NASA NTRS · 19980227980
A Digital Solar Aspect Sensor
Abstract
The solar aspect sensor described herein performs the analog-to-digital conversion of data optically. To accomplish this, it uses a binary "Gray code" light mask to produce a digital indication, in vehicle-fixed coordinates, of the elevation and azimuth angles of incident light from the sun. This digital solar aspect sensor system, in Explorer X, provided measurements of both elevation and azimuth angles to +/- 2 degrees at a distance of over 140,000 statute miles.
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Albus, James S.. 1961-09-01. A Digital Solar Aspect Sensor. https://ntrs.nasa.gov/citations/19980227980
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