A sliding-mode based guidance law for intercepting missile with passive ranging law

This paper proposes the development and implementation of the sliding-mode based guidance law with a passive 3-D ranging law by using angle-only measurements (e.g. IR image sensor data). The passive ranging law applies the Modified Spherical Coordinates (MSC) based method and the well-known Extended Kalman filter technique to conduct further analysis for the tracking. In addition, The Interacting Multiple Model (IMM) technique coupled with multiple sub-filters of ballistic missile motion is proposed in order to minimize the estimation errors of the range and range rates incurred by the target´s maneuvers. Considering the estimation errors, the guidance law is designed applying sliding-mode technique in order to deal with the non- maneuvering target and the maneuvering target with imperfect information. Various simulation results can verify the reliability and stability of our designed system.