Journal of Navigation and Port Research 2013;37(4):375-381.
Published online August 31, 2013.
ASF 예측모델과 실측치를 이용한 영일만 해상 ASF 맵 생성기법
황상욱, 신미영, 최윤섭, 유동희, 박찬식, 양성훈, 이창복, 이상정
A generation method of ASF mapping by the predicted ASF with the measured one in the Yeongil Bay
Sang-Wook Hwang, Mi Young Shin, Yun Sub Choi, Donghui Yu, Chansik Park, Sung-Hoon Yang, Chang-Bok Lee, Sang Jeong Lee
Abstract
In order to establish eLoran system it needs the betterment of a receiver and a transmitter, the add of data channel to loran pulse for loran system information and the differential Loran for compensating Loran-c signal. Precise ASF database map is essential it the Loran delivers the high absolute accuracy of navigation demanded at maritime harbor entrance. In this study we developed the ASF mapping method using predicted ASFs compensated by the measured ASFs for maritime in the harbor. Actual ASF is measured by the legacy Loran signal transmitted from Pohang station in the GRI 9930 chain We measured absolute propagation delay between the Pohang transmitting station and the measurement points by comparing with the cesium clock for the calculation of the ASFs. Monteath model was used for the irregular terrain along the propagation path in the Yeongil Bay. We measured the actual ASFs at the 12 measurement points over the Yeongil Bay. In our ASF-mapping method we estimated that the each offsets between the predicted and the measured ASFs at the 12 sα1Ced points in the Yeongil. We obtained the ASF map by adjusting the predicted ASF results to fit the measured ASFs over Yeungil bay.
Key Words: ASF 맵; eLoran;HEA;ASF map;propagation delay;monteath model
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