Research on Multi-satellites Fusion Inversion Model of Soil Moisture Based on Sliding Window

来源 :第九届中国卫星导航学术年会 | 被引量 : 0次 | 上传用户:uuuuuuuu
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
  Global Positioning System Interferometric Reflectometry(GPS-IR)is a new remote sensing technique,and it can be used to estimate near surface soil moisture from signal-to-noise ratio data.Considering the advantages of multi-satellite convergence and the time and space scale of soil moisture,a multi-satellites fusion inversion model of soil moisture based on sliding window is proposed.
其他文献
The development of multi-GNSS remarkably increased the number of available satellites,but how to solve the multi-dimensional ambiguity parameters quickly and accurately in network RTK technology is st
Positioning precision of navigation satellite system can be measured by two indicators: the dilution of precision(DOP)and the user equivalent range error(UERE).As the DOP values are only related to th
Dual Estimation Technique(DET)is mainly used to achieve unambiguous tracking of high-order BOC signals.DET has a good tracking performance,but its anti-multipath performance need to be further improve
Due to the non-ideal characteristics of navigation satellite signals,pseudo-range observations of two satellites for the same signal are different in the same receiver,in addition to that,for zero-bas
The adaptive beam-forming technique based on array antennas is an effective countermeasure towards suppressive interferences.However,it will induce distortions to the desired satellite signal,leading
发射阵地上空扰动引力对弹道导弹主动段飞行影响很大.通过使用基于SRTM数据的地形分类,计算了七种地形类别的纬向、经向和径向扰动引力,并对弹道扰动引力进行了分析和比较.经过计算,在近地表各地形扰动引力三分量均与平原相差很大;而弹道高度大于25km时,扰动引力偏差逐步收敛甚至趋向于0.这表明扰动引力对导弹低空主动段影响很大,高空高速飞行时影响不大,发射点位于我国多山或青藏高原地区,扰动引力对导弹落点影
由于智能手机扫描Wi-Fi信号消耗过多的电量,因此基于智能手机进行长时间室内定位提出了挑战.本文提出了一种结合惯性传感器和楼层平面图的混合定位方法.惯性定位系统积分加速度和角速度获得行人的相对位移.由于惯性传感器的偏差、非正交性以及用户抖动,惯性定位系统的主要问题是方向漂移.惯性定位误差随着时间进行没有边界的增长.考虑到用户不能越过墙壁等障碍物,我们提出了基于楼层平面图的粒子滤波来修正惯性定位系统
在运载器目标飞行过程中,测距测量元素是获取高精度弹道结果的重要测量信息,具有观测误差源少、测量精度高等特点.针对相同观测弧段多颗卫星GPS伪距测元,建立了基于总体最小二乘算法的融合定位方法,将观测方程线性化,构造系数矩阵与观测向量的增广矩阵,依托奇异值分解理论确定弹道融合定位结果.与最小二乘算法相比,该算法除了考虑测量信息误差,还同时考虑了系数矩阵可能带来的误差,且计算过程中无需迭代和给出准确的弹
视觉导航定位精度与载体动态联系紧密,针对视觉导航在高动态条件下导航精度问题,对比、分析了视觉导航系统在低动态以及高动态场景下的导航定位精度.提出了以视觉导航对传统INS/GNSS组合导航进行辅助的系统,给出了联邦滤波系统的状态模型及量测模型,将新系统在以上场景下的定位结果与单一视觉导航系统以及INS/视觉组合导航系统进行对比.仿真结果表明,与单一系统相比,视觉导航辅助的INS/GNSS组合系统能够
It is very important to get precise positioning information continuously in the UAV RTK.However,the complex environment often degrades the observation quality or even introduces several gross errors w