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Alsat-1: First Results of Multispectral Imager

By A. Rachedi A, N. Hadj-sahraoui A and A. Brewer B


into a 700 km sun synchronous orbit. Alsat-1 is an enhanced earth observation microsatellite (<100kg), stabilised in 3 axes for image acquisition mode. It was designed for disaster monitoring and is part of the international constellation dedicated to Disaster Monitoring (DMC), Alsat-1 payload is a multispectral imager, with two banks of 3 channels. Each bank works in a push broom mode and covers half of the whole image size with 5 % overlap. The total swath width is 600 km and images are taken at 32m GSD, on three spectral bands (Green, Red, NIR), identical to those of Landsat-TM. A windowing mode was implemented to add more flexibility to the system and to prevent the saturation of the three storage units: Two adding up Solid State Data Recorder (SSDR) totalising 1Gbytes data and one redundant unit of 128MBytes. The image data are sent to the ground station thanks to the high rate transmitters working in S-band at 8Mbps. Since Alsat-1 launch, the imager has taken more than 300 images. Their first evaluation showed a comparable quality to those from the similar satellites (Landsat-TM). The paper presents an overview of the Alsat-1 characteristics and shows the first results of the multispectral imager. 1. ALSAT-1 MISSION Alsat-1 is an earth observation satellite which evolves in a sunsynchronous retrograde circular orbit. Designed to be part of

Topics: KEY WORDS, Small/micro satellites, Observations, Camera, Imagery, Sensor, Pushbroom ABSTRACT, In November 2002, the 28 th, at 06, 07am GMT, was launched the 1 st Algerian satellite from the cosmodrome of Plesetsk in Russia
Year: 2011
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