Analysis of a variational Bayesian adaptive cubature Kalman filter tracking loop for high dynamic conditions     

Miao  Zhi-yong  Lv  Yun-long  Xu  Ding-jie  Shen  Feng  Pang  Shun-wan 《GPS Solutions》2017,21(1):111-122

GPS Solutions - Under high dynamic conditions, a robust tracking loop is essential for accuracy positioning with the global position system. In previous studies, the extended Kalman filter...  相似文献   

平湖市地面沉降监测信息管理系统设计与实现     

项志勇  冯杨民  汪建光 《测绘与空间地理信息》2017,(6):156-158

针对地面沉降监测技术的快速发展以及所获取监测成果数据日益丰富,但监测数据的管理手段与展示方式未能及时跟上的现象,研发了平湖市地面沉降监测信息系统。平湖市地面沉降监测系统将数据库技术、数字地图技术、Web电子地图技术相结合,实现对地面沉降监测数据的科学管理和空间信息化展示。  相似文献   

库车前陆盆地白垩系亚格列木组浊流沉积特征与意义   总被引：1，自引：1，他引：0  

高志勇  冯佳睿  安海亭  黄贤营  徐奉学  赵雪松  李小陪 《沉积学报》2013,31(2):237-247

通过对库车前陆盆地西部卡普沙良河剖面上侏罗统喀拉扎组-下白垩统亚格列木组沉积相垂向演化分析、砂泥岩X射线荧光光谱分析、储层微观特征研究,认为喀拉扎组-亚格列木组发育一套干旱气候背景下的陆上季节性辫状河-半深湖浊积扇-浅湖相的沉积演化序列。上侏罗统喀拉扎组主要以季节性辫状河沉积为主,下白垩统亚格列木组下部发育早晚两期浊积扇沉积,浊积扇水道砂体中见槽模、沟模以及重荷模,并发育典型的鲍玛序列,该沉积时期的古气候偏干冷;亚格列木组上部主要发育浅湖相泥岩与沙坝沉积,此沉积时期古气候由湿热变化至干冷。亚格列木组浊积扇水道砂体中石英含量较高,一般介于62%~70%之间,粒间溶孔与构造缝较发育;浅湖相沙坝砂体石英含量降低,一般为55%~58%,沙坝砂体中溶蚀孔较浊积扇中溶蚀孔多。亚格列木组中浊流沉积的发现,不但丰富了库车前陆盆地重力流沉积的研究成果,也表明在早白垩世库车西部发育较深水的沉积环境,为该地区湖相深水沉积的油气勘探奠定了基础。  相似文献   

渝东北双家坝气田黄龙组沉积微相分析     

周永生郑荣才  汪莉彬罗 韧文华国  陈智雍 《中国地质》2013,40(2):508-516

上石炭统黄龙组是渝东北双家坝气田天然气藏的主力产层.依据钻井、岩心、薄片、测井资料,并结合岩石学及古生物等的综合研究,建立了研究区石炭系黄龙组沉积模式.认为双家坝气田黄龙组沉积发育有萨勃哈、海湾陆棚2个沉积相带,具水体逐渐加深和范围向陆上超与扩大的海侵序列.根据沉积相标志又可进一步划分出6个亚相带和8个微相带.依据单井的沉积相研究成果进一步编制了黄龙组一段(C2hl1)、黄龙组二段(C2hl2)、黄龙组三段(C2h23)沉积微相展布图,其中黄龙组二段的复合颗粒滩、砂屑滩、生屑滩微相是本区的有利沉积相带,为双家坝气田石炭系主力产气相带.  相似文献   

深部探测金川预导孔深孔钻探钻头的应用与分析   总被引：1，自引：1，他引：0       下载免费PDF全文

董海燕  欧阳志勇  吴海霞  梁秋萍 《探矿工程》2013,40(9):41-46

在深部探测和科学钻探的施工中,钻头的合理选择和使用是提高深孔硬、脆、碎岩层钻探生产效率的最重要因素之一。针对金川科学钻探深部钻进中的特殊地层岩石进行分析,利用扫描电镜研究钻头中金刚石的分布、包镶和出刃,找出合适的钻头胎体材料和金刚石工艺参数,延长钻头寿命,提高钻探效率。  相似文献   

