Computer Science
Scientific paper
Aug 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974oppt.workr....g&link_type=abstract
In Dynatrend, Inc. Proc. of Outer Planet Probe Technol. Workshop, Sect. 1 through 11 11 p (SEE N75-20358 12-12)
Computer Science
Data Links, Data Systems, Spacecraft Communication, Telecommunication, Planetary Atmospheres, Radio Frequencies, Radio Relay Systems, Space Probes, Turbulence Models
Scientific paper
The communications system for the planetary entry missions is discussed with emphasis on the basic problems of the data link: uncertainty about atmospheric composition, time limitation for transmission, and geometry variation or change in aspect angles. The baseline design for Pioneer is reviewed. In this design, telemetry is transmitted only during the descent phase of probe entry at 44 bits-per-second. It is indicated that this design encompasses different atmospheric entries for different planets, different atmospheric models of planetary atmospheres, and allows for dispersion in the entry angle and phasing. The radio frequency environment is considered to be the prime problem of the communication link, therefore a discussion of the ionospheric absorption and turbulence models is included.
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