| 摘要 |
<p>PURPOSE:To enhance the data rate without increasing the rotation number of an antenna, by giving a function, which scans electronically beams in the vertical direction, to plural radiation faces. CONSTITUTION:A radiation face 11 for search and tracking and a radiation face 12 only for tracking are provided. Search beams 13, 14, and 15 are adjacent to one another in the vertical direction, and the beam 13 is narrow, and beams 14 and 15 are wide. Beams are rotated mechanically in the azimuthal direction while scanning electronically in positions 13, 14, and 15 to perform the search in the range of a maximum 360 deg.. Tracking beams 16 and 17 are formed a required angle apart from each other in the azimuthal direction. That is, plural radiation faces which can scan electronically beams are provided, and search beams or tracking beams are formed in only one direction from one radiation face to the azimuthal direction, and plural tracking beams are formed from the other radiation face in the azimuthal direction, and backs of radiation faces are allowed to face to each other if two radiation faces are provided, and radiation faces are arranged on respective sides of a polygon and are rotated mechanically in the azimuthal direction if three or more radiation faces are provided.</p> |
