一种新的混合迭代UKF     

常国宾  许江宁  胡柏青  纪兵 《武汉大学学报(信息科学版)》2012,37(6):701-703

从统计线性回归的角度对无味变换(unscented transformation,UT)进行分析,推导了迭代无味卡尔曼滤波(iterated unscented Kalman filter,IUKF)。针对IUKF计算量大的问题,结合弦线迭代法和IUKF,得到了一种新的混合迭代无味卡尔曼滤波器。数值仿真的结果表明,新滤波算法的精度优于扩展卡尔曼滤波、迭代扩展卡尔曼滤波和无味卡尔曼滤波,并可以有效降低IUKF的计算量。  相似文献   

影响莫高窟小气候的环境因子对比分析   总被引：2，自引：0，他引：2  

李红寿  汪万福  张国彬  邱飞  詹洪涛 《干旱气象》2008,26(2):25-30

应用不同时空尺度对莫高窟的小气候进行对比分析,发现莫高窟的地形地貌、水系统、植被等环境因子对其小气候有重要影响。莫高窟的小地形结构和水系统对其风速、湿度、太阳辐射等有显著影响。2005年4—12月窟前与窟顶月平均相比,太阳辐射总量降低411．21MJ／m^2,地表温度降低2．7℃,相对湿度增大9％,风速降低3．7m／s。窟前月较差小于戈壁0．9℃。但对于气温而言,主要受较大尺度因素的控制,窟前、窟顶、戈壁均处于同一温度层。2004年莫高窟日较差比敦煌小4．8℃。莫高窟的环境因子使莫高窟周边形成了更为稳定的小气候,非常有利于文物保护,这也是千年莫高窟保存至今的一个重要原因。  相似文献   

Evaluation of various root transformations of daily precipitation amounts fitted with a normal distribution for Australia     

Guobin Fu  Neil R. Viney  Stephen P. Charles 《Theoretical and Applied Climatology》2010,99(1-2):229-238

This paper evaluates the various root transformations (2/3, 7/12, 1/2, 5/12, 1/3, and 1/4) of daily precipitation amounts fitted with a truncated normal distribution model for 189 stations across Australia. The results indicate that all stations used in this study can be identified to have a specific root transformation resulting in a “good” fit with a normal distribution and the minimum correlation coefficients (r) fitted with a normal distribution is 0.9925. The 5/12 power transformation leads to the “best” fit with a normal distribution in 47% of stations across Australia. This conclusion could extend the applications of many statistical testing techniques and methods on daily precipitation studies.  相似文献   

基于AVHRR的地市级火情监测分析与应用     

王福州  郭魁英  王国斌  石俊峰  孙仲毅  李喜平  孙日丁 《气象》2006,32(10):112-116

以DVB-S下发的气象卫星AVHRR遥感资料为基础,根据下垫面性质把鹤壁分成不同火点判识子区,通过对卫星火点监测资料和实际火点资料统计对比分析,确定每一子区不同时次的精细门槛值,并利用1∶5×104大比例尺行政数据集对火点进行精确定位,在鹤壁地区2004和2005年秸秆焚烧监测应用中取得了良好效果,为政府部门及时准确掌握全市秸秆焚烧情况,提高火情监测能力和监督检查效率提供了重要科学依据。  相似文献   

Urban Open Space Study Based on Remote Sensing and Geographic Information Systems     

ZHUGuobin 《地球空间信息科学学报》2003,6(3):76-78

  相似文献   

沪蓉公路高坪至吉心段工程地质及不良地质问题对策   总被引：1，自引：0，他引：1  

王国斌  邓长青  王云安 《山地学报》2004,22(3):340-342

沪蓉国道主干线湖北省宜昌至恩施公路高坪-吉心段路线走廊带地处云贵高原之东北部边缘的"鄂西高原",属武陵山、大娄山、八面山的余脉,为中低山-低中山地形,地面高程多在500m以上,地形复杂,路基工程地质条件复杂多变,不良地质现象发育,尤其是喀斯特工程地质问题突出。介绍该线路区工程地质状况,探讨不良地质问题的对策。  相似文献   

