| 摘要 |
PURPOSE:To eliminate the effect of an undesired wave in a short time, by composing a zero pattern of a radiation pattern in the arriving direction of a desired wave and then composing a zero point of the radiation pattern to an angle in the arriving direction of the undesired wave which is detected by another angle. CONSTITUTION:A detecting circuit 8 detects first the interference of an undesired wave in case when the arriving direction is known for a desired wave. If the interference is detected, a judging circuit 10 applies a judging signal to an angle indicating circuit 10 to detect the arriving direction of the undesired wave. The circuit 10 indicates the arriving direction thetaS of the desired wave and an optional angle thetaN other than thetaS to the next arithmetic circuit 12. The circuit 12 forms a zero point in the direction thetaS based on the above-mentioned judging signal and an angle indication and then calculates an oscillating distribution to form a zero point also to the angle thetaN. The circuit 10 replaces successively the angle thetaN and detects the angle thetaN in the arriving direction of the undesired wave where the electric power received at a signal receiver 7. For a radiation pattern obtained under such conditions, a main beam is turned toward the desired wave and a zero point is composed in the arriving direction of the undesired wave. As a result, the effect of the undesired wave can be eliminated. |
