Measurement Science and Technology最新文献_第8页

ConvGRU-MHM: A CNN GRU-enhanced MHM for mitigating GNSS multipath ConvGRU-MHM：用于减缓全球导航卫星系统多径的 CNN GRU 增强型 MHM

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-28 DOI: 10.1088/1361-6501/ad1978

Runfa Tong, Chao Liu, Yuan Tao, Xiangyang Wang, Jingqiang Sun

{"title":"ConvGRU-MHM: A CNN GRU-enhanced MHM for mitigating GNSS multipath","authors":"Runfa Tong, Chao Liu, Yuan Tao, Xiangyang Wang, Jingqiang Sun","doi":"10.1088/1361-6501/ad1978","DOIUrl":"https://doi.org/10.1088/1361-6501/ad1978","url":null,"abstract":"In high-precision global navigation satellite system (GNSS) short-baseline positioning, multipath is the main source of errors. If the station environment is quasi-static, repeat periods of satellites can be utilized to generate time- or space-dependent multipath models to mitigate multipaths. However, two general problems are associated with the multipath models constructed based on satellite mechanics: (1) an accuracy decrease occurs when the above models are applied to multipath mitigation over a long time-span; (2) when constructing the spatial and temporal grids of the satellite-based spatially dependent multipath model, it is challenging to balance computational efficiency and spatial resolution. We propose a convolutional neural network-gated recurrent unit enhanced multipath hemispherical map (ConvGRU-MHM) in the observational domain to address these problems. The proposed method directly mines the deep features of elevation, azimuth angle, and multipath and the mapping relationship between these to establish a real-time prediction model. The predicted multipath is obtained and returned to the observation equation for multipath mitigation when the real-time position of the satellite is placed in the pre-trained model. We compared the multipath mitigation performance of sidereal filtering (SF) and a multipath hemispherical map (MHM) with that of the ConvGRU-MHM to demonstrate the advantages of the proposed method. The experimental results are as follows: (1) in the short time-span (first 20 days), the mean accuracy improvements of the ConvGRU-MHM in the E/N/U direction performed better than those of the SF and MHM; and (2) in the long-term time (after 50 days), the mean accuracy improvements of the ConvGRU-MHM in the E/N/U direction are higher than that of the SF and MHM by 10–20%. As a lightweight model, the ConvGRU-MHM can effectively improve the measurement accuracy of GNSS real-time monitoring in fields, such as deformation monitoring and seismic research.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"66 s94","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139150291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simple tracking of occluded self-propelled organisms 隐蔽自走生物的简单追踪

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-28 DOI: 10.1088/1361-6501/ad1813

D. Noto, H. Ulloa

引用次数: 0

Recent progress in angle-resolved photoemission spectroscopy 角分辨光谱学研究进展

3区工程技术

Measurement Science and Technology Pub Date : 2023-12-27 DOI: 10.1088/1361-6501/ad1915

Yang Wang, Maciej Dendzik

引用次数: 4

A New Selection Method of Singular Values Using Correlation Coeﬃcient for Weak Exponential Damped Sinusoidal Signal Detection under Strong Noise 强噪声下利用相关系数检测弱指数阻尼正弦信号奇异值的新方法

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-27 DOI: 10.1088/1361-6501/ad191e

Ting Zhang

{"title":"A New Selection Method of Singular Values Using Correlation Coeﬃcient for Weak Exponential Damped Sinusoidal Signal Detection under Strong Noise","authors":"Ting Zhang","doi":"10.1088/1361-6501/ad191e","DOIUrl":"https://doi.org/10.1088/1361-6501/ad191e","url":null,"abstract":"Weak signal detection has attracted considerable attention in a wide range of research fields, especially the weak signal detection under strong noise is an urgent problem researches are concerned with. In this paper, a new criterion to select singular values using correlation coefficient is proposed for weak exponential damped sinusoidal signal detection, which has a wide variety of signal processing applications. The innovation of our method lies in selecting K most informative singular values rather than the most energetic singular values. The proposed method measures the similarity between component signals and useful signal through autocorrelation function and correlation coefficient, which can preserve more information of the original signal and be more suitable for weak signal detection scenarios under strong noise. The numerical experiments and analysis are performed to verify the efficiency and effectiveness of our method, which indicates the proposed method is superior to the singular value selection methods based on energy or simple difference principle for correlation coefficients. Compared with stochastic resonance methods suitable for weak signal detection under strong background noise, our proposed method also has significant advantages. Thus, the proposed method is beneficial to theoretical analysis and engineering applications.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"18 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139153400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bearing fault feature extraction method: Stochastic resonance-based negative entropy of square envelope spectrum 轴承故障特征提取方法：基于随机共振的方形包络谱负熵

