TY - JOUR
T1 - A Time Synchronization Method between FBG Deformation Measurement System and Airborne DPOS Based on Waveform Matching
AU - Sun, Yihong
AU - Gong, Xiaolin
AU - Li, Jianli
AU - Zhu, Zhuangsheng
AU - Liu, Zhanchao
AU - Qu, Chunyu
AU - Ding, Xiaoshuang
N1 - Publisher Copyright:
© 2001-2012 IEEE.
PY - 2021/9/15
Y1 - 2021/9/15
N2 - The airborne Distributed Position and Orientation System (DPOS) is an important means for multi-point motion measurement required for earth observation with multi-task sensing loads. The sub-nodes in DPOS rely on the main node to perform transfer alignment for them to get high-precision motion data, which requires accurate deformation data and the relative motion relationship between different nodes. Fiber Bragg Grating (FBG) is one of the main means of deformation measurement at present. However, the time synchronization error between FBG and DPOS directly restricts the accuracy of transfer alignment. For this, a high-precision time synchronization method based on waveform matching is presented. Firstly, the data correlation between FBG and DPOS is analyzed. Then the main time error factors, sampling frequency and time delay are determined. On this basis, the empirical mode decomposition and wavelet analysis are used to extract and match the vibration data from the FBGS and bending angle data calculated by DPOS, thus updating the time-varying sampling frequency and time delay of FBGS, and finally achieving high-precision time synchronization between FBGS and DPOS. Results of ground dynamic experiment show that the standard deviation and mean value of FBG time error is less than 4ms and 2ms respectively, and the deformation displacement error of synchronized FBG data is less than 1%, which provides a prerequisite for high-precision transfer alignment of DPOS.
AB - The airborne Distributed Position and Orientation System (DPOS) is an important means for multi-point motion measurement required for earth observation with multi-task sensing loads. The sub-nodes in DPOS rely on the main node to perform transfer alignment for them to get high-precision motion data, which requires accurate deformation data and the relative motion relationship between different nodes. Fiber Bragg Grating (FBG) is one of the main means of deformation measurement at present. However, the time synchronization error between FBG and DPOS directly restricts the accuracy of transfer alignment. For this, a high-precision time synchronization method based on waveform matching is presented. Firstly, the data correlation between FBG and DPOS is analyzed. Then the main time error factors, sampling frequency and time delay are determined. On this basis, the empirical mode decomposition and wavelet analysis are used to extract and match the vibration data from the FBGS and bending angle data calculated by DPOS, thus updating the time-varying sampling frequency and time delay of FBGS, and finally achieving high-precision time synchronization between FBGS and DPOS. Results of ground dynamic experiment show that the standard deviation and mean value of FBG time error is less than 4ms and 2ms respectively, and the deformation displacement error of synchronized FBG data is less than 1%, which provides a prerequisite for high-precision transfer alignment of DPOS.
KW - POS
KW - deformation measurement
KW - fiber Bragg grating
KW - time synchronization
UR - https://www.scopus.com/pages/publications/85112626724
U2 - 10.1109/JSEN.2021.3093979
DO - 10.1109/JSEN.2021.3093979
M3 - 文章
AN - SCOPUS:85112626724
SN - 1530-437X
VL - 21
SP - 20324
EP - 20334
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
IS - 18
ER -