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gnss gyroscopes:determination of angular velocity and acceleration with very high-rate gnss

Satellite Navigation 2024年第1期5卷 74-90页

作者： Yun Shi Peiliang Xu Yuanming Shu Xiaolin Meng School of Geomatics Xi’an University of Science and TechnologyXi’an710054People’s Republic of China Disaster Prevention Research Institute Kyoto UniversityUjiKyoto611-0011Japan College of Marine Geosciences Ocean University of ChinaQingdaoPeople’s Republic of China School of Instrument Science and Engineering Southeast UniversityNanjing210096People’s Republic of China

Although global navigation satellite systems(gnss)have been routinely applied to determine attitudes,there exists no literature on determining angular velocity and/or angular acceleration from *** by the invention of computerized accelerometers of the correspondence author and following the success of accurately recovering translational velocity and acceleration waveforms from very high-rate gnss precise positioning by Xu and his collaborators in 2021,we propose the concept of gnss gyroscopes and reconstruct angular velocity and acceleration from very high-rate gnss attitudes by applying regularization under the criterion of minimum mean squared *** major results from the experiments can be summarized in the following:(i)angular velocity and acceleration waveforms computed by applying the difference methods to high-rate gnss attitudes are too noisy and can be physically not meaningful and numerically *** same can be said about inertial measurement unit(IMU)attitudes,if IMU gyros are not of very high accuracy;(ii)regularization is successfully applied to reconstruct the high-rate angular velocity and acceleration waveforms from 50 Hz gnss attitudes and significantly outperforms the difference methods,validating the proposed concept of gnss *** comparing the angular velocity and acceleration results by using the difference methods and regularization,we find that the peak values of angular velocity and acceleration by regularization are much smaller by a maximum factor of 1.57 in the angular velocity to a maximum factor of 8662.53 times in the angular acceleration in the case of high-rate gnss,and by a maximum factor of 1.26 in the angular velocity to a maximum factor of 2819.85 times in the angular acceleration in the case of IMU,respectively;and(iii)the IMU attitudes apparently lead to better regularized angular velocity and acceleration waveforms than the high-rate gnss attitudes,which can well be explained by the fact that the

关键词： Angular velocity Angular acceleration high-rate gnss gnss attitudes gnss gyroscopes Regularization

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Impact of different sampling rates on precise point positioning performance using online processing service

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Geo-Spatial Information Science 2021年第2期24卷 302-312,I0008页

作者： Serdar Erol Reha Metin Alkan İ.Murat Ozulu Veli Ilçi Department of Geomatics Engineering Istanbul Technical UniversityIstanbulTurkey Department of Technical Programs Hitit UniversityÇorumTurkey Department of Geomatics Engineering Ondokuz Mayıs UniversitySamsunTurkey

In this study,the effect of different sampling rates(*** recording interval)on the Precise Point Positioning(PPP)solutions in terms of accuracy was *** this purpose,a field test was carried out inÇorum province,Turkey,on 11 September *** this context,a Geodetic Point(GP)was established and precisely coordinated.A static gnss measurement was occupied on the GP for about 4-hour time at 0.10 second(s)/10 Hz measurement intervals with the Trimble R10 geodetic grade gnss *** original observation file was converted to RINEX format and then decimated into the different data sampling rates as 0.2 s,0.5 s,1 s,5 s,10 s,30 s,60 s,and 120 *** these RINEX observation files were submitted to the Canadian Spatial Reference System-Precise Point Positioning(CSRS-PPP)online processing service the day after the data collection date by choosing both static and kinematic processing *** this way,PPP-derived static coordinates,and the kinematic coordinates of each measurement epoch were *** PPP-derived coordinates obtained from each decimated sampling intervals were compared to known coordinates of the GP for northing,easting,2D position,and height *** to the static and kinematic processing results,high data sampling rates did not change the PPP solutions in terms of accuracy when compared to the results obtained using lower sampling *** results of this study imply that it was not necessary to collect gnss data with high-rate intervals for many surveying projects requiring cm-level accuracy.

关键词： Precise Point Positioning(PPP) online gnss postprocessing service high-rate gnss sampling rate monitoring structure behavior

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Real-time Monitoring of Strong Ground Motion using 50Hz gnss Data of Continuous Operation Reference Station （CORS）

Real-time Monitoring of Strong Ground Motion using 50Hz GNSS...

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第五届中国卫星导航学术年会

作者： Zhang Xi Huang Dingfa Liao Hua Feng Wei Li Meng School of Geosciences and Environmental Engineering Southwest Jiaotong University Sichuan Earthquake Administration

ISBN: (纸本)9783642547393

high-rate gnss plays an important role in monitoring the process of strong ground motion, such as seismic activity. To achieve real-time monitoring, a reasonable solution and filtering method are needed, especially for the 50Hz data. Based on the analysis of differential and combination method, effects of ionosphere and troposphere have obvious trend within a short time, but cannot be treated as linear trend completely. To monitor real time surface deformation accurately, a newly developed strategy is proposed in this paper, it can effectively reduce atmospheric error of double-difference in real-time. 50Hz data are obtained during Lushan earthquake （Ms7.0）, Sichuan, China;the coseismic deformations are captured successfully on the sites of CORS stations. With 3D grid searching method, the obtained earthquake focus is basically consistent with USGS published results. It shows that the proposed method is effective and reasonable for strong ground motion monitoring by using high-rate gnss observations, especially for seismic activity.

关键词： CORS high-rate gnss Morphological Filtering Sliding Monitoring Model Strong Ground Motion Coseismic Deformation

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