Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977kosis..15..198k&link_type=abstract
Kosmicheskie Issledovaniia, vol. 15, Mar.-Apr. 1977, p. 198-202. In Russian.
Astronomy and Astrophysics
Astronomy
Astronavigation, Planetary Landing, Planetary Surfaces, Position (Location), Spacecraft Position Indicators, Azimuth, Optical Measurement, Reference Stars, Space Navigation
Scientific paper
The paper considers the problem of determining the location of a spacecraft at rest on a planetary surface from data obtained by optical measurements of the azimuth of a reference star (the sun). The optimum distribution of a given number of measurements minimizing the mathematical expectation of the spacecraft's rms deviation from a computed point on the surface is determined on the assumption that azimuth-measurement errors are unbiased and equal point-for-point. Cases where the measurement errors are independent and systematic are examined along with the general case where the solar declination is nonzero
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