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Record Details

Record 32 of 10341
Refraction effects on the Galileo probe telemetry carrier frequency
Author and Affiliation:
Atkinson, D. H.(Idaho, University, Moscow, United States)
Spilker, T. R.(Stanford University, CA, United States)
Abstract: As the Galileo probe relay radio link (RRL) signal propagates outward through the Jovian atmosphere, the atmosphere will manifest itself in two ways. First, the geometric path length of the signal is increased, resulting in a small change of the RRL signal departure angle from the proble (transmitter). Secondly, the velocity of the signal is decreased. For a spherical, static atmosphere with a known profile of refractivity versus altitude the effects of refraction on the RRL frequency can be found using a variation of standard ray-tracing techniques, whereby the ray departure angle is found by an iterative process. From the dispersive characteristics of a mixture of hydrogen and helium with trace amounts of methane and ammonia a simple model of the Jovian atmosphere is constructed assuming spherical symmetry and uniform mixing. The contribution to the RRL Doppler frequency arising from refraction is calculated, and its effect on the Doppler wind measurements is discussed.
Publication Date: Feb 01, 1991
Document ID:
19910042589
(Acquired Nov 28, 1995)
Accession Number: 91A27212
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Radio Science; p. 31-43; (ISSN 0048-6604); 26
Publisher Information: United States
Contract/Grant/Task Num: NGT-50075
Financial Sponsor: NASA; United States
Organization Source: Idaho Univ.; Moscow, ID, United States
Stanford Univ.; CA, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GALILEO PROBE; JUPITER ATMOSPHERE; RADIO TELEMETRY; WAVE PROPAGATION; AMMONIA; CARRIER FREQUENCIES; DOPPLER EFFECT; HELIUM; HYDROGEN; ITERATIVE SOLUTION; METHANE; PLANETARY ATMOSPHERES; RADIO RELAY SYSTEMS
Imprint And Other Notes: Radio Science (ISSN 0048-6604), vol. 26, Jan.-Feb. 1991, p. 31-43.
Availability Source: Other Sources
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