Optimum frequencies for outer space communication

Haydon, George W.

doi:10.6028/jres.064d.017

Cited by 5 publications

(1 citation statement)

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“…Most of these take into account the variation of antenna noise temperature with frequency, and make assumptions about vehicle antenna, vehicle transmitter, ground antenna, etc. 19 " 22 Most of these studies arrive at an optimum somewhere in the middle of the range mentioned above, but it should be emphasized that the set of assumptions will be different for each case, hence the optimum frequency will also vary. Davies and Weaver 23 have derived optimum performance for a fixed vehicle weight as a function of range and bandwidth.…”

Section: Range Equationmentioning

confidence: 99%

Communications at megamile ranges

Hansen

Stephenson

1961

Journal of the British Institution of Radio Engineers

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Megamile communications call for the fullest use of advanced modern technology. This paper surveys the design of a deep-space communication system. The basic constraints and capabilities of a low-noise ground receiving system are covered in detail, including antenna temperature contributions from galactic noise, tropospheric and ionospheric attenuation, and earth radiation through antenna side lobes. Low-noise preamplifiers, large high-gain antennas, and narrow-band phase-lock receivers are also considered. Digital biphase modulation, used in Pioneer V, is compared with more sophisticated bi-orthogonal coding systems. Both types of coding systems are compared with error rate as a parameter, with the ideal error-free Shannon limit. The design of Pioneer V and its record of achievement are described. Included are explanations of the coherent transponder within the spacecraft, and of the command transmitter and telemetry reception equipment at the ground stations.

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Section: Range Equationmentioning

confidence: 99%