DSB方式ドップラーVORのモニタについて

抄録

Single sideband (SSB) doppler VHF omnidirectional radio range (D-VOR) has been widely used as a short-range air navigational system. While, double sideband (DSB) D-VOR has superior performances with respect to siting effects, course stability and a compatibility with present VOR receiving equiment, when compared to the SSB D-VOR. Accordingly, the DSB D-VOR has been adopted as a standard VOR in Japan.

However, the operational efficiency of VOR system has been depreciated owing to lack of stability of ordinary VOR monitor functions. On one hand, when the monitoring location of DSB D-VOR is close to the station, a distortion of the detected signal largely rises with the distance approaches. On this account, there are some cases where sufficient monitor performance cannot be obtained by the usual VOR monitoring system.

In order to eliminate these defects, it is worked out a new VOR monitoring system which is composed of a receiver with automatic gain control (AGC) amplifier, antenna breakdown detector and near field monitor with carrier phase compensation technique.

This paper describes improvements of the monitoring system for DSB D-VOR, and the results of the operational tests are presented.