一种改进的UKF滤波算法在BDS/SINS组合导航系统中的应用研究     

马晓杰  林雪原  孙巧妍  陈祥光 《大地测量与地球动力学》2021,41(4):351-356

将自适应估计原理引入UKF（unscented Kalman filter）算法中,该改进算法可以自适应地调节系统模型信息在导航解中的比重,从而减少滤波器初值偏差和系统模型异常扰动对导航解的影响。将改进的UKF算法应用于BDS/SINS（北斗/捷联惯导）组合导航系统中,仿真结果验证了其有效性,且该算法可提高组合导航系统的精度。  相似文献   

贵州剑河乌溜-曾家崖寒武系第5阶全球层型剖面及点位研究的新资料   总被引：1，自引：0，他引：1  

Frederick A.Sundberg  赵元龙  袁金良  林日白 《地层学杂志》2010,34(3)

贵州剑河八郎乌溜—曾家崖寒武系第5阶底界潜在的全球层型剖面及点位上下的动物群(三叶虫和无铰纲腕足类)有显著的变化;研究的剖面厚约4.5m,穿过首现点位Oryctocephalus indicus。经逐层化石的采集和深入的研究,证实在寒武系第4阶或寒武系第2统顶部Ovatoryctocara granulata-Bathynotus holopygus带与寒武系第5阶或寒武系第3统底部Oryctocephalus indicus带之间大约有20cm的贫化石间隔区。这一动物群的突变是在均一的岩相中发生的,表明该剖面是建立寒武系第5阶(或第3统)底界的全球层型剖面和点位(GSSP)理想剖面。  相似文献   

近千年来三个气候特征时期东亚夏季风的模拟对比     

况雪源  刘健  林惠娟  王红丽  提汝媛 《地球科学进展》2010,25(10):1082-1090

利用全球海气耦合气候模式ECHO-G的近千年连续积分资料,选取与降水关系较好的东亚夏季风指数,对不同气候特征时期的东亚环流及季风影响因子进行了探讨.结果表明用海陆热力差异定义的东亚夏季风指数Isun在年际尺度上较好地体现了长江流域及华北地区降水的变化,而利用850 hPa纬向风场定义的指数Iwang在年代际尺度上较好地体现了长江流域的降水变化.从不同气候特征时期的环流来看,中世纪暖期夏季风最强,东亚大陆降水明显偏多,现代暖期夏季风较之有所减弱,而小冰期则是夏季风最弱的时期,东亚大陆的降水明显偏少.不同气候特征时期夏季风指数与海温的相关表明,ENSO事件对东亚夏季风的影响在现代暖期有所增强,而与外部强迫因子的相关揭示出中世纪暖期有效太阳辐射变化是影响东亚夏季风变化的主要因子,现代暖期则是温室气体对夏季风的影响更重要.  相似文献   

太湖沉积物中镉的赋存形态及其与河蚬体内富集的关系   总被引：1，自引：0，他引：1  

任静华  马宏瑞  王晓蓉  耿金菊  顾雪元 《湖泊科学》2011,23(3):321-324

通过实验室模拟的方法,将河蚬暴露于镉(Cd)污染太湖沉积物中,研究河蚬软体组织中Cd富集量及其水环境中Cd的分布规律.同时采用薄膜扩散梯度技术(DGT)和BCR形态分析法分别测定沉积物中Cd的有效形态和释放规律.以获得三种方法预测沉积物基准方法的适用性.结果表明,随着加标浓度增大,DGT和BCR测得Cd浓度值增高,上覆...  相似文献   

Integrated Reservoir Prediction and Oil-Gas Evaluation in the Maoshan Area     

HAO Peidong  CUI XiuqinNo. Geophysical Prospecting Party  East China Petroleum Bureau  China National Star Petroleum Corporation  Building  Tiantan Xincun  Guanghua Rd.  Nanjing 《《地质学报》英文版》2000,74(3):697-700

The Maoshan area is an area with well-developed igneous rocks and complex structures. The thickness of the reservoirs is generally small. The study of the reservoirs is based on seismic data, logging data and geological data. Using techniques and software such as Voxelgeo, BCI, RM, DFM and AP, the authors have made a comprehensive analysis of the lateral variation of reservoir parameters in the Upper Shazu bed of the third member of the Palaeogene Funing Formation, and compiled the thickness map of the Shazu bed. Also, with the data from ANN, BCI and the abstracting method for seismic characteristic parameters in combination with the structural factors, the authors have tried the multi-parameter and multi-method prediction of petroleum, delineated the potential oil and gas areas and proposed two well sites. The prediction of oil and gas for Well JB2 turns out to be quite successful.  相似文献   

Ore-bearing Formations and Mineral Resource Prospects of the Peripheral Areas of the Tarim Block     

HE Jurui  RUI Xinjian  GUO Kunyi  WU Quanhuai  LIU Hongying  Nanjing Institute of Geology  Mineral Resources  Geological Survey of Chin  East Zhongshan Rd.  Nanjing  JiangsuWANG FutongBureau of Geology  Mineral Resources Exploration  Development of Xinjiang  Urumqi  Xinjiangand SUN ChuanminChengdu Institute of Technology  Chengdu  Sichuan 《《地质学报》英文版》2000,74(3):473-477

