Author(s)

Yingchun Wang, Liangliang Zhao, Jun Zhao and Jiangmin Yao

Corresponding Author

Yingchun Wang

ABSTRACT

Due to the influence of parameter perturbation and external disturbance, the traditional linear guidance control method with small disturbance can’t meet the needs of UCAV guided control. An adaptive sliding mode variable structure guidance law was optimized in order to improve the stability and nonlinearity of UCAV. The mathematical model of the target was established by the secondary calibration. The relative motion model of UCAV and target was established based on the six degree of freedom nonlinear model of UCAV. With using the variable structure control theory into the UCAV's guide, the adaptive sliding variable structure guidance law is derived. The simulation results show that the optimal control of UAV guidance law can improve the nonlinear performance of UCAV, and has a good anti disturbance ability. The control variables of UAV in the guidance law control process change smoothly and have good dynamic quality. The feasibility analysis proves the validity and rationality of the method. The design has the good dynamic quality.

KEYWORDS

UCAV; double-calibration; adaptive sliding variable structure guidance law; nonlinear general degree-of-freedom model