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-22 DOI: 10.1088/1361-6501/ad1872

Haixin Zhao, Xiao-Qiang Jiang, Bo Wang, Xueyu Chen

{"title":"Bearing fault feature extraction method: Stochastic resonance-based negative entropy of square envelope spectrum","authors":"Haixin Zhao, Xiao-Qiang Jiang, Bo Wang, Xueyu Chen","doi":"10.1088/1361-6501/ad1872","DOIUrl":"https://doi.org/10.1088/1361-6501/ad1872","url":null,"abstract":"The early identification of bearing defects has recently attracted increasing attention in the fields of condition monitoring and predictive maintenance because of the critical role of bearings on the reliability and safety of turbomachines. The weak features representing early faults in the vibration signals are often submerged in the environmental noise, which poses a major challenge for the early fault diagnosis of rolling bearings. This study proposes a negative entropy of the square envelope spectrum approach integrated with optimized stochastic resonance-based signal enhancement for accurate early defect detection of rolling element bearings. The proposed method considers the cyclostationarity and impulsivity of the raw signal, as well as its similarity with the enhanced signal, thus reinforcing the characteristic frequency while integrating the regularity of the raw signal to evaluate the stochastic resonance performance. A comparison study with different existing methods using both numerical and experimental data was conducted to illustrate the effectiveness and accuracy of the proposed methodology for early defect detection of rolling element bearings in different locations. The results show that the proposed method improves the fault detection by 3.5 days earlier than other stochastic resonance methods, and produces the best enhancement results for fault detection in the outer race, inner race, and rolling element of bearings, with the increase of characteristic frequency intensity coefficient by 126.3%, 118.1%, and 100.5% compared to traditional envelope signals, respectively.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"80 7","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139164102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RF-KELM Indoor Positioning Algorithm Based on WiFi RSS Fingerprint 基于 WiFi RSS 指纹的 RF-KELM 室内定位算法

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-22 DOI: 10.1088/1361-6501/ad1873

Bingnan Hou, Yanchun Wang

{"title":"RF-KELM Indoor Positioning Algorithm Based on WiFi RSS Fingerprint","authors":"Bingnan Hou, Yanchun Wang","doi":"10.1088/1361-6501/ad1873","DOIUrl":"https://doi.org/10.1088/1361-6501/ad1873","url":null,"abstract":"\u0000 WiFi-based fingerprint indoor positioning technology has been widely concerned, but it has been facing the challenge of lack of robustness to signal changes, and the positioning service requires fast and accurate positioning estimation. Therefore, an RF-KELM positioning algorithm with good comprehensive performance is proposed in this paper. Both offline and online phases are included by this algorithm. In the offline phase, the original data of WiFi fingerprint is first transformed into a form more suitable for positioning. Then, AP selection is performed on the fingerprint database containing many useless access points (APs), in which random forest algorithm (RF) which can evaluate the importance of features is used. Finally, the KELM algorithm is trained with the sub-database that have undergone data transformation and AP selection. In the online phase, firstly, the obtained signal is processed, and then the trained KELM is used to predict the position of the data processed signal. In this paper, the performance of the proposed RF-KELM positioning algorithm is thoroughly tested on a publicly available dataset, and the experimental results demonstrate that the proposed algorithm not only has high positioning accuracy and robustness, but also takes only 0.08 s to position online.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"27 24","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138947142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observation of dynamic evolution process of vacuum arc microscopic particles based on emission spectrum principle 基于发射光谱原理的真空电弧微观粒子动态演化过程观测

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-22 DOI: 10.1088/1361-6501/ad1870

