检索结果-内蒙古大学图书馆

Statistical comparison of various interpolation algorithms for reconstructing regional grid ionospheric maps over China

引用

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 2018年 172卷 129-137页

作者： Li, Min Yuan, Yunbin Wang, Ningbo Li, Zishen Liu, Xifeng Zhang, Xiao Inst Geodesy & Geophys State Key Lab Geodesy & Earths Dynam Wuhan Hubei Peoples R China Univ Chinese Acad Sci Beijing Peoples R China Chinese Acad Sci Acad Optoelect Beijing Peoples R China Henan Polytech Univ Jiaozuo Peoples R China

This paper presents a quantitative comparison of several widely used interpolation algorithms, i.e., Ordinary Kriging (OrK), Universal Kriging (UnK), planar fit and Inverse Distance Weighting (IDW), based on a grid-based single-shell ionosphere model over China. The experimental data were collected from the Crustal Movement Observation Network of China (CMONOC) and the International GNSS Service (IGS), covering the days of year 60-90 in 2015. The quality of these interpolation algorithms was assessed by cross-validation in terms of both the ionospheric correction performance and Single-Frequency (SF) Precise Point Positioning (PPP) accuracy on an epoch-by-epoch basis. The results indicate that the interpolation models perform better at mid-latitudes than low latitudes. For the China region, the performance of OrK and UnK is relatively better than the planar fit and IDW model for estimating ionospheric delay and positioning. In addition, the computational efficiencies of the IDW and planar fit models are better than those of OrK and UnK.

关键词： Total electron content (TEC) Regional grid ionospheric map interpolation algorithms Ionospheric

来源：评论

学校读者我要写书评

暂无评论

Added value of merging techniques in precipitation estimates relative to gauge-interpolation algorithms of varying complexity

引用

JOURNAL OF HYDROLOGY 2024年 645卷

作者： Hu, Yingyi Zhang, Ling Chinese Acad Sci Northwest Inst Ecoenvironm & Resources Key Lab Cryospher Sci & Frozen Soil Engn Heihe Remote Sensing Expt Res Stn Lanzhou 730000 Peoples R China Jiangsu Ocean Univ Sch Marine Technol & Geomat Lianyungang 222005 Jiangsu Peoples R China

Data-fusion techniques leverage the strengths of multisource precipitation data and can significantly enhance the accuracy of precipitation estimates. However, the extent to which these techniques improve precipitation estimates (i.e., added value) compared to interpolation algorithms and the factors driving this improvement remain unclear. To address these gaps, this study compared the performance of two merging techniques, i.e., double machine learning (DML) and geographically weighted regression (GWR), with multiple interpolation algorithms in estimating precipitation across China. The interpolation algorithms vary in complexity and include typical methods (IDW and Kriging), semi-physical methods (GIDS, DAYMET, and MicroMet), and climatologically aided interpolation (CAI). We quantified the added value of the merging techniques over these interpolation algorithms and investigated the driving factors using a data-driven approach. Results indicate that the merging techniques outperform all the interpolation algorithms, regardless of their complexity. The merging techniques provide greater added value in gauge-scarce regions (e.g., Northeast China) than in gauge-rich regions (e.g., Northwest China). The magnitude of the added value from merging techniques is significantly influenced by the choice of interpolation algorithms due to their varying performance. Additionally, our data-driven model reveals that factors such as the amount of precipitation, number of wet days, performance of precipitation products, and gauge density are key drivers that negatively affect the added value of merging techniques. This study highlights the importance of integrating multisource data to improve precipitation estimates, especially in regions with sparse gauges, rather than relying solely on gauge-only interpolation.

关键词： Merging techniques interpolation algorithms Added value Machine learning Precipitation estimates China

来源：评论

学校读者我要写书评

暂无评论

Reduction of deformations of the digital terrain model by merging interpolation algorithms

引用

COMPUTERS & GEOSCIENCES 2014年 64卷 61-71页

作者： Gosciewski, Dariusz Univ Warmia & Mazury Fac Geodesy & Land Management Inst Geodesy PL-10957 Olsztyn Poland

