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Online calibration technology for a one-dimensional laser Doppler velocimeter based on a strapdown inertial
Applied Optics
|February 24, 2022
Summary
This study introduces an online calibration method for laser Doppler velocimeters (LDV) integrated with strapdown inertial navigation systems. The new approach achieves high-precision velocimeter calibration, significantly improving navigation accuracy.
Area of Science:
- Navigation Systems Engineering
- Optical Measurement Techniques
- Control Systems
Background:
- Integrated navigation systems combine multiple sensors for enhanced accuracy.
- Laser Doppler velocimeters (LDV) require precise calibration for reliable performance.
- Strapdown inertial navigation systems (SINS) provide crucial motion data.
Purpose of the Study:
- To develop and validate an online calibration method for LDV within an integrated navigation system.
- To leverage SINS data for accurate and efficient LDV calibration.
- To improve the overall precision of integrated navigation systems.
Main Methods:
- An online calibration approach for LDV using SINS data is proposed.
- Initial coarse calibration is performed using early-stage, high-accuracy SINS outputs.
- A Kalman filter is employed to refine the calibration results for high precision.
Main Results:
- The proposed online calibration method achieves high-precision calibration for the LDV.
- Experimental validation demonstrated a relative distance error of less than 0.02% in dead reckoning.
- The method effectively integrates LDV and SINS for improved navigation.
Conclusions:
- The developed online calibration technique offers a robust solution for LDV calibration in integrated navigation.
- This method significantly enhances the accuracy and reliability of navigation systems.
- The low error rate confirms the efficacy of the proposed calibration strategy.
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