Computer Science – Sound
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ep%26s...50..229o&link_type=abstract
Earth, Planets and Space, Volume 50, p. 229-234.
Computer Science
Sound
8
Scientific paper
A new altimeter has been developed for the observation of the land shape of a planet from an orbiting spacecraft by transmitting RF pulses. The present system utilizes an RF sounder for observing the electron density profile of the topside ionosphere by selecting a transmission frequency fhigher than the local cutoff frequency of the ionosphere by adding upper and lower side band modulations with a frequency p; i.e. at frequencies f+ pand f- p. The phase difference of the propagating signals at the upper and lower side band frequencies gives a fine delay time with a range resolution of 100m for p= 50 kHz and 20m for p= 250 kHz with f= 9 MHz corresponding to a resolution of 6° of the phase detector of the system onboard the spacecraft. Using 600 Watts transmitting power applied to a 52m tip-to-tip dipole antenna, the altitude of the spacecraft and the land shape can be measured while the spacecraft is in the range below 300km altitude at the planet.
Ono Takafumi
Oya Hiroshi
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