ドップラーVORの近距離受信特性
1989 年 1989 巻 63 号 p. 39-50
詳細
1989 年 1989 巻 63 号 p. 39-50
Doppler VHF omnidirectional radio range (D-VOR) has been widely used as a short-range air navigational system, and there are more than 80 D-VOR stations in JAPAN.
The bearing information of the D-VOR is generated by rotating sideband antenna on about 6.5 m radius circle. When receiving a D-VOR signal close to the station, the detected signal distrortion in the receiver largely rises with the distance approaches, owing to whirling of the antenna. On this account, there are some cases where sufficient monitor performance cannot be obtained at near field.
In the present paper, we describe the causes of subcarrier amplitude fluctuation and calculate the detected signal distortion at near field.
