VOR PROPAGATION AND STABILITY STUDY.
OHIO UNIV ATHENS DEPT OF ELECTRICAL ENGINEERING
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Results of a theoretical and experimental study on VOR radial stability are presented. Error introduced by propagation effects have been bracketed and found to be less than 0.2 degree. Principal contributions to error and instability in the presentation of VOR radial position have been identified as variations in frequency of the auxiliary power source at the transmitter station, the VOR receiver responding to changes in signal level, and ambient temperature and receiver noise. Identified also are the effects of signals reflecting from aircraft which produce impulse type deviations in the CDI recordings. Results show line-of-sight stations to be less affected by reflections from aircraft than the diffraction site where the signal level is usually lower in magnitude. Statistical summaries are provided of the 12,312 hours of data collected using three line-of-sight monitor stations and one diffraction site ranging in distance from 150 feet to 42.2 miles. Author
- Navigation and Guidance