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To achieve this purpose, a fixed\u2010time disturbance observer\u2010based adaptive finite\u2010time guidance law is presented. First, a fixed\u2010time disturbance observer (FTDO) is designed to guarantee the fast estimation of the lumped disturbance caused by the target maneuver. Then, the FTDO\u2010based adaptive integral sliding mode backstepping (AISMB) guidance law is constructed for the interception guidance problem. Besides, several adaptive laws are established to estimate the derivative of virtual control inputs, making the \u201cdifferential explosion problem\u201d of conventional backstepping get avoided. The finite\u2010time convergence characteristic of the closed\u2010loop system is analyzed by utilizing the Lyapunov stability theory. Finally, the simulation examples are conducted to demonstrate the effectiveness of the proposed composite guidance law.<\/jats:p>","DOI":"10.1155\/2021\/8735625","type":"journal-article","created":{"date-parts":[[2021,8,14]],"date-time":"2021-08-14T20:05:09Z","timestamp":1628971509000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Fixed\u2010Time Disturbance Observer\u2010Based Adaptive Finite\u2010Time Guidance Law Design considering Impact Angle Constraint and Autopilot 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