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12 July 2019 On ground demonstrator of digital stabilization for high-resolution Earth observation time of delay integration imaging
S. Petit Poupart, A. Materne, C. Thiebaut, J. M. Delvit, C. Latry, B. Mithieux
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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 111804Q (2019) https://doi.org/10.1117/12.2536089
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece
Abstract
CNES (French Space Agency) has developed a dedicated test bench to demonstrate its solution of digital stabilization for relaxing the AOCS constraints for high-resolution Earth observation Time of Delay Integration (TDI) imaging, based on a CNES patent1. TDI sensors are sensitive to high frequency attitude disturbances which may induce blurring effects when increasing TDI stages number and thus exposure time. A solution to relax the microvibration constraints (or no longer constrain the number of lines to be accumulated) is to compute, in real-time, the shift between each line and coregister them before summation. CNES solution includes a motion sensor dedicated to shift measurements, a fast realtime algorithm to compute the shift between two consecutives images delivered by the motion sensor, a multi-frame TDI sensor, and an algorithm to resample images delivered by sub-TDI devices using computed shifts, before summing them up in order to obtain the final image. The optimization study of the motion sensor and the performances of the gradientbased algorithm on these images have been already presented in a previous paper2. In this paper, we describe the dedicated test bench which contains each part of the presented chain and the obtained performances.
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S. Petit Poupart, A. Materne, C. Thiebaut, J. M. Delvit, C. Latry, and B. Mithieux "On ground demonstrator of digital stabilization for high-resolution Earth observation time of delay integration imaging", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111804Q (12 July 2019); https://doi.org/10.1117/12.2536089
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KEYWORDS
Sensors
Modulation transfer functions
Signal to noise ratio
Cameras
CCD image sensors
Image quality
Image registration
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