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Modern midcourse guidance laws in the endoatmosphere

Jalali Naini, S. H ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.2514/6.2005-6291
  3. Publisher: American Institute of Aeronautics and Astronautics Inc , 2005
  4. Abstract:
  5. In this paper, midcourse guidance strategies are derived considering approximate models for drag and thrust in the presence of gravity and autopilot dynamics. The guidance/control system is assumed as a linear time-varying and of arbitrary-order. The zero-effort miss differential equation is obtained in a way that three classes of guidance laws, namely optimal fuel, optimal energy, and closed-loop explicit strategy, can be derived by available methods for minimum and nonminimum phase autopilots. The resulting guidance laws have the structure of a guidance gain multiplied by the zero-effort miss. Several thrust/drag models arc also considered and discussed to obtain the effective navigation ratio and zero-effort miss equation. The presented method is applicable to both midcourse and terminal phases. Moreover, the differential equation of velocity-to-be-gained is obtained assuming the gravitational acceleration to be given as a vectorial function of time. For an aerodynamically controlled interceptor, the guidance law is modified in a way that it produces the commanded acceleration in the direction normal to its velocity vector or approximately normal to its body axis. This leads to a class of guidance law based on the generalized collision course
  6. Keywords:
  7. Aerodynamics ; Differential equations ; Earth atmosphere ; Gravitation ; Navigation systems ; Velocity measurement ; Aerodynamically controlled interceptors ; Guidance gain ; Guidance laws ; Velocity vectors ; Electronic guidance systems
  8. Source: AIAA Guidance, Navigation, and Control Conference 2005, San Francisco, CA, 15 August 2005 through 18 August 2005 ; Volume 6 , 2005 , Pages 4560-4576 ; 1563477378 (ISBN); 9781563477379 (ISBN)
  9. URL: https://arc.aiaa.org/doi/10.2514/6.2005-6291