Taiwan Island is at the joint of Eurasian Continent and Pacific Plate, under threatening of typhoons and northeasterly strong winds. Consequently, enormous human lives and properties are lost every year. It is necessa...Taiwan Island is at the joint of Eurasian Continent and Pacific Plate, under threatening of typhoons and northeasterly strong winds. Consequently, enormous human lives and properties are lost every year. It is necessary to develop a coastal sea-state monitoring system. This paper introduces the coastal sea-state monitoring system （CSMS） along Taiwan coast. The COMC （Coastal Ocean Monitoring Center in National Cheng Kung University） built the Taiwan coastal sea-state monitoring system, which is modern and self-sufficient, consisting of data buoy, pile station, tide station, coastal weather station, and radar monitoring station. To assure the data quality, Data Quality Check Procedure （DQCP） and Standard Operation Procedure （SOP） were developed by the COMC. In further data analysis and data implementation of the observation, this paper also introduces some new methods that make the data with much more promising uses. These methods include empirical mode decomposition （EMD） used for the analysis of storm surge water level, wavelet transform used for the analysis of wave characteristics from nearshore X-band radar images, and data assimilation technique applied in wave nowcast operation. The coastal sea-state monitoring system has a great potential in providing ocean information to serve the society.展开更多
天地波组合传播模式高频外辐射源雷达受电离层和海洋表面环境、短波段电磁环境及收发配置等诸多因素的影响.针对该新体制外辐射源雷达的定位问题,研究了天地波组合传播模式下的目标定位模型,提出了一种基于直达波到达仰角的定位新方法,...天地波组合传播模式高频外辐射源雷达受电离层和海洋表面环境、短波段电磁环境及收发配置等诸多因素的影响.针对该新体制外辐射源雷达的定位问题,研究了天地波组合传播模式下的目标定位模型,提出了一种基于直达波到达仰角的定位新方法,并分别从测量误差理论和几何精度因子(Geometric Dilution Of Precision,GDOP)两方面分析了定位精度与目标方位的关系.仿真结果表明,在简化定位模型的情况下,利用该方法的定位结果在一定区域内仍然具有较高的定位精度,根据研究结果有针对性地提供了改善定位精度的工程方案.展开更多
基金supported by National Natural Science Foundation of China (Grant No. 51109075)Fundamental Research Funds for the Central Universities (Grant No. 2011B05814)Doctoral Fund of Ministry of Education of China (Grant No. 20100094120008)
文摘Taiwan Island is at the joint of Eurasian Continent and Pacific Plate, under threatening of typhoons and northeasterly strong winds. Consequently, enormous human lives and properties are lost every year. It is necessary to develop a coastal sea-state monitoring system. This paper introduces the coastal sea-state monitoring system （CSMS） along Taiwan coast. The COMC （Coastal Ocean Monitoring Center in National Cheng Kung University） built the Taiwan coastal sea-state monitoring system, which is modern and self-sufficient, consisting of data buoy, pile station, tide station, coastal weather station, and radar monitoring station. To assure the data quality, Data Quality Check Procedure （DQCP） and Standard Operation Procedure （SOP） were developed by the COMC. In further data analysis and data implementation of the observation, this paper also introduces some new methods that make the data with much more promising uses. These methods include empirical mode decomposition （EMD） used for the analysis of storm surge water level, wavelet transform used for the analysis of wave characteristics from nearshore X-band radar images, and data assimilation technique applied in wave nowcast operation. The coastal sea-state monitoring system has a great potential in providing ocean information to serve the society.
文摘天地波组合传播模式高频外辐射源雷达受电离层和海洋表面环境、短波段电磁环境及收发配置等诸多因素的影响.针对该新体制外辐射源雷达的定位问题,研究了天地波组合传播模式下的目标定位模型,提出了一种基于直达波到达仰角的定位新方法,并分别从测量误差理论和几何精度因子(Geometric Dilution Of Precision,GDOP)两方面分析了定位精度与目标方位的关系.仿真结果表明,在简化定位模型的情况下,利用该方法的定位结果在一定区域内仍然具有较高的定位精度,根据研究结果有针对性地提供了改善定位精度的工程方案.
