Proportional navigation (PN) has attracted a amount of interest in the missile interception and continues to be a benchmark for new missile guidance laws due to the high effectiveness and simple implementation [87, 285, 97, 248]. It is well known that PN is the optimal guidance law with a navigation ratio
= 3, and it can result in successful interceptions under a wide range of engagement conditions. However, the PN guidance law is more applicable for the task of intercepting a non-maneuvering target or a weakly maneuvering target. In practice, target acceleration can change rapidly. For intercepting a target with powerful maneuvering capability, the performance of PN is degraded and it may be ineffective for some orientations between missile and target.