09-11-2017 дата публикации
Номер: US20170320599A1
Принадлежит:
Provided is an apparatus for controlling an orbiting satellite by sensing a change in a yaw angle of the orbiting satellite and calculating a ground sample distance (GSD) based on the yaw angle. The apparatus may include a sensor configured to sense a yaw angle corresponding to yaw steering of the orbiting satellite, and a processor configured to calculate, based on the yaw angle, a GSD corresponding to a length of a pixel projected onto a planetary surface scanned by the orbiting satellite. 1. An orbiting satellite comprising:a movement controller configured to control an attitude of the orbiting satellite, the attitude comprising an orbital velocity, a roll angle, a pitch angle and a yaw angle of the orbiting satellite;an image acquirer configured to scan a planetary surface in a scanning direction corresponding to the attitude; anda calculator:wherein the calculator is configured to:calculate a major axis and a minor axis of an ellipse corresponding to a trace of a pixel projected onto the planetary surface based on a change in the yaw angle;calculate a tilt angle between a direction vector and a line of sight (LOS) vector projected onto the planetary surface; and {'br': None, 'i': a', '+b, 'sup': 2', '2', '2', '2, 'GSD=√{square root over (cos (ψ+β)sin (ψ+β))}'}, 'calculate a ground sample distance (GSD) according to the following equationwherein:a is a length of the major axis;ψ is the yaw angle;β is the calculated tilt angle; andb is a length of the minor axis.2. The orbiting satellite of claim 1 , wherein the calculator is configured to project claim 1 , onto a plane in which the yaw angle is measured claim 1 , direction vector and the line of sight (LOS) vector of the image acquirer onto the planetary surface claim 1 , and to calculate the tilt angle between the projected direction vector and the projected LOS vector when the yaw angle is set to “0”.3. The orbiting satellite of claim 2 , wherein the calculator is configured to calculate the line rate based on ...
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