抗差卡尔曼滤波模型及其在GPS监测网中的应用   总被引：16，自引：0，他引：16  

余学祥  吕伟才 《测绘学报》2001,30(1):27-31

根据量测向量中的粗差对状态向量滤波值的影响规律，导出了抗差卡尔曼滤波模型，该模型对观测空间和设计空间均具有良好的抗差性。通过对含有粗差的模拟GPS监测网的计算，与标准卡尔曼滤波模型相比较，利用该抗差滤波模型，可获得可靠的变形分析结果。  相似文献   

基于GPS的建筑物变形监测数据处理与系统设计     

边雪清  王玲 《东北测绘》2012,(10):79-81,85

着重介绍了GPS数据的单历元解算方法,以及监测点变形量的分析和预测,探讨了这种方法在变形监测系统数据处理中的应用情况及数据相关性对变形精度的影响。阐述了对变形量进行分析和预测的各种方法,提出用整体方差法对变形量进行分析,并用卡尔曼滤波方法对变形值进行预测,试算结果表明这些方法是可行的。最后,设计了一套GPS自动变形监测系统,包括软件功能设计、数据库实现等,并对系统安全性和可靠性进行了分析。  相似文献   

INSAR干涉图滤波处理     

林卉  杜培军  舒宁  赵长胜 《国土资源遥感》2004,15(3):33-36

合成孔径雷达干涉测量中干涉图的信噪比一般较低,影响了干涉测量产品的精度,因此在后继处理前必须对干涉图作滤波处理。本文在分析干涉图噪声的基础上,探讨了4种有效抑制干涉图噪声的滤波方法。  相似文献   

EMD新技术在数字波形预处理中的初步应用   总被引：2，自引：0，他引：2  

武安绪  林向东  穆会泳  赵桂儒  柴金翼  吴培稚 《华南地震》2006,26(1):133-138

介绍了EMD技术,给出由该技术产生的固有模态函数重构数字地震波形信号处理中所用滤波器算法。然后利用该方法对实际波形信号进行了初步处理,处理结果表明,基于EMD的滤波技术具有许多其它分析手段所不具备的特点,是一种新的滤波方法,可用于数字地震波形信号的预处理。  相似文献   

GS—15型重力仪滤波效能与观测稳定性的对比分析     

杨又陵  蔚晓利 《内陆地震》1998,12(3):215-221

通过观察和模拟干扰源试验,认为红山地震台ＧＳ－１５型重力仪潮汐观测曲线畸变和观测精度氏是因原配ＲＣ滤波电路的抗干扰能力差。用自制的有源贝赛尔滤波电路取代原配ＲＣ滤波电路后,观测质量得到了根本的改善,一系列参量的分析表明,ＧＳ型重力仪弹性系统手换能电路性能优良,有源滤波电路具有很强的抗干扰能力,使用数字记录代替模拟记录可以减小记录系统非线性失真,提高潮汐分析的精度和稳定性。  相似文献   

基于数字地磁资料的滤波幅相法初步应用研究   总被引：2，自引：0，他引：2  

冯志生  张苏平  梅卫萍  居海华  张秀霞  杨从杰 《地震》2006,26(1):93-98

根据地磁垂直分量日变化畸变异常的周期特征, 应用FHD磁力仪分钟值观测资料, 通过富氏拟合滤出1~3 h的日变化,突出垂直分量日变化中的畸变变化, 直接获取了幅相法异常。 新方法只需单台的垂直分量分钟值观测资料, 克服了原有幅相法需要参考台资料的缺陷, 方便了异常提取, 拓展了数字地磁观测资料的应用范围。  相似文献   

"0808"号台风残留引发特大暴雨成因分析   总被引：6，自引：6，他引：0  

谢义明  胡玉玲  沙维茹  朱建国  杨柳 《气象科学》2011,31(1):61-66

利用多普勒雷达、TBB和NCEP1×1°再分析资料,对2008年8月1日发生在苏皖中部交界处的特大暴雨过程进行了分析.结果表明:特大暴雨过程是发生在减弱后的"0808"号台风环流与增强的副热带高压相互作用的背景下,西南低空急流增强和台风环流蜕变低槽东移分别触发了两段强降水的发生,对流层中低层强水汽辐合上升激发了台风残留...  相似文献   

