| 摘要 |
PURPOSE:To realize a system which enables initial acquisition of light accurately between optical communication satellites by setting self-acquisition fields of view for both own satellite and a target satellite so that both fields of view thereof overlap therebetween while a tracking is set so that the acquisition fields of view thereof have no angular velocity relatively. CONSTITUTION:In an LEO (receiving side) and a GEO (transmitting side) within the same orbit plane, azimuths (alpha', beta', gamma') of a light antenna of the GEO must be within an acquisition field of view cone at azimuths (alpha, beta, gamma) of the LEO to let the LEO catch the GEO. Receiving command values, the LEO and GEO are made to overlap a scan cone of the GEO with an acquisition field of view cone of the LEO allowed for estimated orbit errors, attitude errors of the both and an azimuth error of the light antenna. Moreover, a pointing mechanism is controlled so that the centers of the acquisition fields of view are both zero in angular velocity relatively. With a relative angular velocity being zero, further a scanning is performed to control a pointing mirror so that instantaneous catching fields of view are seized. |
