PLANE TABLE FOR OBSERVATION OBJECT SELECTION FROM AN ORBITING SPACE VEHICLE Russian patent published in 2008 - IPC G01C21/24 G09B29/00 

FIELD: physics; space.

SUBSTANCE: invention pertains to devices for space navigation and is directed at providing for the possibility of selecting under conditions of a space vehicle, observation objects with simultaneous consideration of the stipulated conditions, related to objects on the earth's surface and in the celestial sphere. This result is provided for due to that, the plane table for selection of the observation object from an orbiting space vehicle consists of a plate with a map of the earth's surface, a semitransparent plate with an image of the curved line of the orbit pass of the space vehicle from its ascending node, installed over the map of the earth's surface with provision for displacement along the equator of the earth, a semi transparent plate with an image of the objects on the stellar map, installed over the map of the earth's surface with provision for movement along the earth's equator line, and a device providing for mutual displacement of plates along the equator line. On the axes, perpendicular to the equator, the scale of the stellar map and the corresponding size of the plates with the given map coincide with the scale of the map of the earth's surface and the corresponding size of the plate with the map of the earth's surface, and on the equatorial axes, the scale of the stellar map and the map of the earth's surface have a ratio of 1:K, where K is the coefficient of concordance for the scales of the equatorial scales, defined from the formula K=1-Tω/(2π+Δ Ω), where T is the orbiting period of the space vehicle around the earth, ω is the angular velocity of rotation of the earth in the inertial space, Δ Ω is the turning precession orbit in the inertial coordinate system. The maps are made with the longitudinal dial of the earth's surface in the range from 0 to 4π+Δ Ω-Tω and the straight ascendancy scale of the stellar map in the range from 0 to 4π+Δ Ω, and the size of the plates with orbit and with maps of the earth's surface and the celestial sphere along the equatorial axes are in the ratio (2π+Δ Ω-Tω):(4π+Δ Ω-Tω):(4π+Δ Ω-Tω-2πTω/(2π+Δ Ω)).

EFFECT: possibility of selection of observation objects under conditions of a space vehicle.

2 dwg