Computer Science – Performance
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jbis...30..242s&link_type=abstract
British Interplanetary Society, Journal (Space Technology), vol. 30, July 1977, p. 242-256.
Computer Science
Performance
Mars Probes, Planetary Landing, Terradynamics, Afterbodies, Atmospheric Entry, Deceleration, Impact Acceleration, Mars Surface, Performance Tests, Terminal Ballistics
Scientific paper
Surface penetrators are an adaptation to planetary landers of the terradynamic vehicles developed by ERDA. For most applications, the penetrator will be passively controlled to arrive at the surface in an attitude and with a velocity which will result in the terradynamic vehicle penetrating the surface. As the main vehicle containing the principal instruments and electronics penetrates below the surface, a separable afterbody containing the antenna and a transmitter and command receiver, as well as some science packages, is left behind on the surface. This afterbody remains connected to the penetrator with a multiconnector umbilical which is payed out during penetration. A sequence of science experiments is then conducted during the life of the vehicle (about 400 days) and the data stored in an onboard memory until it can be transmitted to an orbiting spacecraft for relay to earth. If the body being studied has an atmosphere, the problem of entry deceleration and attitude control are greatly simplified. Consequently, most of the attention for surface penetrators has been directed toward a planned 1981 launch of at least four Mars Penetrators.
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