and the optical image is degraded due to disturbances such as atmospheric blurring, sensor noise, and diffraction, the referencing becomes quite difficult. These degradations, along with potentially coarse spatial quantization of the optical image [large pixel size driven by signal-to-noise ratio (SNR) considerations], also limit the ability of a human operator to interact with the optical system in real time to control the LOS. Several concepts to determine the real-time LOS control (vehicle intensity moments, neural networks, optical correlators, etc.) have been suggested in past studies, but generally have proven insufficiently sensitive or too complex to implement in a real-time system. The preliminary concept presented here centers on using a correlation tracker combined with a precomputed image sequence as a straightforward means to maintain a precision LOS. The concept employs the high SNR image within the correlation tracker reference map to make the relatively low bandwidth LOS corrections required. The corrections are determined by correlation of the tracker reference map imagery with a precomputed image sequence and thus provide the accuracy associated with the high SNR map image and high SNR precomputed image sequences. [The satellite tracking problem provides the tracker with viewing/aspect angle geometry, which is generally deterministic, within the uncertainty bounds of ephemeris and satellite attitude information, and thus stimulates the use of precomputed (simulated) imagery.] The precomputed image sequence provides the LOS control through registration of the desired vehicle fixed coordinate on the image with a fiducial point on the image array. We will discuss the theoretical basis, potential advantages, implementation, and performance [as determined by Time-Domain Analysis Simulation for Advanced Tracking (TASAT)] of the concept.

Proceedings Article | 25 November 1992 Paper

Time-domain analysis simulation for advanced tracking

James Riker, Gregg Crockett, Richard Brunson

Proceedings Volume 1697, (1992) https://doi.org/10.1117/12.138181

KEYWORDS: Systems modeling, Atmospheric optics, Sensors, Atmospheric modeling, Imaging systems, Data modeling, Image sensors, Computing systems, Atmospheric sensing, Point spread functions

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