Modified proportional guidance law for television image guided unmanned aerial vehicle

The guidance problem with terminal angular constraint and frame angle restriction of television image seeker under the condition of lower cruise speed of unmanned aerial vehicle (UAV) is addressed. The guidance goal in the problem is to null miss distance and to achieve a desired impact attitude angle simultaneously. In order to fulfill the guidance goal, a new homing guidance law - a modified proportional navigation - was put forward. The guidance law consists of signals of line-of-sight rate and frame angle in lateral profile, and line-of-sight rate, frame angle and desired impact attitude angle in longitudinal profile. The parameters of the guidance law were adjusted by simulation. Monte Carlo simulation was employed to evaluate its precision and trajectory property. Simulation results show the advantage of the proposed guidance law in image guided weapons with overhead attack.