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Two-dimensional laser Doppler velocimeter and its integrated navigation with a strapdown inertial navigation system
Applied Optics
|May 5, 2018
Summary
This study introduces a two-dimensional (2D) laser Doppler velocimeter (LDV) to improve vehicle navigation accuracy by suppressing jolts. The 2D LDV provides precise forward and vertical velocity measurements, enhancing integrated navigation systems.
Area of Science:
- Land navigation systems
- Optical measurement technologies
- Inertial navigation
Background:
- Laser Doppler velocimeters (LDVs) are crucial for vehicle velocity measurement in integrated navigation systems.
- One-dimensional (1D) LDVs are susceptible to interference from vehicle jolts, impacting navigation accuracy.
- Strapdown inertial navigation systems require accurate velocity data for precise positioning.
Purpose of the Study:
- To design a novel two-dimensional (2D) laser Doppler velocimeter (LDV) that mitigates the effects of vehicle jolts.
- To enhance the accuracy of vehicle navigation by improving velocity measurement.
- To provide high-precision altitude information alongside velocity data.
Main Methods:
- Development of a split-reuse 2D LDV comprising two mirror-mounted 1D velocimeter probes.
- Utilizing differential effects of vertical vibration on the probes to calculate forward and vertical velocities.
- Conducting vehicle-integrated navigation experiments to validate performance.
Main Results:
- The 2D LDV effectively suppresses the influence of vehicle jolts on velocity measurements.
- Significant improvement in navigation positioning accuracy was observed.
- High-precision altitude information was successfully obtained, with maximum altitude errors of 0.24 m and 0.22 m.
Conclusions:
- The designed 2D LDV offers a robust solution for accurate vehicle velocity and altitude determination in land navigation.
- This technology substantially enhances the performance of integrated navigation systems, particularly in environments with significant vibrations.
- The 2D LDV demonstrates superior performance over traditional 1D LDVs for jolt-prone applications.
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