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Proceedings Paper

Multi sensor satellite imagers for commercial remote sensing
Author(s): T. Cronje; H. Burger; J. Du Plessis; J. F. Du Toit; L. Marais; F. Strumpfer
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Paper Abstract

This paper will discuss and compare recent refractive and catodioptric imager designs developed and manufactured at SunSpace for Multi Sensor Satellite Imagers with Panchromatic, Multi-spectral, Area and Hyperspectral sensors on a single Focal Plane Array (FPA). These satellite optical systems were designed with applications to monitor food supplies, crop yield and disaster monitoring in mind. The aim of these imagers is to achieve medium to high resolution (2.5m to 15m) spatial sampling, wide swaths (up to 45km) and noise equivalent reflectance (NER) values of less than 0.5%. State-of-the-art FPA designs are discussed and address the choice of detectors to achieve these performances. Special attention is given to thermal robustness and compactness, the use of folding prisms to place multiple detectors in a large FPA and a specially developed process to customize the spectral selection with the need to minimize mass, power and cost. A refractive imager with up to 6 spectral bands (6.25m GSD) and a catodioptric imager with panchromatic (2.7m GSD), multi-spectral (6 bands, 4.6m GSD), hyperspectral (400nm to 2.35μm, 200 bands, 15m GSD) sensors on the same FPA will be discussed. Both of these imagers are also equipped with real time video view finding capabilities. The electronic units could be subdivided into the Front-End Electronics and Control Electronics with analogue and digital signal processing. A dedicated Analogue Front-End is used for Correlated Double Sampling (CDS), black level correction, variable gain and up to 12-bit digitizing and high speed LVDS data link to a mass memory unit.

Paper Details

Date Published: 21 October 2005
PDF: 10 pages
Proc. SPIE 5978, Sensors, Systems, and Next-Generation Satellites IX, 59781J (21 October 2005); doi: 10.1117/12.627488
Show Author Affiliations
T. Cronje, SunSpace and Information Systems (South Africa)
H. Burger, SunSpace and Information Systems (South Africa)
J. Du Plessis, SunSpace and Information Systems (South Africa)
J. F. Du Toit, SunSpace and Information Systems (South Africa)
L. Marais, SunSpace and Information Systems (South Africa)
F. Strumpfer, SunSpace and Information Systems (South Africa)

Published in SPIE Proceedings Vol. 5978:
Sensors, Systems, and Next-Generation Satellites IX
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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