| 摘要 |
An antenna pointing equipment of the present invention includes an error estimating section and a pointing angle correcting section. The error estimating section records the difference between a pointing mechanism angle detected by an angle detector and a reference angle estimated by a satellite position calculator, a pointing angle calculator and an angle estimating section in the tracking control mode and, for example, averages recorded differences to obtain a quantitative error of the estimated reference angle in the acquisition control mode. The pointing angle correcting section corrects the estimated reference angle for its error. The antenna pointing equipment also includes an area-impossible-to-track controller. The controller obtains an area which cannot be tracked by the antenna on the basis of orbital elements of a space navigation satellite and a target and forcible switches from the tracking control mode to the acquisition control mode when the target enters that area. In the acquisition control mode, the target direction at the time when the target goes out of that area is obtained and the reference angle of the antenna at that time is calculated.
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