一种新型非线性滤波理论及其应用     

吴江飞  雷辉  王世忠 《测绘工程》2008,17(6):16-19

研究一种新型的非线性滤波理论,即Unscented卡尔曼滤波（UKF）,同时为了获得更高的计算效率和确保协方差阵的非负定性,研究了平方根UKF。将UKF和平方根UKF应用到星载GPS卫星定轨中,实际算例表明UKF和平方根UKF的性能要优于常用的推广卡尔曼滤波的性能。  相似文献   

Bringing GPS into harsh environments for fully automated deformation monitoring     

Jason Bond  Adam Chrzanowski  Don Kim 《GPS Solutions》2008,12(1):1-11

Engineering projects that require deformation monitoring frequently utilize geodetic sensors to measure displacements of target points located in the deformation zone. In situations where control stations and targets are separated by a kilometer or more, GPS can offer higher precision position updates at more frequent intervals than can normally be achieved using total station technology. For large-scale deformation projects requiring the highest precision, it is therefore advisable to use a combination of the two sensors. In response to the need for high precision, continuous GPS position updates in harsh deformation monitoring environments, a software has been developed that employs triple-differenced carrier-phase measurements in a delayed-state Kalman filter. Two data sets were analyzed to test the capabilities of the software. In the first test, a GPS antenna was displaced using a translation stage to mimic slow deformation. In the second test, data collected at a large open pit mine were processed. It was shown that the delayed-state Kalman filter developed could detect millimeter-level displacements of a GPS antenna. The actual precision attained depends upon the amount of process noise infused at each epoch to accommodate the antenna displacements. Higher process noise values result in quicker detection times, but at the same time increase the noise in the solutions. A slow, 25 mm displacement was detected within 30 min of the full displacement with sigma values in E, N and U of ±10 mm or better. The same displacement could also be detected in less than 5 h with sigma values in E, N and U of ±5 mm or better. The software works best for detecting long period deformations (e.g., 20 mm per day or less) for which sigma values of 1–2 mm are attained in all three solution components. It was also shown that the triple-differenced carrier-phase observation can be used to significantly reduce the effects of residual tropospheric delay that would normally plague double-differenced observations in harsh GPS environments.

Don KimEmail:

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An approach to aid INS using time-differenced GPS carrier phase (TDCP) measurements   总被引：1，自引：0，他引：1  

Ben K. H. Soon  Steve Scheding  Hyung-Kuen Lee  Hung-Kyu Lee  Hugh Durrant-Whyte 《GPS Solutions》2008,12(4):261-271

This paper presents a simple and effective approach that incorporates single-frequency, L1 time-differenced GPS carrier phase (TDCP) measurements without the need of ambiguity resolution techniques and the complexity to accommodate the delayed-state terms. Static trial results are included to illustrate the stochastic characteristics and effectiveness of the TDCP measurements in controlling position error growth. The formulation of the TDCP observation model is also described in a 17-state tightly-coupled GPS/INS iterative, extended Kalman filter (IEKF) approach. Preliminary land vehicle trial results are also presented to illustrate the effectiveness of the TDCP which provides sub-meter positional accuracies when operating for more than 10 min.  相似文献   

经验模式分解的尺度阈值滤波在变形分析中的应用     

余春平  李广云  卫建东  张皓 《测绘科学》2008,33(6):189-191

本文将信号处理领域的经验模式分解算法应用于变形信息的提取中,通过引入阈值函数,建立了基于经验模式分解的尺度阈值滤波模型,采用优化模型确定了经验模式分解的次数。分别通过模拟试验和实测数据与小波阈值法和多项式拟合法进行了比对,分析表明:在低噪声情况下,三种方法都有一定的滤波效果;在高噪声情况下,经验模式分解的尺度阈值滤波法具有与小波阈值去噪法相等的精度,而且瞬时强噪声识别能力更好,优于多项式拟合法。  相似文献   

UKF算法及其在GPS卫星轨道短期预报中的应用     

郑作亚  陈永奇  卢秀山 《武汉大学学报(信息科学版)》2008,33(3):249-252

分析了GPS卫星预报星历,在比较分析EKF和UKF优缺点的基础上,将UKF引入GPS卫星轨道预报研究中.数值模拟和结果分析表明,UKF方法预报更稳定,能有效地提高轨道预报精度和稳定性.  相似文献   

UCD数码相机影像在武汉测区的应用   总被引：2，自引：0，他引：2  

戴腾  张勇  杨华先  陈宏斌 《地理空间信息》2008,6(3):130-132

针对UCD数码航空影像在摄影测量中的空中三角测量和数字测图进行了相关的生产试验。试验结果表明UCD数码航空影像具有较好的成图精度,可以满足大比例尺航测成图的精度指标。根据试验结果对UCD数码影像的生产应用提出了若干建议。  相似文献   

数字海洋地图无缝拼接的研究   总被引：1，自引：0，他引：1  

李晓欢  张雯  别红霞  李学明 《地理空间信息》2008,6(6):58-61

从目前数字海洋地图的现状出发,针对数字海洋地图由分幅存储方式带来的叠幅（图幅间存在重叠区域）和缝隙两个问题,提出了一种无缝拼接的算法。算法可去除图幅之间的重叠区域,并且可以有效去除由分幅导致的缝隙,将多个图幅的图层要素拼接为物理无缝的数据。  相似文献   

全野外数字测图简易编码的数据采集方法   总被引：2，自引：0，他引：2  

刘清田  于庆国 《测绘与空间地理信息》2008,31(1):178-180

全野外数字化测图技术在实际工作中得到了广泛应用,但如何在不增加设备的前提下,提高工作效率,是一个非常现实的问题,本文在结合现有的设备基础上,提出了简易编码测图方案,并对其相关内容进行了阐述。  相似文献   

1∶500,1∶1000,1∶2000系列数字化测绘产品的精度目标与实现     

李云星 《测绘与空间地理信息》2008,(1)

1∶500,1∶1000,1∶2000系列数字化测绘产品按其生产工艺和用途的不同其精度规格也不尽相同,但产品的精度状况始终是测绘生产部门与用户所关心的问题。本文列举了现行有关规范的相关精度指标、规格,并结合产品的用途、特点和测绘生产的实际,简要阐述精度目标的控制与实现过程,对测绘实际工作有一定的参考价值。  相似文献   

基于GIS的个旧花岗岩凹陷带空间信息成矿预测模型     

王雄军  彭省临  杨斌  张建东  梁恩云 《高校地质学报》2008,14(1):106-113

基于GIS技术,对云南个旧花岗岩凹陷带进行数字矿床空间信息成矿预测模型的研究。在了解个旧矿田地质的基础上,通过工作区信息统计单元的划分、预测区地质信息(包括地层、构造、岩浆岩、矿化蚀变以及物、化、遥异常等)变量的确定以及编码和赋值,采用特征分析法确定空间网格单元成矿异常有利度模型,从成矿预测单元中最终圈定了找矿优选靶区。结果表明了信息统计单元结合特征分析数学方法是可行的。  相似文献