Near field monitoring system for the dsb d‐vor

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Abstract
Of the VORs providing directional information to aircraft, the new DSB‐type Doppler VOR has recently been employed as the domestic standard. In this system, the required receiving signal is obtained in the far field whereas the received signal is distorted if it is received near the VOR station. On the other hand, when a VOR station is installed, it is difficult to secure a larger area than the present one because the acquisition cost of the land is high and selection of the land becomes even more difficult if the traditional land requirement is modified. Therefore, the receiving antenna for monitoring the operating condition and the performance of the equipment is often installed near the VOR antenna so that the signal can be distorted for accurate monitoring unless an appropriate distance is maintained.This paper studies a method in which the DSB‐type Doppler VOR can be monitored even if the receiving distance is short. The circuit configuration is complicated in the method in which the phase of the carrier being received is forced to follow the phase change of the side band signal. Instead, this paper proposes a method for simplifying the circuit configuration by replacing the carrier wave with a new carrier with an appropriate fixed phase, and an experiment is carried out. It is found that the distortion is reduced significantly and a VOR direction characteristic close to the case for a far field reception even with a short receiving distance is obtained.

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