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

Zhu, Jianliang; Wu, Panlong; Bo, Yuming

doi:10.3390/s16050730

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…It should be noted that our investigated object is mortar, which can be regarded as a non-spinning projectile. When a projectile with rotation is considered, a magnetic sensor [28,29,30] may be necessary for the transformation. [DAxDAyDAz]=[cosθcosψcosθsinψ−sinθ−sinψcosψ0sinθcosψsinθsinψcosθ][DNxDNyDNz]…”

Section: Correction Strategy Designmentioning

confidence: 99%

Correction Strategy of Mortars with Trajectory Correction Fuze Based on Image Sensor

Fan

2019

Sensors

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For a higher accuracy of projectiles, a novel trajectory correction fuze is proposed. In this design, the sensor and actuator were reduced to achieve a balance between performance and affordability. Following introduction of the fuze concept, the flight model was presented and the crossrange and downrange components of trajectory response under control were investigated. The relationship between the inertial coordinate system and the detector coordinate system was studied so that the imager feedback could be used to derive the actual miss distance. The deployment time of canards and roll angle of the forward fuze were derived and used as the inputs of the control system in this strategy. Example closed-loop simulations were implemented to verify the effectiveness of the strategy. The results illustrate that the accuracy increase is evident and the proposed correction concept is applicable for terminal correction of mortars.

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Section: Correction Strategy Designmentioning

confidence: 99%

Correction Strategy of Mortars with Trajectory Correction Fuze Based on Image Sensor

Fan

2019

Sensors

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“…High spinning projectiles work in extreme environments with high overload and high speed. Limited to the size and cost of the projectile, high-precision, large-volume sensors, such as ring laser gyroscopes, cannot be used to measure the angular velocity of the projectile [1]. Therefore, the miniaturized, low-cost, overload-resistant MEMS sensor is suitable for the implementation of the navigation and guidance process.…”

Section: Introductionmentioning

confidence: 99%

Magnetometer-Based Phase Shifting Ratio Method for High Spinning Projectile’s Attitude Measurement

Zhao

Liu

et al. 2019

IEEE Access

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Accurate measurement of high spinning projectiles' attitude is the basis of guidance and control. In order to reduce the attitude measurement error and improve the attitude update rate, a magnetometerbased phase shifting ratio method is proposed in this paper. This method does not introduce additional installation errors as the existing methods, simplifies the calibration of the extreme value ratio-pitch angle curve, and makes full use of the measurement data of the sensors. The attitude update is synchronized with the magnetometer output without using the local geomagnetic information. Simultaneously, the local geomagnetic errors are avoided. The results of numerical simulation and semi-physical simulation experiments show that compared with the three orthogonal ratio method and the crest and trough method, the proposed algorithm in this paper can increase the attitude update rate by more than 2 times and the attitude calculation accuracy can be enhanced by 30%. INDEX TERMS Magnetometer, phase shifting, extreme ratio, attitude measurement, high spinning projectile.

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“…This low cost and high precision method is called the ‘zero-crossing method’. Based on this method, experts at the Nanjing University of Science and Technology proposed an extreme value ratio method that combined non-orthogonal magnetic sensors, and conducted research in related areas [35,36]. Researchers at the Beijing Information Science and Technology University proposed a novel phase shift ratio method based on the extreme value ratio method [37].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Estimating Pitch and Yaw of Rotating Projectiles Based on Dynamic Constraints

An¹,

Wang

Liu

et al. 2019

Sensors

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This paper addresses the difficult problem of measuring the attitude of a high-spinning projectile and presents a novel method for estimating the pitch and yaw angles of the projectile in flight. The method is based on analysis of the external moment of the rotating projectile during flight and theoretical derivations obtained from the dynamics’ equations. First, the principle of zero-crossing method is introduced, which explains the process of geomagnetic azimuth and roll measurements by the non-orthogonal geomagnetic sensor combination. Then, the dynamics constraint equations between the Euler angles and flight-path angle, trajectory deflection angle of the projectile are derived using the dynamics equations of the projectile rotating around the centroid, and analysis of the flight characteristics of the projectile in stable flight. Next, the spatial orientation relationship between pitch, yaw angles and magnetic azimuth is established based on the physical principle of geomagnetic azimuth. Finally, the pitch and yaw angles are estimated using the unscented Kalman filter (UKF), with the dynamics constraint equations serving as the driving equations. In the UKF prediction stage, the Runge-Kutta method is used to discretize the state equation that improves the prediction accuracy. Simulation results show that the proposed method can be used to accurately calculate the pitch and yaw angles, and results of experimental data processing also verify the feasibility of the proposed method for real-world applications.

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

Cited by 6 publications

References 14 publications

Correction Strategy of Mortars with Trajectory Correction Fuze Based on Image Sensor

Correction Strategy of Mortars with Trajectory Correction Fuze Based on Image Sensor

Magnetometer-Based Phase Shifting Ratio Method for High Spinning Projectile’s Attitude Measurement

A Novel Method for Estimating Pitch and Yaw of Rotating Projectiles Based on Dynamic Constraints

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