| 摘要 |
PURPOSE:To achieve a higher accuracy by combining a rough measurement method employing a fixed antenna system with a broad beam width and a precise measurement method employing a multibeam array antenna system with a small beam width. CONSTITUTION:An arithmetic processing circuit 3 received levels Si-1, Si and Si+1 from receivers 2i-1, 2i, 2i+1 connected to antennas 1i-1, 1i and 1i+1 in a rough bearing measurement system 4 to determine the incoming bearing of a radio wave. Then, a beam control circuit 8 receives the bearing information calculated with the arithmetic processing circuit 3 to rotate the array antenna 5 in the precise bearing measuring system 10 electronically. A switch matrix 7 is so controlled to connect five output terminals Cj-2, Cj-1, Cj, Cj+1 and Cj+2 of a lens matrix 6 corresponding to five radiation patterns with the proximity of the bearing corresponding to the front of the beam to receivers 9a, 9b, 9c, 9d and 9e. |
