Page "Viking program" Paragraph 9
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An acquisition Sun sensor, a cruise Sun sensor, a Canopus star tracker and an inertial reference unit consisting of six gyroscopes allowed three-axis stabilization.
An X band downlink was also added specifically for radio science and to conduct communications experiments.
Uplink was via S band A two-axis steerable high-gain parabolic dish antenna with a diameter of approximately 1. 5 m was attached at one edge of the orbiter base, and a fixed low-gain antenna extended from the top of the bus.
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