Television antenna directing and tracking system for television program network between air-borne and ground offices

摘要

This invention relates to a television antenna directing and tracking system for directing a television repeating or relaying antenna mounted on an aircraft toward a ground station. The air-borne office is provided with a coordinate transforming device for transforming the azimuth angle . phi..sub.A (t) and the elevation angle &thgr;.sub.A (t) which represent the direction of the aircraft with respect to the longitude and latitude of the globe or the globe coordinate into the azimuth angle &phgr;.sub.B (t) and the elevation angle &thgr;.sub.B (t) at the air-borne coordinate. The ground office is equipped with receiving means and tracking means and the air-borne office receives command signals regarding the azimuth angle &phgr;.sub.A (t) and the elevation angle &thgr;.sub.A (t) from the ground office. Further, the air-borne office is equipped with means for computing by itself the azimuth angle &phgr;.sub.A (t) and the elevation angle &thgr;.sub.A (t) based on the flight informations without the aid of the ground office.