Shan Liu, Zhao Yuan, Jin Zhang, Liming Liu, Lixue Chen, Chuanqi Wu, Yuan Pan

{"title":"Observation of dynamic evolution process of vacuum arc microscopic particles based on emission spectrum principle","authors":"Shan Liu, Zhao Yuan, Jin Zhang, Liming Liu, Lixue Chen, Chuanqi Wu, Yuan Pan","doi":"10.1088/1361-6501/ad1870","DOIUrl":"https://doi.org/10.1088/1361-6501/ad1870","url":null,"abstract":"\u0000 The distribution of microscopic particles directly affect the recovery of post arc insulating medium and determine whether fault current can be interrupted. Based on the principle of vacuum arc emission spectrum, a high-speed spectrum observation platform was built to study the distribution of microscopic particles during the arc burning, and the axial and radial spectral line intensity and density distributions of atoms and ions under different current amplitudes were obtained. The results show that the CuI spectral line intensity has two peaks near the cathode and anode, while in the arc column it is relatively low. The peak of CuI spectral line intensity near the electrode is caused by electrode evaporation. The peak duration of CuI spectral line intensity near cathode is always longer than that near anode.CuII spectral line intensity is lower and appears later, disappears earlier, which in arc column increased obviously, compared with CuI. The CuII density near the cathode is higher than that near the anode, and the CuII density in the arc column is higher than two electrodes, which is similar to the axial distribution of electron density. The radial distribution curve of CuI and CuII density is similar to the radial distribution curve of spectral line intensity, showing the characteristics of high center and low edge in the radial direction of the arc gap. The difference is that the width of atomic spectral line is larger than that of corresponding ionic spectral line, the distribution curve of ionic spectral line is smooth and symmetrical, and the radial attenuation rate of CuII density is larger than that of corresponding CuI. This reflects the ionization of atoms and the effect of magnetic fields. The radial and axial distribution of particle density is opposite to that of excitation temperature. Electrode emission will first affect the atom formation.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"16 10","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138947622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Cross-Domain Intelligent Fault Diagnosis Method Based on Multi-source Domain Feature Adaptation and Selection 基于多源领域特征适应和选择的跨领域智能故障诊断方法

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-22 DOI: 10.1088/1361-6501/ad1871

Ning Jia, Weiguo Huang, Yao Cheng, Chuancang Ding, Jun Wang, Changqing Shen

{"title":"A Cross-Domain Intelligent Fault Diagnosis Method Based on Multi-source Domain Feature Adaptation and Selection","authors":"Ning Jia, Weiguo Huang, Yao Cheng, Chuancang Ding, Jun Wang, Changqing Shen","doi":"10.1088/1361-6501/ad1871","DOIUrl":"https://doi.org/10.1088/1361-6501/ad1871","url":null,"abstract":"\u0000 Although fault diagnosis methods integrating transfer learning are research hotspots, their ability to handle industrial fault diagnosis problems with large domain differences still needs to be improved. A multi-source domain feature adaptation and selection (MDFAS) method is presented to address the issues of domain mismatch and domain negative transfer. The method integrates the top-level network parameter transfer strategy with the 2D Convolutional Neural Network (2DCNN) backbone network to acquire the target domain feature extractor quickly. Multiple feature adaptive extractors (FAEs) are constructed using a multi-branch structure to align the source and target domain's feature distributions, respectively. The inter-domain distance computed by multi-kernel maximum mean discrepancy (MK-MMD) is embedded in the FAEs loss function to improve the inter-domain matching degree. Based on the information gain of the adaptively integrated features, the ensemble adaptive selection is performed on the extracted feature matrices to exclude the negative transfer feature. Finally, the effective feature matrix is input into the diagnosis classifier for classification. Cross-domain fault diagnosis experiments are developed based on the data set gathered from several types of rotating machinery operated under varied working conditions. The experimental results show that the proposed method outperforms the existing intelligent fault diagnosis methods in terms of fault detection accuracy, generalization, and stability.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"15 10","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138944427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A MCKF-based Cascade Vector Tracking Method Designed for Ship Navigation 专为船舶导航设计的基于 MCKF 的级联矢量跟踪方法

