A Low-Cost MEMS Missile-Borne Compound Rotation Modulation Scheme

Area of Science:

• Navigation Systems Engineering
• Control Theory
• Aerospace Engineering

Background:

• Rotation modulation (RM) is crucial for improving inertial navigation system (INS) accuracy.
• Traditional single-axis RM struggles with modulating all constant errors, limiting its use in highly dynamic environments like missiles.

Purpose of the Study:

• To address error accumulation and divergence in single-axis RM for INS.
• To propose and analyze a novel rotation scheme for enhanced INS accuracy.
• To optimize INS algorithms for the new rotation modulation scheme.

Main Methods:

• Analysis of error propagation principles for the novel rotation scheme.
• Investigation of conditions for constant error modulation.
• Optimization of the original RM navigation algorithm for the new scheme.

Main Results:

• The proposed rotation scheme effectively modulates error divergence in the roll angle.
• A significant improvement in roll angle accuracy, by two orders of magnitude, was achieved.
• Experimental and simulation results validate the effectiveness of the new scheme.

Conclusions:

• The novel rotation scheme overcomes limitations of traditional single-axis RM.
• This advancement is critical for high-precision navigation in highly dynamic environments.
• The improved roll angle accuracy has direct implications for missile guidance systems.