Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aiaa.meetq....a&link_type=abstract
American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting, 20th, Orlando, FL, Jan. 11-14, 1982, 8 p.
Astronomy and Astrophysics
Astronomy
Doppler Radar, Plasma Turbulence, Radar Tracking, Scintillation, Solar Corona, Solar Probes, Starprobe Mission, Turbulence Effects, Flyby Missions, Quadrupoles, Signal To Noise Ratios, Solar Interior, Solar Rotation, Stellar Structure, Velocity Measurement
Scientific paper
The telemetry and tracking problems expected for Starprobe, a solar flyby with a perihelion of 4 solar radii, are discussed. The Starprobe is intended to obtain measurements of the solar quadrupole moment within an accuracy of 1/100,000,000, allowing more accurate modelling of the solar interior. Obstacles are perceived for Doppler velocity measurements due to RF signal amplitude and phase scintillations created by the solar corona. Model calculations are presented for the propagation effects in the maximum disturbance area, and an open loop two-way Doppler system is described. The system comprises X-band and S-band uplinks and downlinks to eliminate the plasma-induced phase scintillations, means of correcting unfolding errors caused by S-band amplitude scintillations, and a new method of estimating the Doppler frequency.
Armstrong John W.
Koerner Mathias
Woo Richard
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