Abstract
In the summer of 1989, a series of measurement of the 9970 Loran-C chain and the Kita-Kyushu Decca chain was made, using two ρ-ρ Loran-C receivers and a MS-2A Decca receiver aboard the training ship Hiroshima-maru. We made a series of passage under the Bisan-Seto-Oohashi which is located in the Inland Sea of Seto, observing the time-difference, amplitude and phase-difference on the receivers. When the ship was located in the vicinity of the bridge, large positioning errors were observed as the result of the field distortion. This paper presents the results of these measurement, and says that the disturbance of the electric field can be explained by assuming the bridge to be a one-wave-long-loop antenna.
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