南阳降水与地质灾害的关系   总被引：1，自引：0，他引：1  

郭志勇温洛  陈燕陈建新  古永保冯起富 《河南气象》2003,(4):29-30

通过对南阳境内地质灾害个例及相对应的降水统计分析，揭示了降水与地质灾害的关系及降水引发地质灾害的原因。  相似文献   

基于植被覆盖度的植被变化分析   总被引：24，自引：0，他引：24  

马志勇  沈涛  张军海  李成名 《测绘通报》2007,(3):45-48

植被覆盖度是衡量地表植被状况的一个最重要的指标,也是影响土壤侵蚀与水土流失的主要因子,对于区域环境变化和监测研究具有重要意义。为了有效地从遥感资料中提取植被覆盖度,以像元线性分解模型两个重要参数为基础,建立基于归一化植被指数(NDVI)进行估算植被覆盖度的模型。最后以杭州地区为实验样区,利用MODIS影像数据对覆盖度进行估算,并对样区的植被变化进行分析。  相似文献   

Rapid-Scan and Polarimetric Phased-Array Radar Observations of a Tornado in the Pearl River Estuary     

张羽  白兰强  孟智勇  陈炳洪  田聪聪  傅佩玲 《热带气象学报(英文版)》2021,27(1):81-86

The strong destructive winds during tornadoes can greatly threaten human life and destroy property. The increasing availability of visual and remote observations, especially by Doppler weather radars, is of great value in understanding tornado formation and issuing warnings to the public. In this study, we present the first documented tornado over water detected by a state-of-the-art dual-polarization phased-array radar (dual-PAR) in China. In contrast to new-generation weather radars, the dual-PAR shows great advantages in tornado detection for its high spatial resolution, reliable polarimetric variables, and rapid-scan strategy. The polarimetric signature of copolar cross-correlation coefficient with anomalously low magnitude appears to be effective for verifying a tornado and thus is helpful for issuing tornado warnings. The Guangdong Meteorological Service has been developing an experimental X-band dual-PAR network in the Pearl River Delta with the goal of deploying at least 40 advanced dual-PARs and other dual-polarization weather radars before 2035. This network is the first quasi-operational X-band dual-PAR network with unprecedented high coverage in the globe. With such high-performance close-range PARs, efficient operational nowcasting and warning services for small-scale, rapidly evolving, and damaging weather (e.g., tornadoes, localized heavy rainfall, microbursts, and hail) can be expected.  相似文献   

山东省地质公园的主要地质遗迹特征   总被引：1，自引：0，他引：1  

王世进  万渝生  徐品  张增奇  姚春梅  杨恩秀  宋志勇  王集宁  蒙永辉  肖为国  任鹏  张岩 《地球学报》2015,36(5):669-684

山东地质遗迹是近30亿年来地质作用过程中形成的地质现象,是重要自然遗产。地质遗迹为探索地球演化进程和方向提供了重要的证据。山东地质公园主要地质遗迹包括地质剖面、地质构造、古生物、矿物与矿床、地貌景观、水体景观、环境地质遗迹景观等七大类。本文叙述了各类地质遗迹的形成时代及分布特征,对各地质公园的主要特征及地层、侵入岩中的主要地质遗迹进行了总结,对地质公园形成演化历史作了介绍,为地质旅游提供了基础资料。  相似文献   

Reynolds and Mass-Damping Effect on Prediction of the Peak Amplitude of A Freely Vibrating Cylinder     

黄智勇  崔维成  刘应中  黄小平 《中国海洋工程》2008,22(1):21-30

The Reynolds effect and mass-damping effect on the peak amplitude of a freely vibrating cylinder is studied by using forced oscillating data from Gopalkrishnan＇ s research in 1993, in which all experimental cases were carried out at a fixed Reynolds and the tested cylinder was recognized as a body that had no mass and damping. However, the Reynolds and roass-damping are the very important parameters for the peak amplitude of a freely vibrating cylinder. In the present study, a function F is introduced to connect the forced oscillation and free vibration. Firstly the peak amplitude AG^＊ can be obtained from the function F using forced oscillation data of Gopalkrishnan＇ s experimental at Re = 10^4, and then the Reynolds effect is taken into account in the function f（Re）, while the mass-damping effect is considered in the function K（ α ）, where a is the mass-damping ratio. So the peak amplitude of a freely vibrating cylinder can be predicted by the expression： A ^＊ = K（ α ）f（ Re ）AG^＊ . It is found that the peak transverse amplitudes predicted by the above equation agree very well with many recent experimental data under both high and low Reynolds conditions while roass-damping varies. Furthermore, it is seen that the Reynolds number does have a great effect on the peak amplitude of a freely vibrating cylinder. The present idea in this paper can be applied as an update in the empirical models that also use forced oscillation data to predict the vortex induced vibration （VIV） response of a long riser in the frequency domain.  相似文献