16 November 2000 Photogrammetrically measured distortions of a composite microwave reflector system in vacuum at ~90 K
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Abstract
The Microwave Anisotropy Probe (MAP) Observatory, scheduled for a 2001 launch, is designed to measure temperature fluctuations (anisotropy) and produce a high sensitivity and high spatial resolution (< 0.3 degree(s) at 90 GHz) map of the cosmic microwave background radiation over the entire sky between 22 and 90 GHz. MAP utilizes back-to-back Gregorian telescopes to focus the microwave signals into 10 differential microwave receivers, via 20 feed horns. Proper alignment of the telescope reflectors and the feed horns at the operating temperature of 90 K is a critical element to ensure mission success. We describe the methods and analysis used to validate the in-flight position and shape predictions for the reflectors based on photogrammetric metrology data taken under vacuum with the reflectors at approximately 90 K. Contour maps showing reflector distortions were generated. The resulting reflector distortion data are shown to be crucial to the analytical assessment of the MAP instrument's microwave system in- flight performance.
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Peter D. Mule, Peter D. Mule, Michael D. Hill, Michael D. Hill, Henry P. Sampler, Henry P. Sampler, "Photogrammetrically measured distortions of a composite microwave reflector system in vacuum at ~90 K", Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); doi: 10.1117/12.406550; https://doi.org/10.1117/12.406550
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