Robust gain-scheduled autopilot design for spin-stabilized projectiles with a course-correction fuze

Theodoulis, Spilios; Sève, Florian; Wernert, Philippe

doi:10.1016/j.ast.2014.12.027

Cited by 41 publications

(25 citation statements)

References 26 publications

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“…In Figure 12, denotes the angle between the direction and the downrange direction. The calculation method of is The predictive impact point deviation can be calculated through (10), which is based on the perturbation theory:…”

Section: Optimization Of Trajectory Correctionmentioning

confidence: 99%

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Optimization of Trajectory Correction Scheme for Guided Mortar Projectiles

Zhang¹,

Gao²,

Yang³

et al. 2015

International Journal of Aerospace Engineering

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Guidance with traditional trajectory correction scheme usually starts from the trajectory apex time to reduce drag penalties early in flight; however, this method cannot get the max trajectory correction capability of canards according to our analysis. This paper presents an optimized trajectory correction scheme by taking different control phases of canards in ballistic ascending segment and ballistic descending segment. Simulation indicates that the optimized trajectory correction can improve the trajectory correction capability greatly. The result of an example trajectory and Monte Carlo simulations with the predictive guidance law and the trajectory tracking guidance law testifies the effectiveness of the optimized trajectory correction scheme. 6-DOF Trajectory ModelThe mortar projectile configuration used in this study is a representative 120 mm mortar projectile, 0.9 m long, finstabilized. The initial velocity is 280 m/s; the projectile weight, mass center location from the nose tip, roll inertia, and pitch

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Section: Optimization Of Trajectory Correctionmentioning

confidence: 99%

“…Firing accuracy of the guided projectiles can be dramatically improved by outfitting with a suitable trajectory correction system. The commonly used tools are impulse thrusters [1][2][3], inertial loads [4,5], drag brakes [6,7], fixed canards [8][9][10], and moveable canards [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Trajectory Correction Scheme for Guided Mortar Projectiles

Zhang¹,

Gao²,

Yang³

et al. 2015

International Journal of Aerospace Engineering

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show abstract

“…Trajectory correction fuze is very effective for improving attack accuracy and reducing impact point dispersion of the gun-launched projectiles [1,2,3,4]. Without any modification of the projectile body, the conventional stock ammunition could obtain the capacity of trajectory correction by simply replacing the trajectory correction fuzes.…”

Section: Introductionmentioning

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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“…In recent years, many decoupling methods in flight control have been proposed. A novel linear parameter-varying (LPV) system to resolve nonlinear dynamic equations has been proposed by Theodoulis et al [21,22] for high-spin rate projectiles with movable canards. Florian [23] has applied robust and gain-scheduling control methods to realize control in the yaw and pitch directions.…”

Section: Introductionmentioning

confidence: 99%

Novel Aiming Method for Spin-Stabilized Projectiles with a Course Correction Fuze Actuated by Fixed Canards

et al. 2019

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Spin-stabilized projectiles with course correction fuzes actuated by fixed canards have the problem of great coupling in both the normal and lateral directions due to intensive gyroscopic effects, which leads to inconsistent maneuverability in different directions. Due to the limited correction ability, which results from the miniaturization of the fuze and fixed canards, a target-aiming method is proposed here to make full use of the correction ability of the canards. From analysis on how the canards work and building an angular motion model, the correction characteristics of a spinning projectile with fixed canards have been studied, and the inconsistent maneuverability in different directions of the projectile has been explained and used to help establish the proposed target aiming method. Hardware-in-the-loop simulation based on a 155 mm howitzer shows that when the correction ability of fixed canards is unchanged, the proposed method can improve the striking accuracy by more than 20% when compared to the traditional method.

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Robust gain-scheduled autopilot design for spin-stabilized projectiles with a course-correction fuze

Cited by 41 publications

References 26 publications

Optimization of Trajectory Correction Scheme for Guided Mortar Projectiles

Optimization of Trajectory Correction Scheme for Guided Mortar Projectiles

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

Novel Aiming Method for Spin-Stabilized Projectiles with a Course Correction Fuze Actuated by Fixed Canards

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