Computer Science – Performance
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983dsnr.nasa.....a&link_type=abstract
In its The Deep Space Network: A Radio Commun. Instr. for Deep Space Exploration 15 p (SEE N83-36302 24-32)
Computer Science
Performance
Faraday Effect, Plasma Oscillations, Radio Communication, Transmission Efficiency, Deep Space Network, Doppler Effect, Ground Stations, Mathematical Models, Rangefinding, Solar Wind, Wave Propagation
Scientific paper
Radio communication with space probes requires sending signals through the Earth's ionosphere and usually the solar wind. During planetary flybys, the signal may also pass through the ionosphere of another planet. These ionized media can perturb the radio signal in a variety of ways. Examples of these perturbations are variations in the electrical length between the spacecraft and the ground station, Faraday rotation of linearly polarized signals, amplitude and phase scintillations, and spectral and angular broadening. These plasma effects can have undesirable influences on telemetry performance and thus need to be understood from a communications engineering viewpoint. The plasma effects are, however, useful from a scientific viewpoint, since the effects on the communications link can often be inverted to estimate the physical conditions in the plasma.
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