Explorer Satellite Electronics
TL;DR: In this article, a discussion of the design restrictions and the philosophy which enabled the Explorer satellites to reveal the presence of a belt of intense cosmic radiation encircling the earth's equator.
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Abstract: A discussion is presented of the design restrictions and the philosophy which enabled the Explorer satellites to be first during the IGY to reveal the presence of a belt of intense cosmic radiation encircling the earth's equator. In addition, an indication of the amount and momentum of cosmic dust in the solar system was obtained from the Explorers. Methods used to obtain reliability in the transducing and communications system are described, together with interpretations of space-environment information as deduced from the narrow-band telemetry.
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Design of PM Communications Systems
R. L. Choate,R. L. Sydnor +1 more
TL;DR: In this paper, a direct approach to the design of PM communications systems utilizing phase-locked demodulators is developed, and the design procedure is illustrated by example, where the output signal-to-noise ratio is defined as the ratio of the mean information power output to the total mean-square closed-loop phase error.