On-board data processing for the IRAS telescope system

Astronomy and Astrophysics – Astronomy

Scientific paper

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Airborne/Spaceborne Computers, Data Processing, Infrared Astronomy Satellite, Infrared Telescopes, Aerospace Technology Transfer, Computerized Simulation, Infrared Filters, Microprocessors, Noise Reduction, Numerical Control, Signal Processing

Scientific paper

Onboard data processing has been developed for the Infrared Astronomical Satellite (IRAS) telescope system to effectively utilize the RF bandwidth and minimize the ground-data processing costs. Use of filtering techniques, data deglitching circuits, and data encoding algorithms are combined with a microprocessor-controlled telescope system to achieve a system dynamic range of 100,000 with a noise equivalent flux density of no less than 10 to the minus 19th W/sq cm. Extraneous data, e.g., noise due to radiation hits, will be removed prior to transmission, thereby optimizing ground-data processing for the highest sensitivity and reliability. Simulation results are presented which demonstrate the advantages gained through the use of onboard data processing and illustrate the possible merging of these techniques with an array for the future evolution of 'smart' sensors.

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