Sliding mode guidance for impact time and angle constraints

Kumar, Shashi Ranjan and Ghose, Debasish (2018) Sliding mode guidance for impact time and angle constraints. In: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING, 232 (16). pp. 2961-2977.

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Abstract

This paper proposes a guidance strategy, which caters to both impact angle and impact time terminal constraints. This guidance scheme is based on switching between impact time and impact angle guidance laws. Unlike the existing impact time guidance laws, the proposed guidance strategy takes into account the curvature of the trajectory due to requirement of impact angle. The guidance law is derived using sliding mode control theory with the switching surface based on impact time error. The interceptor first corrects its course to nullify the impact time error and then aims to achieve interception with desired impact angle. In order to reduce transitions between the two guidance laws, a novel hysteresis loop is introduced in the switching conditions. The guidance law is initially designed for stationary targets, and later it is extended to constant velocity targets using the notion of predicted interception point. In order to validate the efficacy of the proposed guidance strategy, simulation results are presented with constant as well as realistic time-varying speed interceptor models for different engagement scenarios against stationary and constant velocity targets. The performance of the guidance law is evaluated under noisy measurements and the presence of system lag and its performance is compared with other existing guidance laws.

Item Type:	Journal Article
Publication:	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
Publisher:	SAGE PUBLICATIONS LTD
Additional Information:	Copyright of this article belongs to SAGE PUBLICATIONS LTD
Keywords:	Guidance law; impact time; impact time and impact angle; salvo attack; realistic interceptors; sliding mode control
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	08 Feb 2019 09:15
Last Modified:	08 Feb 2019 09:15
URI:	http://eprints.iisc.ac.in/id/eprint/61379

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