Majority of contemporary spatial information systems allow generation and visualization of the digital terrain model based on GRID type of the regular squares network. The values at nodal points for such a GRID are in most cases computed by one of the many available interpolation methods on the basis of dispersed measurement points. The commonly used solutions allow in most cases application of a selected interpolation method in a global way within the entire analyzed area, which does not secure the same accuracy of surface generated. The paper describes generation of a digital terrain model by applying a combination of interpolation methods. The criterion of method choice was dependent on the dispersion of measurement points around the GRID node. This solution allows successive complementing the resultant set of computed set with values determined with a specific error and as a result improves the accuracy of the model generated. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： GIS Digital terrain model Regular GRID structure interpolation algorithms Large observation sets

来源：评论

学校读者我要写书评

暂无评论

Windows and interpolation algorithms for correcting frequency offset in OFDM

引用

ELECTRONICS LETTERS 1999年第21期35卷 1868-1869页

作者： Zhang, R Tjhung, TT He, P Natl Univ Singapore Dept Elect Engn Singapore 119260 Singapore Natl Univ Singapore Ctr Wireless Commun Singapore 119260 Singapore

An efficient DFT-based frequency offset estimation technique is presented for orthogonal frequency division multiplexing (OFDM) digital communication systems. The performance of the proposed scheme is confirmed by com... 详细信息

关键词： orthogonal frequency division multiplexing Integral transforms in numerical analysis frequency offset OFDM QAM signals class I Vincent windows interpolation and function approximation (numerical analysis) Modulation and coding methods Communication switching digital communication discrete Fourier transforms OFDM modulation quadrature amplitude modulation interpolation algorithms computer simulation interpolation DFT-based frequency offset estimation digital communication systems class I Rife windows

来源：评论

学校读者我要写书评

暂无评论

Estimation of the Frequency Vector of a Two-Dimensional Harmonic Signal using Three-Point interpolation algorithms and Singular Value Decomposition

引用

OPTOELECTRONICS INSTRUMENTATION AND DATA PROCESSING 2017年第3期53卷 210-215页

作者： Gruzman, I. S. Novosibirsk State Tech Univ Pr Karla Marksa 20 Novosibirsk 630073 Russia

Computationally simple algorithms are proposed to estimate the local frequency vector of a real two-dimensional signal with slowly varying parameters in the presence of additive Gaussian noise. The rough most likely estimate of the frequency vector is refined using three-point interpolation algorithms and the singular value decomposition of a 3 x 3 matrix of discrete Fourier transform coefficients. The results of computer simulation are presented showing the efficiency of the algorithms for analyzed fragments of small size.

关键词： frequency estimation two-dimensional real signal interpolation algorithms discrete Fourier transform coefficients singular value decomposition of matrices

来源：评论

学校读者我要写书评

暂无评论

The study of interpolation algorithms in OFDM Systems

The study of Interpolation Algorithms in OFDM Systems

引用

International Conference on Mechatronics and Industrial Informatics (ICMII 2013)

作者： Zhang, Xijun Xue, Jianbin Lin, Ying He, Jiai Lanzhou Univ Technol Lanzhou Peoples R China

ISBN: (纸本)9783037856949

Orthogonal frequency division multiplexing (OFDM) is a kind of highly transmission technology. It has been taken more and more attention in many ways. In this paper it mainly discussed the simulation process and several interpolation algorithms in OFDM system. Using computer we simulate the interpolation algorithms in OFDM channel estimation. Through the simulation results we compare the advantage and disadvantage of the interpolation algorithms. At last we can use the conclusion to choose the correct interpolation algorithms in OFDM channel estimation.

关键词： OFDM interpolation algorithms estimation

来源：评论

学校读者我要写书评

暂无评论

Iterative Sine-Wave Frequency Estimation by Generalized Fourier interpolation algorithms 11

Iterative Sine-Wave Frequency Estimation by Generalized Four...

引用

11th International Symposium on Electronics and Telecommunications (ISETC)

作者： Belega, Daniel Petri, Dario Dallet, Dominique Politehn Univ Timisoara Dept Measurements & Opt Elect Timisoara Romania Univ Trento Dept Ind Engn Trento Italy Univ Bordeaux MATMECA IMS Lab IPB ENSEIRB Talence France

ISBN: (纸本)9781479972678

In this paper two iterative interpolation algorithms proposed in the scientific literature for estimating the frequency of complex-valued sine-waves are generalized to a generic Maximum Sidelobe Decay (MSD) window in order to achieve highly accurate estimates even when real-valued pure or harmonically distorted sine-waves are analyzed. The analytical expressions for the frequency estimations formulas are derived. Moreover the accuracy achieved when pure, noisy, and noisy and harmonically distorted sine-waves are analyzed is compared with those provided by the classical Interpolated Discrete Fourier Transform (IpDFT) and three-point IpDFT algorithms through computer simulations. The performed comparison allows us to determine in which situations the proposed algorithms can be advantageously used.

