A Novel Attitude Estimation Algorithm Based on the Non-Orthogonal Magnetic Sensors

Area of Science:

• Aerospace Engineering
• Guidance, Navigation, and Control

Background:

• Projectile attitude measurement is crucial for accuracy.
• Existing extremum ratio methods are susceptible to random disturbances.

Purpose of the Study:

• To propose a novel integral ratio method for projectile attitude calculation.
• To enhance the anti-disturbance performance of attitude measurement.

Main Methods:

• Analyzed non-orthogonal magnetic sensor measurement theory.
• Developed an integral ratio mathematical model.
• Combined least-square preprocessed data with rotating extremum features.

Main Results:

• The integral ratio method significantly improves attitude calculation accuracy.
• Attitude error variance decreased by over 90% compared to the extremum ratio method.
• The proposed method utilizes all data in a spin cycle, unlike the single-point extremum method.

Conclusions:

• The integral ratio method offers superior performance for projectile attitude measurement.
• This approach is robust against environmental disturbances in high-spin scenarios.
• The method is suitable for practical application in projectile systems.