Abstract: A debris removal device includes: an end mass adapted to approach debris to be removed; a debris capture device separably-mounted on the end mass; and a tether connecting the debris capture device and the end mass to each other. The debris capture device includes a harpoon adapted to penetrate into the debris, a shooting device adapted to shoot the harpoon, a guide member positioned to come into contact with the surface of the debris to adjust the shooting angle of the harpoon with respect to the surface of the debris, and a switch that sends the shooting signal to the shooting device. When the harpoon is penetrated into the debris, the end mass is separated from the debris capture device, and the tether is released into outer space.

Abstract: A debris removal device includes: an end mass adapted to approach debris to be removed; a debris capture device separably-mounted on the end mass; and a tether connecting the debris capture device and the end mass to each other. The debris capture device includes a harpoon adapted to penetrate into the debris, a shooting device adapted to shoot the harpoon, a guide member positioned to come into contact with the surface of the debris to adjust the shooting angle of the harpoon with respect to the surface of the debris, and a switch that sends the shooting signal to the shooting device. When the harpoon is penetrated into the debris, the end mass is separated from the debris capture device, and the tether is released into outer space.

Abstract: 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.