A Method of Deflection of the Vertical Measurement Based on Phase Correction

IEEE Access

Miao Wu¹  Pengfei Jiang¹  Wen An¹  Jiangning Xu¹ 

[1] College of Electrical Engineering, Naval University of Engineering, Wuhan, China;

关键词: Deflection of the vertical;    direct difference model;    SINS/GNSS;    horizontal attitude angle error;    time delay;    phase correction;   

DOI  :  10.1109/ACCESS.2020.3047392

来源: DOAJ

【 摘 要 】

The combination of the strapdown inertial navigation system (SINS) and the global navigation satellite system (GNSS) is an ingenious means to measure the deflection of the vertical (DOV). The error characteristics of the traditional direct difference model show that the DOV cannot be recovered by the traditional method because of the ignorance of the frequency characteristics of DOV. The error propagation relationship considering frequency domain characteristics between the horizontal attitude angles error and DOV is established. The Bode diagrams of the transfer functions between the horizontal attitude angles in time domain, when the frequency of DOV in time domain is in the range of 7 × 10^-4rad/s <; ω <; error and DOV show that there is a phase lag in the transfer functions, which is shown as a time delay 0.05rad/s. Then the improved direct difference model considering the time delay is established, and is simplified according to the spherical harmonic characteristics of gravity field. The simulation results show that the improved model with phase correction can recover the high-frequency component of DOV with the error standard deviations of δ = 1.05" and δη = 0.99". Finally, the model is also verified by a section of ship test data, and the error standard deviations of the DOV recovered are δ = 1.46" and δη = 1.24".

【 授权许可】

Unknown