Mars Polar Lander/Deep Space 2 Loss - Jpl Special Review Board Report: by National Aeronautics and Space Administration

By National Aeronautics and Space Administration

Book Id: WPLBN0000670261
Format Type: PDF eBook:
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Title:	Mars Polar Lander/Deep Space 2 Loss - Jpl Special Review Board Report: by National Aeronautics and Space Administration
Author:	National Aeronautics and Space Administration
Volume:
Language:	English
Subject:	Government publications, National Aeronautics and Space Administration (U.S.), NASA reference publication
Collections:	Space and Aviation eDocuments Collection, NASA Publication Collection
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Publisher:	National Aeronautics and Space Administration


Citation APA MLA Chicago And Space Administration, N. A. (n.d.). Mars Polar Lander/Deep Space 2 Loss - Jpl Special Review Board Report. Retrieved from https://self.gutenberg.org/

Excerpt
Excerpt: Low-Gain Antenna (LGA) Uplink The LGA is fixed and pointed at the approximate center of the nominal Earth azimuth range. In elevation, the LGA boresight is pointed approximately 43 degrees above the lander deck and the nominal horizon line. The mean Earth elevation angle is approximately 17 degrees above the horizon. In the worst-case azimuth orientation (180-degree error), the mean Earth would be 120 degrees off boresight. At 7.8125 bps, an uplink can be received by the spacecraft at up to 135 degrees off boresight. So there is at least a chance of getting an uplink into the spacecraft in the worst-case azimuth orientation. However, since Earth is frequently at lower than mean elevation, it is probably more realistic to consider a region of plus/minus 16 degrees (elevation error) around the worst-case landing azimuth error to be a ?command blind? zone...