Design of Bias Proportional Navigation Guidance Law for Motion Target with Impact Angle Constraint

In order to improve the guidance precision and increase the control of the falling angle, the bias proportional navigation guidance law to the moving targets with impact angle constraint is derived according to tilted moving target. By adding the relative motion state between missile and target in the bias term, the specified angle attack to the moving targets is realized. Considering imprecision of traditional time-to-go estimation under the moving targets with impact angle constraint, by predicting missile-target crack point, the time-to-go estimation method with impact angle constraint based on predicted crack point is designed under the deduced guidance law. The simulation results show that the estimation of designed time-to-go estimation method based on predicted crack point is precise under different angle constraint; The deduced bias proportional navigation guidance law to the fast-moving targets with impact angle constraint has better effect on high impact accuracy, control impact angle and overload.