Computer Science – Sound
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ssi.....4...57o&link_type=abstract
Space Science Instrumentation, vol. 4, Aug. 1978, p. 57-71.
Computer Science
Sound
Feasibility Analysis, Plasmapause, Sounding, Synchronous Satellites, Analog Simulation, Block Diagrams, Dipole Antennas, Electron Density Profiles, Numerical Control, Ray Tracing, Systems Engineering
Scientific paper
Typical plasmagrams representing echo soundings of the equatorial plasmapause from a geostationary satellite are calculated by ray tracing of VLF-LF waves transmitted inward from the satellite and using model profiles of the electron density around the plasmapause. The feasibility of plasmapause sounding from a geostationary satellite is then considered, particularly with respect to transmitter power, dipole antenna length, and parameters of transmitted pulses. It is shown that the sounding frequencies should lie between 10 kHz and 20 MHz. A plasmapause sounder design is developed which involves the use of 13-bit Barker coded pulses to reduce the transmitter power, a subpulse of 0.5 msec, and a pulse interval of 0.5 sec. Peak power requirements of 70 W for quiet periods and 700 W for geomagnetically disturbed periods are computed for the proposed sounder with a 400-m dipole antenna 1.2 cm in diameter.
Koseki Tadashi
Nakamura Yoshifumi
Ondoh Tadanori
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