Observability-enhanced proportional navigation guidance with bearings-onlymeasurements

We analyse the performance of the additive observable proportional navigati on guidance system, which is well-suited for low-cost homing missiles with bearings-only measurements. Closed-form solutions are derived for both mano euvring and non-manoeuvring targets. Guidelines on how to select the naviga tion constants of the control law:are resented. We show that the additive o bservable proportional navigation guidance system can cover a larger captur e area than can a conventional proportional navigation system.