Cooperative guidance law based on finite time control technology

A cooperative guidance law based on finite time control technology is proposed for multiple flight vehicles in salvo attack. The leader-follower strategy is adopted for cooperative engagement. A flight vehicle is selected as the leader, the others are followers. The state variables of the leader are selected as the reference state, and followers track the reference state, which makes the state of followers converge to the leader’s to ensure that all the flight vehicles arrive to the target simultaneously. For this tracking control system, an effective nonlinear state tracking controller is designed using finite time control technology and dynamic inversion theory. And a practical method to estimate the time-to-go is also presented. Time-to-go of the leader is used to design the parameter adaptive regulator, making the parameters of controller can be adjusted on-line in an effective range, thus the control force of the controller can be changed in real time according to the actual situation. The parameter adaptive regulator works with the state tracking controller together, making state variable of the controller converge in finite time. Numerical simulation was carried out using the cooperative guidance law based on exponential convergence control and finite time control, respectively. Simulations results show that the cooperative guidance law based on finite time control technology has obvious advantage in convergence speed and attack effect.