关键词： Frequency estimation interpolation algorithms sine-wave uncertainy analysis windowing

来源：评论

学校读者我要写书评

暂无评论

A Comparison of interpolation algorithms for Gramophone Record Sound Reconstruction

A Comparison of Interpolation Algorithms for Gramophone Reco...

引用

1st International Conference on Signal Processing and Integrated Networks (SPIN)

作者： Stallmann, Christoph F. Engelbrecht, Andries P. Univ Pretoria Dept Comp Sci ZA-0002 Pretoria South Africa

ISBN: (纸本)9781479928668

Gramophone records were the main recording medium for half a century and regained widespread popularity over the past couple of years. Being an analogue storage medium, vinyl records are subject to distortions caused by scratches, dust, high temperatures and extensive playback. This paper discusses a number of well-known interpolation algorithms that can be used to reduce the noise by reconstructing the distorted gaps, which include the nearest neighbour, cosine, polynomial, spline, Hermite and Fourier interpolation. The reconstruction accuracy of these algorithms were determined by using a large dataset of songs from eight different music genres. It was found that cosine and polynomial interpolation have the best mean performance with regards to reconstruction accuracy and execution time. It was also found that certain genres can be easier reconstructed than others.

关键词： audio recording audio signal processing interpolation music polynomial approximation signal reconstruction splines (mathematics) Fourier interpolation Hermite interpolation analogue storage media cosine interpolation distorted gap reconstruction gramophone record sound reconstruction interpolation algorithms music genre nearest neighbour noise reduction polynomial interpolation recording media spline interpolation vinyl records Accuracy interpolation Mathematical model Nickel Polynomials Silicon Splines (mathematics)

来源：评论

学校读者我要写书评

暂无评论

Two Dimensional Autoregressive Modeling-Based interpolation algorithms for Image Super-resolution: A Comparison Study 10

Two Dimensional Autoregressive Modeling-Based Interpolation ...

引用

10th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Lu, Meiyun Huang, Liqing Xia, Youshen Fuzhou Univ Coll Math & Comp Sci Fuzhou Fujian Peoples R China

ISBN: (纸本)9781538619377

Image interpolation is a key technique of image super-resolution. Four two dimensional (2-D) autoregressive (AR) modeling-based image interpolation algorithms have been reported to have better performance in edge and texture preservation than conventional image polynomial interpolation algorithms. However, there is lack of performance comparison among them. For super-resolution reconstruction quality, this paper is going to fill up the gap by a comparison study on the four 2-D AR modeling-based interpolation methods: novel edge-directed interpolation (NEDI), soft-decision adaptive interpolation (SAI), sparse representation interpolation with nonlocal autoregressive modeling (SR-NARM), and adaptive super-pixel-guided AR modeling (ASARM). Furthermore, the four interpolation algorithms are compared in the light of peak signal to noise ratio, feature similarity index, mean squared error and structural similarity index. From comparative results we observe that ASARM method has relatively better performance than other three methods but is more time-consuming than the NEDI and SAI methods.

关键词： image super-resolution interpolation algorithms autoregressive modeling comparative analysis

来源：评论

学校读者我要写书评

暂无评论

algorithms of interpolation of Quadrature Signals for High-Resolution Encoders of Linear and Angular Displacements

引用

OPTOELECTRONICS INSTRUMENTATION AND DATA PROCESSING 2019年第1期55卷 52-58页

作者： Kiryanov, A. V. Kiryanov, V. P. Chukanov, V. V. Russian Acad Sci Inst Automat & Electrometry Siberian Branch Pr Akad Koptyuga 1 Novosibirsk 630090 Russia

Capabilities of some algorithms of interpolation of quadrature signals currently used for creating parallel-type interface modules for high-resolution encoders of linear and angular displacements are analyzed.

关键词： interpolation algorithms interface modules photoelectric angular encoders photoelectric linear encoders absolute and incremental encoders

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：