On ground demonstrator of digital stabilization for high-resolution Earth observation Time of Delay Integration imaging

被引：0

作者：

Poupart, S. Petit ^{[1
]}

Materne, A. ^{[1
]}

Thiebaut, C. ^{[1
]}

Delvit, J. M. ^{[1
]}

Latry, C. ^{[1
]}

Mithieux, B. ^{[2
]}

机构：

[1] CNES, 18 Ave Edouard Belin, F-31401 Toulouse 9, France

[2] INTITEK, Paris, France

来源：

INTERNATIONAL CONFERENCE ON SPACE OPTICS-ICSO 2018 | 2018年 / 11180卷

关键词：

digital stabilization; Time of Delay Integration; Imaging; High-resolution; Earth observation; Microvibration; Motion; Test Bench;

D O I：

10.1117/12.2536089

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 patent(1). 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 real-time 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 gradient-based 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.

引用

页数：11