The use of dispersion to eliminate multipath in planetary radio occultations

Details The use of dispersion to eliminate multipath in planetary radio occultations The use of dispersion to eliminate multipath in planetary radio occultations

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rasc...11..629c&link_type=abstract

Radio Science, vol. 11, July 1976, p. 629-634.

Computer Science

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Ionospheric Sounding, Multipath Transmission, Planetary Atmospheres, Radio Occultation, Spacecraft Communication, Wave Dispersion, Continuous Wave Radar, Frequency Modulation, Phase Locked Systems, Planetary Ionospheres, Ray Tracing

Scientific paper

Occultation geometry is analyzed with a view toward eliminating all multipath resulting from layer effects. It is assumed that the spacecraft moves behind the planet with a constant velocity perpendicular to the direction from the spacecraft to the earth, and that for radio frequencies of 1 to 2 GHz the angle of refraction of a radio ray passing through the ionosphere is so small as to be imperceptible if drawn to scale. It is shown that if a particular amount of dispersion is inserted into the process at any stage prior to signal detection, the frequency vs time curve will be converted to a frequency vs ray asymptote height curve. Because there can be only one mode from any one ray asymptote height in a layered medium, frequency must be a single-valued function of this parameter. The introduction of an appropriate dispersion will therefore eliminate all multipath insofar as it is caused by spherically symmetric planetary layers. The degree of accuracy to be provided in flight and during postflight analysis is discussed.

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