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Optimal Rotational Angular Velocity Determination Method Based on Compound Rotary Semi-Strapdown Inertial Navigation
Chenming Zhang1, Jie Li1, Xiaoqiao Yuan1
1National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China.
Sensors (Basel, Switzerland)
|June 24, 2022
Summary
Compound rotation modulation (CRM) improves guided missile navigation by modulating roll-axis errors. This study introduces an optimal rotation angular velocity method (K-value method) to enhance rotary semi-strapdown inertial navigation system (RSSINS) accuracy.
Area of Science:
- Navigation Systems
- Aerospace Engineering
- Control Theory
Background:
- Single-axis rotation modulation (SRM) in guided missiles accumulates roll-axis errors, compromising navigation accuracy.
- Compound rotation modulation (CRM) enhances SRM by superimposing one-dimensional rotation to modulate roll-axis errors.
- The effectiveness of CRM is influenced by Inertial Measurement Unit (IMU) errors and modulation angular velocity.
Purpose of the Study:
- To propose an optimal rotation angular velocity determination method for improving the accuracy of rotary semi-strapdown inertial navigation systems (RSSINS).
- To analyze residual errors within the CRM scheme.
- To investigate the relationship between incomplete modulation error and modulation angular velocity in CRM.
Main Methods:
- Analysis of residual errors in the compound rotation modulation (CRM) scheme.
- Discussion of the relationship between incomplete modulation error and modulation angular velocity.
- Proposal of the K-value method for determining optimal modulation angular velocity.
Main Results:
- The K-value method effectively determines the optimal modulation angular velocity for CRM.
- The proposed method significantly improves navigation accuracy in guided projectiles.
- Error suppression in CRM is optimized by selecting the appropriate modulation angular velocity.
Conclusions:
- The K-value method offers an effective solution for optimizing modulation angular velocity in CRM.
- Implementing the K-value method enhances the navigation accuracy of guided projectiles.
- This approach addresses the limitations of SRM and improves the performance of RSSINS.
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