Papers by Keyword: Positional Accuracy

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Authors: Gang Zhu Qiao, Jian Chao Zeng
Abstract: The path loss exponent shows the effect of space environment on the RF signals in wireless communication model. In most RSSI based location method the path loss exponent is assigned a fixed empirical value which can not reflect the actual environmental impact of the wireless signal, which lead to low position accuracy and considerable positioning error. Aiming at some complex and rapidly changing environment a path loss exponent dynamic acquired algorithm is proposed, which can calculate the actual path loss exponent with the distance and the RSSI value information between adjacent beacon nodes. On basis of the path loss exponent dynamic acquired algorithm a path loss exponent dynamic acquired based localization algorithm is proposed which can estimate the blind node position with the actual path loss exponent, and can improve the adaptability to the environment of the RSSI location algorithm. The simulation shows that the positioning accuracy of proposed method is significantly improved and the effect of proposed method is more precise than the common RSSI method under the same environment.
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Authors: Han Bin Xiao, Kai Fa Lu, Shi Qing Lu
Abstract: As a ship of high technology content, dredger is equipped with a very important structural part—spud. In actual working condition, spud is affected by seabed terrain and force of sediment. Moreover, water flow and wind will impact the hull. Consequently, the effect of moment of force on the hull’s center of gravity will cause heeling of the hull. This paper, with the help of geometrical relationship, is to quantificationally analyze and calculate the influence of transverse, longitudinal sloping and ordinary heeling on the underwater positioning accuracy of clamshell in the condition of heeling. Then it offers relevant compensation, in order to reduce the accuracy error of clamshell’s underwater positioning caused by hull’s heeling.
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