The tectonic development of the Tarim block has experienced four stages, i. e. Earth's core accretion and block formation in the Precambrian, margin splitting, opening-closing and piecing up in the Early Palaeozoic, rift formation and plate unification in the Late Palaeozoic, and basin-mountain coupling and landform shaping in the Meso-Cenozoic, forming six ore-bearing formations and ore deposits of various genetic types in the Tianshan Mountains, Kunlun Mountains and Altun Mountains. In the peripheral areas of Tarim there are four giant intercontinental metallogenic belts passing through, the Central Tianshan and southwestern Tianshan belts in the former USSR and the Qinling-Qilian-Kunlun and Palaeo-Tethys belts in China. According to the macro-analysis on the nearly one thousand known deposits (occurrences) and geophysical-geochemical anomalies, and the information from reconnaissance in some areas, the region has very good prospects for mineral resources. Some of the metallogenic belts may well becom  相似文献   

Lithospheric Evolution and Geodynamic Process of the Qinghai-Tibet Plateau:An Inspiration from the Yadong-Golmud-Ejin Geoscience Transect     

LI Tingdong  GAO Rui  WU Gongjian Chinese Academy of Geological Sciences  Baiwanzhuang Rd. Beijing Fei Zhenbi 《《地质学报》英文版》1999,73(2):173-180

The Tibet Geoscience Transect (Yadong-Golmud-Ejin) has revealed the basic structures, tectonic evolution and geodynamic process of the lithosphere of the Qinghai-Tibet plateau. The evidence of northward thrusting of the Indian plate beneath the Himalayans on the southern margin and to southward compression of the Alxa block on the northern margin has been found. They were the driving forces causing the plateau uplift. The plateau is a continent resulting from amalgamation of eight terranes. These tenanes are separated by sutures or large-scale faults, and different terranes have different lateral inhomogeneities and multi-layered lithospheric structures. At depths of about 20-30 km of the crust in the ulterior of the plateau there commonly exists a low-velocity layer. It is an uncoupled layer of the tectonic stress; above the layer, the upper crustal slices were thrust and overlapped each other and the rocks underwent brittle deformation, thus leading to shortening and thickening of the upper crust Belo  相似文献   

一种基于数据的核优化新方法     

张静  王莉丽  林雪原  杨智勇 《武汉大学学报(信息科学版)》2010,(1)

针对核优化问题进行了研究,给出了一种基于数据的智能核优化新方法。算法利用UCI数据和美国实测合成孔径雷达图像数据进行仿真实验,结果验证了该方法的有效性和可行性。  相似文献   

国际摄影测量与遥感学会(ISPRS)2019地球空间周     

唐学远 《极地研究》2019,31(3):368-369

2019年6月9—14日,国际摄影测量与遥感学会(The International Society for Photogrammetryand Remote Sensing,ISPRS)在荷兰恩斯赫德(Enschede)特文特大学(University of Twente)举行了2019地球空间周(ISPRS Geospatial Week 2019)活动。本次地球空间信息周设有云包映射和地理空间大数据、联合欧洲校准和定位研讨会、行星遥感和测绘、空间数据质量国际研讨会、全球变化研究中的冰冻圈和水圈研讨会(Cryosphere and Hydrosphere for Global Change Studies,CHGCS 2019)、三维地图和导航多传感器系统研讨、高光谱传感符合机器学习和模式分析等专题。  相似文献   

城市下垫面影响空气污染的机制分析          下载免费PDF全文

羊腾跃  刘红年  王学远  胡非 《气象科学》2021,41(6):780-790

本文采用RBLM-chem模式,利用杭州市高分辨率城市建筑等资料,定量分析城市动力效应、热力效应以及城市植被、人为热对SO₂、NO₂、O₃、PM_2.5等主要污染物浓度的影响。结果表明,城市化过程使得大部分城区温度上升约1℃,相对湿度下降约6%,风速下降约0.8 m·s^-1,湍流动能增强约0.03 m²·s^-2。城市动力效应主要通过降低城市风速,使得城区污染物浓度升高,SO₂浓度有近5 μg·m^-3的上升,PM_2.5、O₃浓度也有近15 μg·m^-3的上升。城市热力效应主要通过热岛环流使城区污染物向上输送,令地面污染物浓度降低,在城市大部分区域PM_2.5都有大约10 μg·m^-3的浓度下降。城市动力效应大于热力效应,城市的总体作用是使污染物浓度升高。城市下垫面使污染物浓度上升的另外一个机制是代替了自然有植被的下垫面,使污染物干沉降速度下降,但这一作用小于动力学效应。另一方面,人为热对城市主要污染物浓度都起着减小的作用,其中SO₂、NO₂、O₃、PM_2.5浓度降幅分别在2.5、3.0、6.0、10.0 μg·m^-3左右。城市植被可以显著增加污染物干沉降速度,使主要污染物SO₂、NO₂、O₃和PM_2.5的干沉降速度分别上升0.1、0.1、0.03、0.06 m·s^-1左右,相应地使上述污染物浓度分别下降2.5、6.0、4.0、6.0 μg·m^-3左右。  相似文献