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基于SUKF算法的组合导航方法 被引量:2
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作者 李厚全 苑秉成 唐劲松 《鱼雷技术》 2010年第3期209-213,共5页
合成孔径声纳(SAS)运动补偿是其信号处理的重要环节,运动补偿需要水下导航数据,文中研究了基于捷联惯导(SINS)和多普勒声速剖面仪(ADCP)等设备的水下导航方法。针对大姿态误差角情况下的导航,论文建立了基于四元数的SINS/ADCP的非线性... 合成孔径声纳(SAS)运动补偿是其信号处理的重要环节,运动补偿需要水下导航数据,文中研究了基于捷联惯导(SINS)和多普勒声速剖面仪(ADCP)等设备的水下导航方法。针对大姿态误差角情况下的导航,论文建立了基于四元数的SINS/ADCP的非线性误差模型,并采用比例无迹卡尔曼滤波(SUKF)滤波算法进行了仿真。仿真结果表明,在SAS复杂运动情况下,采用非线性误差模型的SUKF方法优于传统线性误差模型的卡尔曼滤波方法,在一定程度上提高了SAS的导航精度。 展开更多
关键词 合成孔径声纳 组合导航 比例无迹卡尔曼滤波 捷联惯导 多普勒声速剖面仪
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Highly nonlinear internal solitary waves over the continental shelf of the northwestern South China Sea 被引量:11
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作者 徐振华 尹宝树 侯一筠 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2010年第5期1049-1054,共6页
Large amplitude internal solitary waves(ISWs) often exhibit highly nonlinear effects and may contribute significantly to mixing and energy transporting in the ocean.We observed highly nonlinear ISWs over the continent... Large amplitude internal solitary waves(ISWs) often exhibit highly nonlinear effects and may contribute significantly to mixing and energy transporting in the ocean.We observed highly nonlinear ISWs over the continental shelf of the northwestern South China Sea(19°35'N,112°E) in May 2005 during the Wenchang Internal Wave Experiment using in-situ time series data from an array of temperature and salinity sensors,and an acoustic Doppler current profiler(ADCP).We summarized the characteristics of the ISWs and compared them with those of existing internal wave theories.Particular attention has been paid to characterizing solitons in terms of the relationship between shape and amplitude-width.Comparison between theoretical prediction and observation results shows that the high nonlinearity of these waves is better represented by the second-order extended Korteweg-de Vries(KdV) theory than the first-order KdV model.These results indicate that the northwestern South China Sea(SCS) is rich in highly nonlinear ISWs that are an indispensable part of the energy budget of the internal waves in the northern South China Sea. 展开更多
关键词 internal solitary wave high nonlinearity South China Sea (SCS)
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Characteristics of nonlinear internal waves observed in the northern South China Sea 被引量:2
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作者 司广成 侯一筠 +1 位作者 齐鹏 胡珀 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2010年第5期1068-1072,共5页
The South China Sea(SCS) is one of the most active areas of internal waves.We undertook a program of physical oceanography in the northern South China Sea from June to July of 2009,and conducted a 1-day observation fr... The South China Sea(SCS) is one of the most active areas of internal waves.We undertook a program of physical oceanography in the northern South China Sea from June to July of 2009,and conducted a 1-day observation from 15:40 of June 24 to 16:40 of June 25 using a chain of instruments,including temperature sensors,pressure sensors and temperature-pressure meters at a site(117.5°E,21°N) northeast of the Dongsha Islands.We measured fluctuating tidal and subtidal properties with the thermistor-chain and a ship-mounted Acoustic Doppler Current Profiler,and observed a large-amplitude nonlinear internal wave passing the site followed by a number of small ones.To further investigate this phenomenon,we collected the tidal constituents from the TPXO7.1 dataset to evaluate the tidal characteristics at and around the recording site,from which we knew that the amplitude of the nonlinear internal wave was about 120 m and the period about 20 min.The horizontal and vertical velocities induced by the soliton were approximately 2 m/s and 0.5 m/s,respectively.This soliton occurred 2-3 days after a spring tide. 展开更多
关键词 thermistor-chain nonlinear internal wave SOLITON TPXO7.1
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Analysis of internal tidal characteristics in the layer above 450 m from acoustic Doppler current profiler observations in the Luzon Strait 被引量:4
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作者 LIAO GuangHong YUAN YaoChu +4 位作者 Kaneko ARATA YANG ChengHao CHEN Hong Taniguchi NAOKAZU Gohda NORIAKI 《Science China Earth Sciences》 SCIE EI CAS 2011年第7期1078-1094,共17页
The characteristics of internal tides in the upper layer of the Luzon Strait are investigated on the basis of direct-observation current data recorded on April 25 and September 26, 2008 by an acoustic Doppler current ... The characteristics of internal tides in the upper layer of the Luzon Strait are investigated on the basis of direct-observation current data recorded on April 25 and September 26, 2008 by an acoustic Doppler current profiler. Spectral analysis and energy estimation show that the diurnals and semidiurnals carry most of the energy of internal tides. Values of the depth-integrated total energy E for the three frequency bands of diurnal, semidiurnal, and high frequencies are 31, 6.9, and 3.4 kJ. m, respectively. Near-inertial peaks are only present in the baroclinic component. The behavior of typical tidal frequencies (i.e., O1, K1, M2, MK3, and M4) and the near-inertial frequency is basically consistent with linear internal wave theory, which predicts E+(ω)/E_(ω)=(ω-f)2/(ω+f)2 at depths above 66 m, while not all prominent tidal components coincide well with the relation of the linear internal wave field at other depths. Examinations of depth structures of the baroclinic tides and temporal variations show that the surface tides and internal tides are both of mixed type, having diurnal inequality and spring-neap fortnight periods. The K1 and O1 tides have comparable cross- and along-shelf components, while the M2 and S2 tides propagate toward the shelf in the northern South China Sea as wave beams. The amplitude and phase of internal tides vary with time, but M2 and S2 tides appear to have structures dominated by the first mode, while the K1 and O1 tides resemble second-mode structures. The minor to major axis ratios are close to expected values of flω in the thermocline. 展开更多
关键词 current observation acoustic Doppler current prof'fler internal tides internal waves Luzon Strait
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