Missile sliding mode guidance law based on extended state observer

Based on the technology of extended state observer (ESO), a novel missile sliding mode guidance law was derived to intercept maneuvering target. According to relative movement between missile and target in the process of interception, the difficult question was effectively settled that too large overload was required during terminal intercepting phase, which was addressed by currently estimating and dynamically compensating to target acceleration via ESO. Thus, the goal of precision against target was achieved. Moreover, accounting for the autopilot as second-order dynamics in simulation, three simulation experiments of different interception strategies, which included head-on interception, tail-chase interception and head-pursuit interception, were investigated in the two kinds of cases of intercepting periodic maneuvering target and aperiodic maneuvering target. Compared with sliding mode guidance law based on finite time convergence, the results show the strong robustness and validities of the proposed sliding mode guidance law based on ESO in the terminal interception guidance.