江苏省测震台网井下地震计方位角检测     

宫杰  张朋  张扬  张敏  王佳  居海华 《震灾防御技术》2022,17(1):181-187

为获取江苏省测震台网井下地震计精确方位角,架设地面参考地震计,将其精确指北,并与井下地震计检测结果进行对比,利用相关分析法计算22个深井台站精度较高的方位角。研究结果表明,受多因素制约,井下地震计检测结果普遍偏差较大,部分台站水平向分量几乎反向,如提井,需重新进行方位角检测;地面与井下地震计同频带有利于提高相关性,从而获取高精度检测结果;利用不同频带地震计进行井下地震计方位角检测时,对较宽频带地震计进行仿真处理尤为重要;溧阳2台站新建井下地震计检测结果表明相关分析法可应用于井下地震计方位角检测;尽可能选择台基噪声功率谱密度曲线具有明显波峰频段作为滤波频段,有利于提高地面与井下地震计观测数据相关性,提高方位角检测精度。  相似文献   

Filtering airborne LiDAR data by embedding smoothness-constrained segmentation in progressive TIN densification     

《ISPRS Journal of Photogrammetry and Remote Sensing》2013

Progressive TIN densification (PTD) is one of the classic methods for filtering airborne LiDAR point clouds. However, it may fail to preserve ground measurements in areas with steep terrain. A method is proposed to improve the PTD using a point cloud segmentation method, namely segmentation using smoothness constraint (SUSC). The classic PTD has two core steps. The first is selecting seed points and constructing the initial TIN. The second is an iterative densification of the TIN. Our main improvement is embedding the SUSC between these two steps. Specifically, after selecting the lowest points in each grid cell as initial ground seed points, SUSC is employed to expand the set of ground seed points as many as possible, as this can identify more ground seed points for the subsequent densification of the TIN-based terrain model. Seven datasets of ISPRS Working Group III/3 are utilized to test our proposed algorithm and the classic PTD. Experimental results suggest that, compared with the PTD, the proposed method is capable of preserving discontinuities of landscapes and reducing the omission errors and total errors by approximately 10% and 6% respectively, which would significantly decrease the cost of the manual operation required for correcting the result in post-processing.  相似文献   

Diversity in Knoxville: An applied perspective     

《Applied geography (Sevenoaks, England)》2013

This study contributes to the literature on applied urban geography by examining spatial patterns and processes of changing racial/ethnic diversity within the intra-urban context of Knoxville metropolitan statistical area. Knoxville embraces a diverse economic set up with opportunities in high-tech research and development, manufacturing, tertiary/service-sectors, construction, as well as entertainment industry. This serves well for its continued population growth, including minorities during 1990–2009. This paper explores how the neighborhood-level socioeconomic, demographic, and built-environment characteristics relate to tract-level racial/ethnic diversity, measured by multi-group diversity score and its components. Tools such as isarithmic surface density maps, correlations, principal components and regression analyses are used to examine processes of change. Results indicate that diversity in 1990 associates with negative change whereas diversity in 2000 associates with positive change. Though overall diversity sprawls and increases during 1990–2009, diversity among non-White declines during 2000–2009 and shows spatial confinement. Regressions suggest complicated mosaics of changing neighborhoods, providing evidence of invasion-succession, filtering and resurgence of ethnic-enclaves in specific neighborhoods. Concerning the six counties of the MSA, Knox is the most diverse whereas Union the least, though the share of Hispanics tops in Loudon and Asians in Knox. In terms of strategic planning, findings from this research can be used in creating equitable and sustainable urban communities that can improve the overall well-being of people by reducing racial/ethnic and socio-economic disparities that might occur as undesirable consequences of fast increasing diversity.  相似文献