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-22 DOI: 10.1088/1361-6501/ad1874

Wei Liu, Panting Ma, Yuan hu, Xingdi Wang, Tsung-Hsuan Hsieh, Bing Han, Shengzheng Wang

{"title":"A MCKF-based Cascade Vector Tracking Method Designed for Ship Navigation","authors":"Wei Liu, Panting Ma, Yuan hu, Xingdi Wang, Tsung-Hsuan Hsieh, Bing Han, Shengzheng Wang","doi":"10.1088/1361-6501/ad1874","DOIUrl":"https://doi.org/10.1088/1361-6501/ad1874","url":null,"abstract":"\u0000 In ship navigation, the most widely used technology is Global Navigation Satellite Systems (GNSS), which provide the ship’s position and velocity continuously over a period of time. However, when ships are blocked by port buildings or bridges, the quality of signals received from shipborne GNSS receivers may be reduced, resulting in inaccurate ship positioning that poses a risk to navigational safety. In an occluded environment, the measurement process during the signal processing of shipborne GNSS receivers is nonstationary and prone to measurement anomalies, which can contaminate measurement noise with outliers. To address this problem, a cascaded non-coherent vector tracking loop (VTL) is designed, with the Maximum correntropy Kalman filter (MCKF) serving as a cascaded carrier/code pre-filter for shipborne GNSS receivers. The measurement noise covariance matrix of the pre-filter is adaptively calculated and corrected using the carrier-to-noise ratio (CNR) and the maximum correntropy criterion, respectively. The algorithm proposed is more sensitive to outliers than the traditional tracking methods and can effectively solve the state estimation problem under the condition of measurement anomalies. Specifically, the algorithm offers ships with more precise position and velocity estimations and lower signal tracking errors than traditional tracking methods under both static and dynamic conditions, as demonstrated by shipboard experiments. The horizontal positioning is increased by 88.4% and the horizontal velocity error is reduced by 62.1% in the occluded environment under dynamic conditions.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"60 12","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138945877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on satellite laser ranging observation task scheduling method 卫星激光测距观测任务调度方法研究

IF 2.4 3区工程技术

Measurement Science and Technology Pub Date : 2023-12-21 DOI: 10.1088/1361-6501/ad180a

lv zequn, An Ning, Fan Cunbo, Chengzhi Liu, Zhenwei Li, Gao Jian, Guanyu Wen, Dong Xue

{"title":"Research on satellite laser ranging observation task scheduling method","authors":"lv zequn, An Ning, Fan Cunbo, Chengzhi Liu, Zhenwei Li, Gao Jian, Guanyu Wen, Dong Xue","doi":"10.1088/1361-6501/ad180a","DOIUrl":"https://doi.org/10.1088/1361-6501/ad180a","url":null,"abstract":"\u0000 Satellite Laser Ranging (SLR) is a technology with the highest precision of single measurement of satellite radial distance, which is developing rapidly in the direction of long-distance, high-precision and automation. SLR autonomous observation task scheduling is an important step in realizing station automation, which needs to satisfy the principles of satellite tracking priority and maximization of observation revenue at the same time. In order to improve the automation and intelligence level of SLR system, based on the framework of ant colony optimization algorithm, this paper combines the dynamic optimization characteristics of ant colony optimization algorithm and the local optimization characteristics of greedy algorithm, introduces the maximum-minimum ant mechanism, and puts forward a scheduling scheme for SLR observation task based on greedy ant colony algorithm (GACA). The results show that compared to the current scheduling methods applied in practice. The results show that compared with the current scheduling method applied in practice, the number of observation satellites obtained from the GACA algorithm-based observation task planning for the SLR system has been improved by 37.4%, the total arc segment of satellite observation with higher priority has been extended by 36.47%, and the total observation gain has been increased by 42.39% in the same period of time. It effectively solves the problems of low efficiency, easy to miss stars and less stars in the observation process in manual scheduling, and provides a simple, practical, efficient and convenient observation task planning scheme for the establishment of an unmanned SLR system.","PeriodicalId":18526,"journal":{"name":"Measurement Science and Technology","volume":"49 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0