Distribution characteristic of AIS signal field intensity along mountainous waterway

CHU Xiu-min; LIU Tong; MA Feng; LIU Xing-long; ZHONG Ming

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Article Navigation > Journal of Traffic and Transportation Engineering > 2014 > 14(6): 117-126

CHU Xiu-min, LIU Tong, MA Feng, LIU Xing-long, ZHONG Ming. Distribution characteristic of AIS signal field intensity along mountainous waterway[J]. Journal of Traffic and Transportation Engineering, 2014, 14(6): 117-126.

Citation:

CHU Xiu-min, LIU Tong, MA Feng, LIU Xing-long, ZHONG Ming. Distribution characteristic of AIS signal field intensity along mountainous waterway[J]. Journal of Traffic and Transportation Engineering, 2014, 14(6): 117-126.

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Distribution characteristic of AIS signal field intensity along mountainous waterway

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

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Author Bio:
CHU Xiu-min (1969-), male, researcher, PhD, +86-27-86581899, chuxm@whut.edu.cn.
Received Date: 2014-07-03
Publish Date: 2014-12-25

Abstract

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 distancegreater 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, and the values of correcting model are 1.071 dBm and 98.329% respectively.
- traffic information engineering,
- mountainous waterway,
- AIS,
- linear regression,
- Okumura-Hata model,
- field intensity

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References(20)

References

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