Learning-based design optimization of second-order tracking differentiator with application to missile guidance law

Qin, Wen; Wang, Mingkai; Li, Xin; Chang, Yuxiang

doi:10.1016/j.ast.2023.108302

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…If the position signal is directly differentiated in the discrete-time domain, significant noise is involved and causes distortion in the velocity information, thereby leading to poor compensation performance. Owing to the capacity of the optimal tracking differentiator in discrete-time form to rapidly track input signals without overshoot, it has advantages in eliminating signal vibration and improving differentiation quality [40][41][42][43]. Therefore, the discrete optimal tracking differentiator with nonlinear characteristics is applied to estimate the SITS velocity.…”

Section: Velocity Estimation Based On Tracking Differentiatormentioning

confidence: 99%

Stability Analysis and Delay Compensation for Space Instable Target Simulator

Bai,

Li,

Zhao

et al. 2024

Actuators

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The space instable target simulator (SITS) is a vital actuator for ground verification of on-orbital capture technology, the motion performance of which directly affects simulation credibility. Different delays reduce the stability of SITS and ultimately lead to its divergence. In order to achieve high-fidelity simulation, the impacts of force measurement delay, the discrete control cycle, and simulator response delay on stability are analyzed first. Then, the dynamic equation and transfer function identification model of the hybrid simulator is constructed, and the necessary and sufficient conditions of its stability and convergence are obtained using the Routh criterion. After that, a novel switching compensator with variable gain is proposed to reduce the superimposed effects of the three delays, the compensation principle diagram of which was built, and its mathematical model including the energy observer and nonlinear tracking differentiator is also established. Finally, three sets of numerical simulations were conducted to validate the correctness of the stability analysis and effectiveness of the proposed compensation method. The simulation results show that all three types of delays can cause SITS to lose stability under critical stable motion states, and the delay in force measurement has the greatest impact, followed by the influence of the control cycle. Compared with the force applied to the simulated target, the velocity, and the recovery coefficient of the space instable target using fixed gain and linear gain compensation, the proposed compensator has significantly better performance.

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Section: Velocity Estimation Based On Tracking Differentiatormentioning

confidence: 99%