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L1范数探测粗差失效的观测量识别方法
L1范数估计 粗差探测 条件方程 影响系数
2019/11/25
粗差发生时，L1范数估计求得的条件方程闭合差较最小二乘估计（LS）的残差更能集中反映粗差，从而有助于粗差的发现与定位。然而，存在一类观测值，虽然其具有粗差发现和定位能力，但在采用L1范数估计解决粗差探测问题时，无论含有多大量级粗差都不能准确定位，为叙述方便，称其为L1抗差性失效点（robustness failpoint in L1-norm estimation，RFP-L1）。显然，只有判定测...
GPS L1频点授权信号质量评估
授权信号质量评估 伪码序列估计 功率分配 相关性能
2018/5/21
GNSS信号的空间信号(SIS)质量直接影响用户的定位、测试和授时(Positioning, Velocity and Timing, PVT)服务精度，但由于授权信号保密等原因，授权信号的伪码序列未知，卫星导航系统授权信号质量评估存在一定的困难性。该文主要分析GPS BIIF-5卫星L1频点的相干自适应副载波调制(CASM)信号，利用匹配滤波理论恢复出采集数据中的P(Y)码和M码两个授权信号分量...
针对旋翼飞行器控制过程中存在侧风等外界干扰、飞机本身存在未建模动态等不确定性,提出了一种基于Backstepping L1自适应控制的旋翼飞行器容错控制方法。首先,在不考虑不确定性的情况下,根据旋翼飞行器的动力学方程和运动学方程,利用Lyapunov函数方法设计了基于Backstepping控制的姿态控制律,实现了闭环系统的稳定控制,且响应快速精确。其次,考虑不确定性对系统的影响,在Backste...
采用传统卡尔曼滤波类算法对结构进行损伤识别时，损伤识别反问题的不适定性使得识别结果易受噪声干扰，甚至算法不收敛。为此，该文提出了一种结合l1范数正则化的无迹卡尔曼滤波损伤识别算法。根据结构出现局部损伤时其损伤参数分布具有稀疏性的特点，通过伪测量方法，将l1范数正则化引入到无迹卡尔曼滤波框架中，在改善反问题求解不适定性的同时，能有效地提高结构局部损伤识别能力。梁、桁架结构的数值分析与实验研究表明，该...
基于l1稀疏正则化的信源个数估计新算法
稀疏正则化 信源个数估计 空间平稳噪声 正则化参数
2016/12/3
针对现有信号源个数估计相关算法在低信噪比和较少快拍数下存在欠估计的问题，提出一种适用于空间平稳噪声下基于l1稀疏正则化的信源个数估计新算法。该算法利用信号协方差矩阵特征值分解得到的特征值序列的稀疏性，选取合适的正则化参数对信号源个数进行估计。理论分析和仿真实验表明，所提算法可以在较低信噪比的空间平稳噪声条件下，实现对较少快拍数下阵列接收数据信源个数的精确估计。
基于TV-L1分解的红外云图超分辨率算法
红外云图 非下采样Contourlet变换(NSCT) 图像增强 超分辨率
2016/7/26
提出一种基于TV-L1分解的红外云图超分辨率算法。该方法采用原始-对偶算法求解TV-L1图像分解模型,将低分辨率云图分解为结构部分和纹理部分:对结构部分采用软决策自适应插值(SAI)处理;对纹理部分则基于非下采样Contourlet变换(NSCT)具有多方向和平移不变的特性,构造非线性增益函数对其NSCT变换域系数进行处理,然后对处理后的变换系数进行NSCT逆变换实现纹理增强。最后,将处理后的结构...
An interior point method for large-scale l1-regularized least squares
Sparse signal the compressed sensing signal processing statistics least squares procedure
2015/8/10
Recently, a lot of attention has been paid to l1 regularization based methods for sparse signal reconstruction (e.g., basis pursuit denoising and compressed sensing) and feature selection (e.g., the L...
l1 trend filtering
detrending !1 regularization Hodrick–Prescott fi ltering piecewise linear fitting sparse signal recovery feature selection time series analysis trend estimation
2015/8/10
The problem of estimating underlying trends in time series data arises in a variety of disciplines. In this paper we propose a variation on Hodrick-Prescott (H-P) filtering, a widely used method for t...
AUTOMATIC EXTRACTION OF ALUVIAL FANS FROM ASTER L1 SATELLITE DATA AND A DIGITAL ELEVATION MODEL USING OBJECT-ORIENTED IMAGE ANALYSIS
Remote Sensing Interpretation Geomorphology Knowledge base
2015/7/30
There is a need to automate terrain feature mapping so that to make the process more objective and less time consuming by using
proper feature extraction techniques. The objective of this study was ...
Code Generation Scheme and Property Analysis of Broadcast Galileo L1 and E6 Signals
Code Generation Scheme Broadcast Galileo L1 E6 Signals
2015/6/25
In this paper, we decode the PRN codes of the L1 and E6 signals broadcast by the Galileo GIOVE-A test satellite.We apply the 45.7 m Stanford SRI Dish and the 1.8m dish of the Stanford GNSS Monitor Sys...
Acquisition and Tracking of GIOVE-A Broadcast L1/E5/E6 Signals and Analysis of DME/TACAN Interference on Receiver Design
GIOVE-A Broadcast L1/E5/E6 Signals DME/TACAN Interference Receiver
2015/6/25
This paper demonstrates the tracking and acquisition of GIOVE-A broadcast L1/E5/E6 signals of the Galileo system using a multi-signal all-in-view software receiver. We show that existing aeronautical ...
GPS has launched its first L5 capable satellites and plans to achieve L5 Full Operational Capability (FOC) in the 2019 time frame. L5 is of great interest to the Wide Area Augmentation System (WAAS) a...
Real-Time Dual-Frequency (L1/L5) GPS/WAAS Software Receiver
Real-Time Dual-Frequency (L1/L5) GPS/WAAS Software Receiver
2015/6/24
This paper demonstrates a real-time software receiver supporting GPS/WAAS dual-frequency (L1/L5) processing. The software receiver is implemented on a widely-available recent generation multi-core pro...
L1/L5 SBAS MOPS to Support Multiple Constellations
L1/L5 SBAS MOPS Support Multiple Constellations
2015/6/24
This paper proposes a message structure for the L5 GEO data signal that can support more than 90 simultaneous L1/L5 satellite corrections. The proposal is similar to the existing L1 structure with 250...
L1/L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes
SBAS MOPS Ephemeris Message Multiple Orbit Classes
2015/6/24
New satellite orbits ranging from highly eccentric inclined geosynchronous (IGSO), medium (MEO) to low Earth (LEO) orbits are being proposed for future Global Navigation Satellite Systems (GNSS) and S...