Accession Number : AD0830434

Title :   ACCURACY IMPROVEMENT OF MARTIAN PROBE BY POST-ESCAPE CORRECTION AND IMPROVED DETERMINATION OF THE ASTRONOMICAL CONSTANT,

Corporate Author : GENERAL DYNAMICS/ASTRONAUTICS SAN DIEGO CA

Personal Author(s) : Ehricke, K. A.

Report Date : 01 AUG 1958

Pagination or Media Count : 37

Abstract : The principal conclusion of the previous investigation of the error coefficients of a Mars probe and of the effect of the uncertainty of the astronomical unit on the probable error near Mars was that miss distances of well over a million miles might occur as a result of purely ballistic launching without post-escape correction (ref. 1). This report discusses several approaches to determine the probe's orbit more correctly after escape from the Earth, based in part on terrestrial and spaceborne measurements by the probe and in part on improved determination of the astronomical constant during the transfer. (Author)

Descriptors :   (*MARS PROBES, MISS DISTANCE), (*INTERPLANETARY TRAJECTORIES, CORRECTIONS), ACCURACY, CIRCULAR ERROR PROBABLE, TRANSFER TRAJECTORIES, ORBITS, ASTRONOMY, PRESET GUIDANCE, MIDCOURSE GUIDANCE, INSTRUMENTATION, DESCENT TRAJECTORIES, SPACEBORNE, OPTICAL SCANNING, EARTH(PLANET).

Subject Categories : Unmanned Spacecraft
      Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE