| 摘要 |
PURPOSE:To narrow the range of a blind zone and decrease the influence by the input level differences of sensitivity by comparing the levels of all the reception signals of every antenna, detecting their reception and subjecting these outputs to predetermined logic processing. CONSTITUTION:The reception signals of antennas 1-4 are detected and the levels of all the reception signals A-D are compared in an amplifying comparator 9. On the other hand, the reception signals are detected with a signal detecting circuit 17 in which threshold is set. The outputs of the circuits 9, 17 are subjected to logic processing based on the formula I by a logic circuit 18, whereby the bearing is decided. With this constitution, the blind zone is narrow and since the circuit 9 has no direct relation with sensitivity, the sensitivity hardly receives the influence of input level differences, thus the bearing is detected highly accurately and stably. Further, if the blind zone is utilized, the bearings between the bearings A-C are determined as well. |
