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Proceedings Paper

Use of cross-validation and Monte Carlo simulation for estimating the parameters of beaconless free-space optical pointing and tracking
Author(s): Barbara E. Marino; Haiping Tsou; Tsun-Yee Yan
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Paper Abstract

To meet the micro-radian pointing accuracy required for deep space optical downlink telemetry, an algorithm has been proposed which uses the Earth as a beacon for locating the ground-based terminal. To enhance the resolution of the Earth beacon, a sequence of images is captured as the Earth image is moved across a CCD array in sub-pixel increments. Using this high resolution data, the algorithm then locates the ground-based terminal. The algorithm relies on two parameters for its solution; this paper develops techniques for estimating these parameters. To improve accuracy, a low pass filter is used in a pre-processing step to reduce the thermal noise introduced by the CCD array. The optimal cutoff frequency of the low pass filter is estimated using cross validation. The other parameter to be determined is a threshold used to extricate the Earth image from the background of the image. For this, a Monte Carlo simulation is used to determine the threshold that minimizes the mean squared error between the estimate and true locations of the ground-based terminal. Simulations indicate that the parameters can be determined very accurately using these methods. Results are presented.

Paper Details

Date Published: 26 April 2002
PDF: 11 pages
Proc. SPIE 4635, Free-Space Laser Communication Technologies XIV, (26 April 2002); doi: 10.1117/12.464096
Show Author Affiliations
Barbara E. Marino, Loyola Marymount Univ. (United States)
Haiping Tsou, Jet Propulsion Lab. (United States)
Tsun-Yee Yan, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4635:
Free-Space Laser Communication Technologies XIV
G. Stephen Mecherle, Editor(s)

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