| 摘要 |
PURPOSE:To reduce the man-hour for adjustment by controlling a phase inver sion circuit by the detected phase difference of a phase difference detecting circuit and setting the output potential of a comparator at the positive or nega tive potential in accordance with the detected phase difference. CONSTITUTION:The signals L+R and L-R received by a radar antenna are respectively dropped by the 1st and 2nd mixer circuits 1 and 2, are amplified by the 1st IF circuits 3 and 4, are dropped again by the 2nd mixer circuits 5 and 6, are amplified by the prescribed rate by the 2nd IF circuits 7 and 8 and are respectively detected 11 and 12. The two detected 11, 12 signals are compared 10 of the level thereof by which the level difference is detected and outputted 13. On the other hand, the output signals of the circuits 1 and 2 are respectively brought to the specified levels by limiter circuits 14 and 15 and the phase difference of both signals is detected 16. A circuit 13 is so operated that the output signal of the circuit 10 attains negative potential when the detected phase difference is advanced than the phase of the detected 16 signal of the L antanna and attains positive potential in the opposite case. The level difference signal of the angle difference is thus controlled to the negative or positive potential by which the direction is obtd.
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