|Table of Contents|

Distribution characteristic of AIS signal field intensity along mountainous waterway(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2014年06期
Page:
117-126
Research Field:
交通信息工程及控制
Publishing date:

Info

Title:
Distribution characteristic of AIS signal field intensity along mountainous waterway
Author(s):
CHU Xiu-min1;  LIU Tong1;  MA Feng1;  LIU Xing-long1;  ZHONG Ming2
1. Engineering Research Center for Transportation Safety of Ministry of Education, Wuhan University ofTechnology, Wuhan 430070, Hubei, China; 2. Department of Civil Engineering, University of New Brunswick, Fredericton E3B 5A3, New Brunswick, Canada
Keywords:
traffic information engineering;  mountainous waterway;  AIS;  linear regression;  Okumura-Hata model;  field intensity
PACS:
U675.7
DOI:
-
Abstract:
Due to the shadowing effect of AIS mountains signals, there were many blind areas along mountainous waterways limiting the application of AIS. Okumura-Hata model was used to study the reliability of AIS communication system in those areas. 29 test points, which were primarily served by three base stations at Bahekou, Shipai, and Xiba located along the Three Gorges Dam segment, were set. Among the 29 test points, 13 test points were in mountainous areas and 16 test points were in open areas. The actual field intensities of the 29 test points were measured and compared with theoretical field intensities. A linear regression model was used to optimize the corrected parameter of Okumura-Hata model. The correcting field intensities at the 13 test points in mountainous areas and at 9 out of 16 test points in open areas, having a distance greater than 2.9 km from the base stations, were calculated. In order to verify the correctness of modified model, verification test was carried out for 6 test points along Chongqing—Yongchuan segment. Analysis result indicates that a distance of 3 km is a critical threshold for AIS signal transmission. When the propagation distance is less than 3 km, the AIS signal is good and the AIS field intensity curve is smooth. However, when the propagation distance is more than 3 km, the AIS signal quality reduces sharply and the curve is steep. The distribution trend of theoretical field intensity calculated by Okumura-Hata model is consistent with that of actual field intensity, but there are still gaps between the theoretical values and the actual values. In verification test, the average values of actual field intensity, theoretical field intensity, and correcting field intensity at 6 test points are-106.636, -100.982, -107.710 dBm, respectively. The average error and precision rate of calculated result of Okumura-Hata model are 5.654 dBm and 94.615% respectively, andthe values of correcting model are 1.071 dBm and 98.329% respectively. 4 tabs, 14 figs, 20 refs.

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Last Update: 2014-12-20