新型组合导航定位技术在机场抢建中的应用     

王何巍  洪勇 《测绘软科学研究》2014,(1):116-119

在机场抢修抢建中,对测量系统的作业时间、定位精度、可靠性具有较高的要求,本文提出了一种新型高精度IMU/TS组合定位导航方法,引入激光跟踪定位/惯性组合导航理念,分析了系统组成以及各传感器的误差项,将系统时间延迟作为新的状态估计参数,采用卡尔曼滤波器将IMU和TS数据进行数据融合处理,并在车载动态应用条件下同IMU/GPS组合定位导航系统进行了实验数据比对,验证了在无GNSS信号环境下IMU/TS组合定位导航系统的位置测量精度。  相似文献   

Assimilating satellite SST/SSH and in-situ T/S profiles with the Localized Weighted Ensemble Kalman Filter     

Meng Shen  Yan Chen  Pinqiang Wang  Weimin Zhang 《海洋学报(英文版)》2022,41(2):26-40

The Localized Weighted Ensemble Kalman Filter(LWEnKF) is a new nonlinear/non-Gaussian data assimilation(DA) method that can effectively alleviate the filter degradation problem faced by particle filtering, and it has great prospects for applications in geophysical models. In terms of operational applications, along-track sea surface height(AT-SSH), swath sea surface temperature(S-SST) and in-situ temperature and salinity(T/S) profiles are assimilated using the LWEnKF in the northern South China ...  相似文献   

Extending Service Life of Household Water Filters by Mixing Metallic Iron with Sand     

Chicgoua Noubactep  Sabine Caré  Fulbert Togue‐Kamga  Angelika Schöner  Paul Woafo 《洁净——土壤、空气、水》2010,38(10):951-959

The use of metallic iron filters (Fe⁰ filters) has been discussed as a promising low‐cost option for safe drinking water production at household level. Filter clogging due to the volumetric expansive nature of iron corrosion has been identified as the major problem of Fe⁰ filters. Mixing Fe⁰ and sand (yielding Fe⁰/sand filters) has been proposed as a tool to extent filter service life. However, no systematic discussion rationalizing Fe⁰/sand mixtures is yet available. This communication theoretically discussed suitable Fe⁰/sand proportions for efficient filters. Results suggested that Fe⁰/sand filters should not contain more that 50 vol% Fe⁰ (25 wt% when Fe⁰ is mixed with quartz). The actual Fe⁰ percentage in a filter will depend on its intrinsic reactivity.  相似文献   

基于区域滤波的GOCE稳态海面动力地形和地转流   总被引：1，自引：0，他引：1       下载免费PDF全文

白希选  闫昊明  朱耀仲  彭鹏 《地球物理学报》2015,58(5):1535-1546

基于频域法,利用最新的GOCE卫星重力场模型和卫星测高数据计算了稳态海面动力地形.结合海洋表层漂流浮标的观测结果,对稳态海面动力地形进行了最优空间滤波尺度分析,给出了区域、纬度带和全球稳态海面动力地形的最优空间滤波尺度因子.在此基础上,给出了全球和区域地转流.结果表明:在中高纬度和全球区域,可以分别获得空间尺度优于102km和127km的稳态海面动力地形信息.与海洋表层漂流浮标对比可知,在强流区域,采用稳态海面动力地形得到的地转流速可以解释观测浮标流速的70%;在中高纬度区域,由GOCE重力场得到的地转流略优于对应的GRACE结果;在近赤道区域,由GOCE重力场得到的地转流精度略低于对应的GRACE结果;在北大西洋和阿古拉斯强流区域,由GOCE得到的地转流场明显优于对应的GRACE结果,其精度分别提高了16%和24%.  相似文献   

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韩厚增  王坚 《大地测量与地球动力学》2013,33(6):98-102

????IAE???????????????????????????ζ????????????????????GNSS/INS??????????????21??????????????????????????????????????в?????????????AUKF???????????????????????????????????????????????????????????????????????????????????????????Ч???δ????????????????????λ?????????49.38%??  相似文献