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A Method for Oscillation Errors Restriction of SINS Based on Forecasted Time Series.

Zhao L, Li J, Cheng J, Jia C, Wang Q - Sensors (Basel) (2015)

Bottom Line: However, Schuler, Foucault, and Earth periodic oscillation errors significantly cut down the real-time accuracy of SINS.Finally, the periodic oscillation errors are restricted on account of the principle of eliminating the periodic oscillation signal with a half-wave delay by mean value.Simulation and test results show that the method has good performance in restricting the Schuler, Foucault, and Earth oscillation errors of SINS.

View Article: PubMed Central - PubMed

Affiliation: College of Automation, Harbin Engineering University, Harbin 150001, China. zhaolin@hrbeu.edu.cn.

ABSTRACT
Continuity, real-time, and accuracy are the key technical indexes of evaluating comprehensive performance of a strapdown inertial navigation system (SINS). However, Schuler, Foucault, and Earth periodic oscillation errors significantly cut down the real-time accuracy of SINS. A method for oscillation error restriction of SINS based on forecasted time series is proposed by analyzing the characteristics of periodic oscillation errors. The innovative method gains multiple sets of navigation solutions with different phase delays in virtue of the forecasted time series acquired through the measurement data of the inertial measurement unit (IMU). With the help of curve-fitting based on least square method, the forecasted time series is obtained while distinguishing and removing small angular motion interference in the process of initial alignment. Finally, the periodic oscillation errors are restricted on account of the principle of eliminating the periodic oscillation signal with a half-wave delay by mean value. Simulation and test results show that the method has good performance in restricting the Schuler, Foucault, and Earth oscillation errors of SINS.

No MeSH data available.


(a) Simulation results of attitude errors for maneuvering carrier with no inertia device errors; (b) Simulation results of velocity errors for maneuvering the carrier with no inertia device errors; (c) Simulation results of position errors for maneuvering the carrier with no inertia device errors.
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sensors-15-17433-f008: (a) Simulation results of attitude errors for maneuvering carrier with no inertia device errors; (b) Simulation results of velocity errors for maneuvering the carrier with no inertia device errors; (c) Simulation results of position errors for maneuvering the carrier with no inertia device errors.

Mentions: Figure 8 shows that although the carrier is in the maneuvering state sustainably, Schuler, Foucault, and Earth periodic oscillation errors caused by initial errors can be suppressed, which is impossible for the damping inertial navigation system. Known from the simulation curves of,, and, the period of oscillation errors that relate to the rotation of the Earth is smaller than 24 h, primarily due to the high velocity. However, the method has good performance in restricting the oscillation errors still, which indicates that the method is not affected by the motion state of the carrier.


A Method for Oscillation Errors Restriction of SINS Based on Forecasted Time Series.

Zhao L, Li J, Cheng J, Jia C, Wang Q - Sensors (Basel) (2015)

(a) Simulation results of attitude errors for maneuvering carrier with no inertia device errors; (b) Simulation results of velocity errors for maneuvering the carrier with no inertia device errors; (c) Simulation results of position errors for maneuvering the carrier with no inertia device errors.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541942&req=5

sensors-15-17433-f008: (a) Simulation results of attitude errors for maneuvering carrier with no inertia device errors; (b) Simulation results of velocity errors for maneuvering the carrier with no inertia device errors; (c) Simulation results of position errors for maneuvering the carrier with no inertia device errors.
Mentions: Figure 8 shows that although the carrier is in the maneuvering state sustainably, Schuler, Foucault, and Earth periodic oscillation errors caused by initial errors can be suppressed, which is impossible for the damping inertial navigation system. Known from the simulation curves of,, and, the period of oscillation errors that relate to the rotation of the Earth is smaller than 24 h, primarily due to the high velocity. However, the method has good performance in restricting the oscillation errors still, which indicates that the method is not affected by the motion state of the carrier.

Bottom Line: However, Schuler, Foucault, and Earth periodic oscillation errors significantly cut down the real-time accuracy of SINS.Finally, the periodic oscillation errors are restricted on account of the principle of eliminating the periodic oscillation signal with a half-wave delay by mean value.Simulation and test results show that the method has good performance in restricting the Schuler, Foucault, and Earth oscillation errors of SINS.

View Article: PubMed Central - PubMed

Affiliation: College of Automation, Harbin Engineering University, Harbin 150001, China. zhaolin@hrbeu.edu.cn.

ABSTRACT
Continuity, real-time, and accuracy are the key technical indexes of evaluating comprehensive performance of a strapdown inertial navigation system (SINS). However, Schuler, Foucault, and Earth periodic oscillation errors significantly cut down the real-time accuracy of SINS. A method for oscillation error restriction of SINS based on forecasted time series is proposed by analyzing the characteristics of periodic oscillation errors. The innovative method gains multiple sets of navigation solutions with different phase delays in virtue of the forecasted time series acquired through the measurement data of the inertial measurement unit (IMU). With the help of curve-fitting based on least square method, the forecasted time series is obtained while distinguishing and removing small angular motion interference in the process of initial alignment. Finally, the periodic oscillation errors are restricted on account of the principle of eliminating the periodic oscillation signal with a half-wave delay by mean value. Simulation and test results show that the method has good performance in restricting the Schuler, Foucault, and Earth oscillation errors of SINS.

No MeSH data available.