An Improved Second-Order Sliding Mode Control for an Interception Guidance System without Angular Velocity Measurement

It is well-known that the successful implementation of current sliding-mode guidance laws relies on two key points: one prior knowledge upper bound target’s maneuver, and other accurate measurement motion information. The truth maneuver usually difficult to acquire can only be roughly estimated. Measurements are often affected by noise physical limitations onboard sensor. This paper presents an improved second-order law handle these problems simultaneously while addressing chattering phenomenon, which inherently exists in sliding mode-based controller. We achieve this using estimation from extended state observer (ESO) tracking differentiator (TD). In light employed ESO, utilized give external disturbance, not required. Most interestingly, we show information estimated efficiently ESO real time. A TD filter further embedded remove unwanted detected signal. series simulations has been conducted, clearly demonstrating accuracy sufficient for implement interception. removes but also avoids phase-loss associated with conventional filters. Moreover, phenomenon completely eliminated control channel.