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| 1 | Performance Analysis of GNSS/MIMU Tight Fusion Positioning Model with Complex Scene Feature Constraints显示文摘In order to meet the requirements of high-precision vehicle positioning in complex scenes,an observation noise adaptive robust GNSS/MIMU tight fusion model based on the gain matrix is proposed considering static zero speed,non-integrity,attitude,and odometer constraint models.In this model,the robust equivalent gain matrix is constructed by the IGG-Ⅲmethod to weaken the influence of gross error,and the on-line adaptive update of observation noise matrix is carried out according to the change of actual observation environment,so as to improve the solution performance of filtering system and realize high-precision position,attitude and velocity measurement when GNSS signal is unlocked.A real test on a road over 600 km demonstrates that,in about 100 km shaded environment,the fixed rate of GNSS ambiguity resolution in the shaded road is 10%higher than that of GNSS only ambiguity resolution.For all the test,the positioning accuracy can reach the centimeter level in an open environment,better than 0.6 m in the tree shaded environment,better than 1.5 m in the three-dimensional traffic environment,and can still maintain a positioning accuracy of 0.1 m within 10 s when the satellite is unlocked in the tunnel scene.The proposal and verification of the algorithm model show that low-cost MIMU equipment can still achieve high-precision positioning when there are scene feature constraints,which can meet the problem of high-precision vehicle navigation and location in the urban complex environment. | Jian WANG Houzeng HAN Fei LIU Xin CHENG | 2021 | Journal of Geodesy and Geoinformation Science2021，4，2： | 6 |
| 2 | 基于改进型ARIMA-GRNN模型的高边坡变形预测显示文摘针对高边坡监测数据的不确定性和实际变形趋势易被强噪声淹没的问题,提出了一种新的基于EEMD-SVD的ARIMA-GRNN模型的预测算法。采用EEMD-SVD对变形数据进行消噪处理,利用ARIMAGRNN模型对非线性变形数据进行预测。通过工程实例对比分析,结果表明:本文模型不仅能较好地滤除观测数据中的低频闪烁噪声和各IMF分量的高频白噪声,还能提高ARIMA-GRNN模型的建模效率,与其他预测模型相比,均方误差、平均绝对误差和平均相对误差均有所下降,且具备较高的精度。 | 段青达 陈天伟 田立佳 郑旭东 陈明 | 2021 | 桂林理工大学学报2021，41，2： | 3 |
| 3 | 地面气象观测数据信息化处理的探讨显示文摘新时期我国科学技术发展水平的提升,为气象行业观测活动开展提供了有效的技术保障。在此背景下,为了实现对地面气象观测数据的高效处理,保持良好处理状况,则需要考虑这类数据的信息化处理,进而提升地面气象观测数据的潜在应用价值,满足气象行业的可持续发展要求。基于此,文章将对地面气象观测数据信息化处理进行系统阐述。 | 范德克 陈景阳 | 2019 | 智能城市2019，5，6： | 0 |
| 4 | 附加历元间约束的滑动窗单频实时精密单点定位算法显示文摘针对同时估计电离层延迟导致的单频精密单点定位解算秩亏问题,提出了一种附加历元间约束的多历元递推算法。该算法根据无周跳时前后历元模糊度不变的特性,在每一组多历元联合数据解算时,每颗卫星只设置一个模糊度参数,不需要外部先验信息约束即可解决秩亏问题。另外,本文算法同时考虑了参数及观测值之间的时间相关性,采用附加约束的平方根信息滤波对部分参数进行历元间约束,克服多历元算法的病态性,提高了算法的可靠性。试验采用全球分布的15个IGS跟踪站14 d的数据,静态定位精度优于3 cm,仿动态解约为1.5 dm。与同时估计电离层延迟的单频PPP方法相比,收敛速度提高了24%,与双频无电离层组合PPP的收敛速度基本一致,定位精度提高了30%,高程分量定位精度提高更为明显。 | 杨凯淳 吕志平 李林阳 邝英才 许炜 郑茜 | 2022 | 测绘学报2022，51，5： | 0 |
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