Ke Yi

Circular formation tracking control for time-delayed second-order multi-agent systems with multiple leaders

In this paper, circular formation tracking control problems for time-delayed second-order multi-agent systems (MASs) with multiple leaders are studied, where the state of followers are designed to form a circular formation while tracking the average state of the multiple leaders. A circular formation tracking control protocol with time-varying delays is proposed. Sufficient conditions for time-delayed second-order MASs with multiple leaders to realize circular formation tracking are given. The presented results can be applied to target enclosing problem for multiple unmanned aerial vehicles (UAVs) with a group of targets and time-varying delays. Numerical examples on target enclosing are provided to demonstrate the feasibility of the theoretical results.

Integration control design for a semi-strapdown seeker missile

Semi-strapdown coordinator is located on the missile body. Because of the existence of the parasitic loop, the semi-strapdown coordinator stable tracking control loop is strongly coupled with the body attitude control loop. As a result, the stability and tracking performance of the coordinator is severely affected. To deal with the stability and tracking problem of the semi-strapdown coordinator, an integration control system is proposed. The control law is designed based on backstepping theory. By choosing an appropriate feedback gain, the stability and dynamic performance of the system can be ensured. Finally, the integration control system is verified by simulation. The results show that the integration controller can solve the coupling problem between the semi-strapdown coordinator stable control and the body attitude control. The designed system is stable and has a good dynamic convergence performance.

Improved reference trajectory generation method in reentry guidance

After generating reference trajectory in the process of reentry guidance for reusable launch vehicle, if the designed bank angle curve is too close to the constraint boundary, there is a great possibility for the obtained reference trajectory to exceed the reentry corridor boundary. This paper proposed a margin searching method, to reduce the likelihood of generating a reference trajectory which exceeds the reentry corridor boundary and to improve the design success rate.