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Patent Searching and Data


Title:
AUTONOMOUS ON-BOARD SATELLITE CONTROL SYSTEM
Document Type and Number:
WIPO Patent Application WO/1994/018073
Kind Code:
A1
Abstract:
Disclosed is an autonomous on-board satellite control system. Its purpose is to achieve autonomous orientation control and autonomous determination of the satellite's attitude and location in relation to the Earth's longitude and latitude grid. This is done with the aid of the following elements: an Earth sensor (1), a Pole-star sensor (2), a computer (4), a timing device (6) and actuator units (7). The system also includes a navigational star sensor (3) and a storage device (5), while the computer is designed so as to facilitate supplementary determinations. The orientation of the satellite is controlled by superimposing the general sensory plane (16) of the sensors (1 and 2) with the plane of the angle "centre of Earth - satellite - Pole star" which defines latitude. The geovertical (11) rotates about a line to the Pole star (12) as the satellite (8) moves in its orbit (9) and this is equivalent to the revolution of the stars in the field of vision of the sensors (2 and 3). The rotation of the plane containing the lines to the stars (12 and 18) is measured in relation to a reference line (19) whose longitude and angular parameter ("B") are kept in the storage device (5). Inertial longitude is calculated as the sum of the angle of measurement and the right ascension of the Pole star as the base longitude and is converted to the geocentric longitude by the known method. The attitude of the plane (16) to the latitudinal plane is calculated as the product of the polar distance of the Pole star and the sine of the angle of measurement, while its development gamma when in misalignment with the longitudinal axis (17) is calculated as the product of the angular dimension of the Earth's radius, the sine of the angle equal to the difference in longitudes of a target point (20) and the point below the satellite and the cosine of the latitude angle.

Inventors:
GNATJUK SEVASTIAN DMITRIEVICH (RU)
Application Number:
PCT/RU1993/000262
Publication Date:
August 18, 1994
Filing Date:
November 10, 1993
Export Citation:
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Assignee:
GNATJUK SEVASTIAN DMITRIEVICH (RU)
International Classes:
B64G1/24; B64G1/36; G01S3/786; G01S5/16; G05D1/08; B64G1/28; (IPC1-7): B64G1/24
Foreign References:
FR2637565A11990-04-13
FR2583873A11986-12-26
FR2670745A11992-06-26
DE3417661A11984-11-15
US4294420A1981-10-13
US5108050A1992-04-28
US5054719A1991-10-08
Other References:
G.G. BEBENIN et al., "Sistemy Upravlenia Poletom Kosmiches-Kikh Apparatov", 1978, Mashinostoenie (Moscow), pages 261-262.
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