Accounting for the autopilot as second-order dynamics, an observer-based guidance law with terminal impact angle constraint is designed using the dynamic surface control method. Some first-order low-pass filters are introduced into the designing process to avoid the occurrence of high-order derivatives of the line of sight (LOS) angle in the expression of the guidance law such that the guidance law can be implemented in practical applications. The proposed guidance law is effective in compensating for the second-order autopilot lag. In simulation of intercepting targets with sinusoidal acceleration, the guidance law is compared with the biased proportional navigation guidance (BPNG) law in the presence of missile autopilot lag. Simulation results show that the proposed observer-based guidance law with terminal impact angle constraint is able to guide a missile with large autopilot lag to impact a target with a desired angle and achieve a small miss distance, even if the target escapes in a great and fast maneuver.
Observer-Based Guidance Law With Impact Angle Constraint
Beijing Aerospace Automatic Control Institute;
National Key Laboratory of Science and Technology on
Aerospace Intelligent Control,
Beijing 100854, China
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received June 1, 2016; final manuscript received March 22, 2017; published online July 10, 2017. Assoc. Editor: Yang Shi.
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Qu, P., Zhou, D., and Sun, S. (July 10, 2017). "Observer-Based Guidance Law With Impact Angle Constraint." ASME. J. Dyn. Sys., Meas., Control. November 2017; 139(11): 114504. https://doi.org/10.1115/1.4036664
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