Research Papers

Focal plane resolution and overlapped array time delay and integrate imaging

[+] Author Affiliations
Thomas J. Grycewicz, Stephen A. Cota

The Aerospace Corporation, 15049 Conference Center Drive, Chantilly, VA 20151-3824

Terrence S. Lomheim

The Aerospace Corporation, 2350 E. El Segundo Blvd., El Segundo, CA 90245-4691

Linda S. Kalman

The Aerospace Corporation, 15049 Conference Center Drive, Chantilly, VA 20151-3824

J. Appl. Remote Sens. 4(1), 043537 (June 15, 2010). doi:10.1117/1.3355378
History: Received July 29, 2009; Accepted December 3, 2009; June 15, 2010; Online June 15, 2010
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Abstract

In this paper we model sub-pixel image registration for a generic earth-observing satellite system with a focal plane using two offset time delay and integrate (TDI) arrays in the focal plane to improve the achievable ground resolution over the resolution achievable with a single array. The modeling process starts with a high-resolution image as ground truth. The Parameterized Image Chain Analysis & Simulation Software (PICASSO) modeling tool is used to degrade the images to match the optical transfer function, sampling, and noise characteristics of the target system. The model outputs a pair of images with a separation close to the nominal half-pixel separation between the overlapped arrays. A registration estimation algorithm is used to measure the offset for image reconstruction. The two images are aligned and summed on a grid with twice the capture resolution. We compare the resolution in images between the inputs before overlap, the reconstructed image, and a simulation for the image which would have been captured on a focal plane with twice the resolution. We find the performance to always be better than the lower resolution baseline, and to approach the performance of the high-resolution array in the ideal case. We show that the overlapped array imager significantly outperforms both the conventional high- and low-resolution imagers in conditions with high image smear.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Thomas J. Grycewicz ; Stephen A. Cota ; Terrence S. Lomheim and Linda S. Kalman
"Focal plane resolution and overlapped array time delay and integrate imaging", J. Appl. Remote Sens. 4(1), 043537 (June 15, 2010). ; http://dx.doi.org/10.1117/1.3355378


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