Title :
Position determination at sea using low-frequency radio waves--The effect of a nearby mountain
Author :
Taguchi, Kazuo ; Sao, Kazuo ; Yamashita, Michiko
Author_Institution :
Kagoshima University, Japan
fDate :
7/1/1987 12:00:00 AM
Abstract :
Measurements of direction-finding (DF) error in position determination based on low-frequency (LF) radio waves were made at sea employing the Decca navigation system. The measured DF error is found to be large when a mountain is nearby. Assuming the mountain to be a hemisphere with complex dielectric constant, we evaluate DF error using electrostatic theory. Analytical predictions of the expected position error caused by the mountain´s presence are qualitatively in fairly good agreement with measured values. In connection with this, fluctuations of the electric field intensities are also described.
Keywords :
LF radio propagation; Radio position measurement; Radio propagation terrain factors; Dielectric constant; Dielectric losses; Dielectric measurements; Electromagnetic propagation; Electrostatic measurements; Equations; Marine vehicles; Radio navigation; Sea measurements; Sea surface;
Journal_Title :
Oceanic Engineering, IEEE Journal of
DOI :
10.1109/JOE.1987.1145274
