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Indian Institute of Science

1. Ghosh, Satadal. Analysis of Proportional Navigation Class of Guidance Law against Agile Targets.

Degree: 2014, Indian Institute of Science

Guidance is defined as the determination of a strategy for following a nominal path in the presence of o-nominal conditions, disturbances and uncertainties, and the strategy employed is called a guidance law. Variants of Proportional Navigation (PN), such as True Proportional Navigation (TPN) and Pure Proportional Navigation (PPN), have been studied extensively in the literature on tactical missile guidance. In the absence of target maneuvers, in a linear interceptor guidance problem, TPN was shown to be optimal. However, the standard PN class of guidance laws per se does not show good performance against maneuvering targets, and was found to be eective in intercepting a maneuvering target only from a restrictive set of initial geometries. Also, since these guidance laws were eectively designed for lower speed targets, they show a degraded performance when applied against higher speed targets. However, in the current defense scenario, two classes of agile targets, which are capable of continuous maneuver, and/or of much higher speed than the interceptor, are a reality. This thesis presents analysis of several variants of PN class of guidance laws against these two classes of agile targets. In the literature, an augmentation of the TPN guidance law, termed as Augmented Proportional Navigation (APN), was shown to be optimal in linearized engagement framework. The present work proposes an augmentation of the PPN guidance law, which is more realistic than TPN for an aerodynamically controlled interceptor, and an-alyzes its capturability in fully nonlinear framework, and develops sauciest conditions on speed ratio, navigation gain and augmentation parameter to ensure that all possible initial engagement geometries are included in the capture zone when applied against a target executing piecewise continuous maneuver. The thesis also obtains the capture zone in the relative velocity space for augmented PPN guidance law. In the literature, a novel guidance law was proposed for the interception of higher speed targets in planar engagement by using a negative navigation gain instead of the standard positive one, and was termed as Retro-PN. It was shown that even though the Retro-PN guided interceptor takes more time than PN guided one in achieving successful interception, Retro-PN performs significantly better than the classical PN law, in terms of capturability, lateral acceleration demand, and closing velocity, when used against higher speed targets. The thesis analyzes Retro-PN guidance law in 3-D engagement geometries to yield the complete capture zone of interceptors guided by Retro-PN guidance philosophy, and derives necessary and sucient conditions for the capture of higher speed non-maneuvering targets with and without a constraint on finiteness of lateral acceleration. Terminal impact angle control is crucial for enhancement of warhead eectiveness. In the literature, this problem has been addressed mostly in the context of targets with lower speeds than the interceptor. The thesis analyzes the performance of a… Advisors/Committee Members: Ghose, Debasish, Raha, Soumyendu.

Subjects/Keywords: Proportional Navigation; Maneuvering Target; Guidance; Augumented Pure Portional Navigation (APPN) Guidance Laws; Retro-PN Guidance Law; Guidance Laws; Higher-Speed Target; Agile Targets; Impact Angle Control; Composite Proportional Navigation (CPN); Impact Angle Analysis; Impact Time Control; Salvo Attack; Higher Speed Nonmaneuvering Targets; Time-varying Target; Mathematics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ghosh, S. (2014). Analysis of Proportional Navigation Class of Guidance Law against Agile Targets. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2903

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ghosh, Satadal. “Analysis of Proportional Navigation Class of Guidance Law against Agile Targets.” 2014. Thesis, Indian Institute of Science. Accessed December 05, 2019. http://hdl.handle.net/2005/2903.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ghosh, Satadal. “Analysis of Proportional Navigation Class of Guidance Law against Agile Targets.” 2014. Web. 05 Dec 2019.

Vancouver:

Ghosh S. Analysis of Proportional Navigation Class of Guidance Law against Agile Targets. [Internet] [Thesis]. Indian Institute of Science; 2014. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/2005/2903.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghosh S. Analysis of Proportional Navigation Class of Guidance Law against Agile Targets. [Thesis]. Indian Institute of Science; 2014. Available from: http://hdl.handle.net/2005/2903

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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