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roll angle measurement system based on triaxial magneto-resistive sensor

Journal of Measurement Science and Instrumentation 2013年第3期4卷 214-217页

作者：赵鑫炉张晓明 Science and Technology on Electronic Test &Measurement Laboratory North University of China Key Laboratory of Instrumentation Science &Dynamic Measurement(North University of China) Ministry of Education

Aiming at large error when inertial devices measure the roll angle under high overload conditions,the article designs one kind of roll angle measurement system based on magneto-resistive sensor which calculates the roll angle by micro controller *** results of a triaxial turntable show that using magneto-resistive sensor to measure roll angle is feasible and of high accuracy,and it can calculate the roll angle of the conventional projectile with the error in 1°.

关键词： magneto-resistive sensor roll angle errorCLC number:TP212.1 Document code:AArticle ID:1674-8042(2013)03-0214-04

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Remote Absolute roll-angle Measurement in Range of 180°Based on Polarization Modulation

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Nanomanufacturing and Metrology 2020年第3期3卷 228-235页

作者： Xiuguo Chen Jinbao Liao Honggang Gu Chuanwei Zhang Hao Jiang Shiyuan Liu State Key Lab of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhanChina

Remote measurement of object orientation is often required in many *** of the six degrees of freedom(DoF)that determine object orientation in space,the roll angle is the most difficult to measure using optical *** this letter,we propose a remote Stokes roll-angle sensor that measures roll angles from the detected Stokes vectors of modulated polarized light retroreflected from a sensing unit comprised simply of a retarder and a planar reflection *** results have shown that the proposed sensor can realize absolute roll angle measurement in an unprecedented range of 180°with a maximum absolute error of less than 0.25°and a measurement resolution of better than 0.01°.The proposed sensor adopts a coaxial design and takes the advantages of compactness,simplicity and low cost,and moreover,can be further expanded to a three-DoF angle sensor due to the sensitivity of the sensing unit to other two kinds of angles(pitch and yaw).

关键词： roll angle angle sensor Polarization modulation Stokes polarimeter

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Estimating the Baseline Error of Wide-Swath Altimeters Using Nadir Altimeters via Numerical Simulation

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Journal of Ocean University of China 2022年第3期21卷 681-693页

作者： MIAO Xiangying JIA Yongjun LIN Mingsen MIAO Hongli College of Information Science and Engineering Ocean University of ChinaQingdao266100China National Satellite Ocean Application Service(NSOAS) Beijing100081China

The baseline roll and length errors for wide-swath altimeters are major error sources in sea surface measurements that exhibit strong spatial characteristics in the cross-track *** errors can be identified and estimated in accordance with height differences at crossover points generated with nadir altimeters after excluding the interference from other error *** of the wide-swath altimeter baseline estimation methods considered only the roll error in previous studies.A numerical simulation was conducted in this study using nadir altimeters to estimate the roll and length errors simultaneously to provide a selectable scheme for baseline error estimation and correction for future wide-swath *** based on the parameters of the surface water and ocean topography mission and Sentinel-3A show that the correlation coefficient of the roll error between the estimated and simulated values is 0.89,while the correlation coefficient of the length error is *** sea surface height root mean square error(RMSE)can be reduced from 12.18 cm to 6.45 cm based on the two estimated *** estimation effect can be increased by using multiple nadir altimeters to form an observation *** numerical simulation of the five nadir altimeter constellation shows that the correlation coefficients of the roll and length errors would increase to 0.97,which reduces the sea surface height RMSE to 2.88 *** addition,the stability of this method is indicated in simulation experiments,which introduce different degrees of sea state errors.

关键词： baseline error wide-swath altimeter roll angle baseline length nadir altimeter crossover point height difference

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The effect of track alignment irregularity on wheel-rail contact geometry relationship in a turnout zone

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Journal of Modern Transportation 2012年第3期20卷 148-152页

作者： Li WANG Ping WANG Shunxi QUAN Rong CHEN MOE Key Laboratory of High-Speed Railway Engineering Southwest Jiaotong UniversityChengdu 610031China China Railway Siyuan Survey and Design Group Co.Ltd. Wuhan 430063China

The irregularity is a key factor affecting the wheel-rail contact geometry relationship. In this paper, we calculated the wheel-rail contact points at typical sections and obtained the longitudinal variation of the wheel-rail geometry relationship with the trace line method. The profile of the key rail sections was matched by cubic spline curve, and the shape interpolation was realized in non-controlling sections. The results show that the roll angles at each typical section increases gradually with the enlargement of track alignment irregularity. When the flange contact occurs, the roll angle increases dramatically. Proper track alignment irregularity towards the switch rail improves the structure irregularity of the turnout.

关键词： track alignment irregularity wheel-rail geometry relationship turnout roll angle

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