Wang Honglun

Sliding mode based trajectory linearization control for hypersonic reentry vehicle via extended disturbance observer

This paper proposes a novel hybrid control framework by combing observer-based sliding mode control (SMC) with trajectory linearization control (TLC) for hypersonic reentry vehicle (HRV) attitude tracking problem. First, fewer control consumption is achieved using nonlinear tracking differentiator (TD) in the attitude loop. Second, a novel SMC that employs extended disturbance observer (EDO) to counteract the effect of uncertainties using a new sliding surface which includes the estimation error is integrated to address the tracking error stabilization issues in the attitude and angular rate loop, respectively. In addition, new results associated with EDO are examined in terms of dynamic response and noise-tolerant performance, as well as estimation accuracy. The key feature of the proposed compound control approach is that chattering free tracking performance with high accuracy can be ensured for HRV in the presence of multiple uncertainties under control constraints. Based on finite time convergence stability theory, the stability of the resulting closed-loop system is well established. Also, comparisons and extensive simulation results are presented to demonstrate the effectiveness of the control strategy.

Back-stepping active disturbance rejection control design for integrated missile guidance and control system via reduced-order ESO.

This paper proposes a novel composite integrated guidance and control (IGC) law for missile intercepting against unknown maneuvering target with multiple uncertainties and control constraint. First, by using back-stepping technique, the proposed IGC law design is separated into guidance loop and control loop. The unknown target maneuvers and variations of aerodynamics parameters in guidance and control loop are viewed as uncertainties, which are estimated and compensated by designed model-assisted reduced-order extended state observer (ESO). Second, based on the principle of active disturbance rejection control (ADRC), enhanced feedback linearization (FL) based control law is implemented for the IGC model using the estimates generated by reduced-order ESO. In addition, performance analysis and comparisons between ESO and reduced-order ESO are examined. Nonlinear tracking differentiator is employed to construct the derivative of virtual control command in the control loop. Third, the closed-loop stability for the considered system is established. Finally, the effectiveness of the proposed IGC law in enhanced interception performance such as smooth interception course, improved robustness against multiple uncertainties as well as reduced control consumption during initial phase are demonstrated through simulations.

Application of Tracking-Differentiator in Angular Measurements on Spinning Projectiles Using Magnetic Sensors

In this paper, the method of twin-channel tracking-differentiator (TD) has been proposed, which province roll and rate of roll for guidance ammunition by angular measurements using magnetic sensors with noise. Through simulation analysis and Compared with other methods, the efficiency and practicality of this method has been verified. The method keeps all the advantage of TD at the same time. Adjusting parameters of the algorithms is easier and easily applied to engineering.

Development of open architecture test systems

Next generation test system tends to be more dependent on open architecture, in order to address reusability and interoperability of test solutions. This paper provides a framework of open-architecture test systems, not only realizing the fundamental modularization and integration in a general open-architecture, but also reinforcing the interchangeability of TPS & instruments, as well as parallel development of test software by ATE software technologies. Basic structure, realization details, and a case study are presented in this paper to demonstrate its feasibility and prospective for a wide range of applications.

Novel Augmented Extended State Observer Design

This paper proposes the construction method and validation of novel augmented extended state observer (NAESO). First, based on singular perturbation technique, the general formulation and structure of NAESO is derived. Based on which, the linear NAESO version is given. The merits of the presented NAESO include ease of parameter selection and sufficient noise-rejection ability, since the measurement output only exists in the last equation of NAESO, and thus the estimations of states are less sensitive to noises than that of classical ESO. Finally, simulations and comparisons with the classical ESO are presented, which validate the excellent performance of the proposed method in noise restraining.