The change in values for ecological footprint indices following land-use change in a Loess Plateau watershed in China     

Ping Zhou  Guobin Liu 《Environmental Earth Sciences》2009,59(3):529-536

Sustainability was defined as the continuous support of human quality of life within a region’s ecological carrying capacity. Ecological footprint was a quantitatively measuring indicator to analyze the sustainable use of natural resources and had been widely used to evaluate whether the development of a certain region was within the range of the capacity of natural ecosystem. In the present study, production data, consumption data and statistics communique of Zhifanggou watershed were analyzed to determine per capita ecological footprint, biological carrying capacity and related indices. On the basis of theory a model was applied that showed the biologically productive land area required by a defined population—ecological footprint model before and after grain for green policy. Result showed that after introducing the grain for green policy, per capita ecological footprint was reduced from 0.733 to 0.650 hm² cap⁻¹ and biological capacity was increased from 1.559 to 1.567 hm² cap⁻¹. There was a surplus of ecosystem resources both before and after the grain for green policy and this increased as a result of the policy. The related ecological footprint indices analysis showed that 10,000 RMB of GDP of ecological footprint was reduced, but ecological efficiency, ecological footprint index, bio-diversity of ecological footprint and system development ability increased Results demonstrated that conditions in this watershed improved and development potential was enhanced. Meanwhile, the sensitive index of forestland was strengthened more than other biological productive areas after introducing the policy. In adjusting and improving the land use structure created a resource-saving mode, forming resource-saving increase mode gradually, and triggering sustained consumption which will improve the ecological environment of zhifanggou watershed in the future.  相似文献   

小流域生态经济系统可持续发展评价 --以东北低山丘陵区黑牛河小流域为例   总被引：24，自引：0，他引：24  

戴全厚  刘国彬  刘明义  王跃邦  WANG Yuebang 《地理学报》2005,60(2):209-218

以黑牛河小流域为例,在详细分析东北低山丘陵区小流域可持续发展现状的基础上,对该小流域的可持续发展状况进行定量评价：从效益显著性、资源与环境可支撑性和系统运行稳定性3个方面,选择31个因素作为参评因子,建立评价指标体系;采用精度较高的均方差法确定指标权重,以消除人为经验主观判断,提高评价的客观性和准确率;运用递阶多层次综合法建立二级层次指标(效益显著性、资源与环境可支撑性和系统运行稳定性)评价模型,多目标线性加权函数法建立流域系统综合评价模型,评判出了该区小流域的二级层次指标和综合指标的可持续发展水平,并有针对性的提出了小流域可持续发展的具体对策和建议。  相似文献   

汶川8.0级地震宁夏前兆异常回顾与同震响应特征分析          下载免费PDF全文

王晓涛  马禾青  崔瑾  李国斌  丁风和 《地震工程学报》2022,44(1):192-202

对2008年5月12日四川汶川8.0级地震前宁夏地区出现的前兆观测异常进行回溯性分析,从大地震的孕育范围与地震前兆的发展阶段分析认为这些观测异常可能与汶川8.0级地震有关.宁夏地区数字化流体与形变观测资料出现了不同程度的同震响应变化,对比分析其同震响应特征,结果显示宁夏地区前兆观测对汶川8.0级地震表现出南北分区特征....  相似文献   

小口子重力观测疑似“异常”的落实与体会     

李国斌  郭宏斌  延海军  安玉清  何秋菊  訾绍刚 《高原地震》2012,24(1):64-67

2011年4月18日开始,银川地震台小口子重力观测出现毛刺、抖动等变化,通过对观测环境、观测线路、观测仪器的排查,最终排除了由于观测信号线故障所导致的变化,有效地解决了观测中出现的复杂问题,加深了观测人员、分析人员对前兆观测异常的判断与认识。  相似文献