Computer Science
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975saosr.366.....g&link_type=abstract
SAO Special Report #366 (1975)
Computer Science
1
Scientific paper
A computer simulation of the ionospheric experiment of the Apollo-Soyuz Test Project (ASTP) has been performed. ASTP is the first example of USA/USSR cooperation in space and is scheduled for summer 1975. The experiment consists of performing dual-frequency doppler measurements (at 162 and 324 MHz) between the Apollo Command Service Module (CSM) and the ASTP Docking Module (DM), both orbiting at 221-km height and at a relative distance of 300 km. A network of ground stations will also operate and will collect differential and rotating doppler data in DM-to-ground radio paths. The computer simulation has shown that, with the doppler measurement resolution of approximately 3 mHz provided by the instrumentation (in 10-sec integration time), ionospheric-induced doppler shifts will be measurable accurately at all times, with some rare exceptions occurring when the radio path crosses regions of minimum ionospheric density. The computer simulation has evaluated the ability of the experiment to measure changes of columnar electron content between CSM and DM (from which horizontal gradients of electron density at 221-km height can be obtained) and to measure variations in DM-to-ground columnar content (from which an averaged columnar content and the electron density at the DM can be deduced, under some simplifying assumptions). The simulation has confirmed the expectation that simultaneous measurements of horizontal gradients and space-to-ground columnar content substantially increase the accuracy of data inversion.
Gay Ray H.
Grossi Mario D.
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