Design of rolling-guidance law using virtual target with control of terminal azimuth for a fixed-trim vehicle

Fixed-trim vehicle with attack angle has the characteristic of simple configuration and less control channels. However, as the magnitude of lift force is uncontrollable, an appropriate guidance law is needed to ensure the guidance accuracy. Thus, in order to solve the guidance problem with the control of terminal azimuth for fixed-trim vehicle, a rolling-guidance law with virtual target was proposed. The rolling-guidance equation with virtual target was established. The basic guidance method was put forward, which is proved that the guidance law could accurately steer the vehicle and control the terminal azimuth effectively. The design method of virtual target was also given and the validity of rolling guidance was analyzed by simulation. The simulation result illustrates that: the rolling-guidance law with virtual target in this paper not only has higher precision of guidance and terminal azimuth control, but also has the simple design, which is convenient for engineering application.