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7 - Midcourse Guidance

Published online by Cambridge University Press:  05 October 2014

Pierre T. Kabamba
Affiliation:
University of Michigan, Ann Arbor
Anouck R. Girard
Affiliation:
University of Michigan, Ann Arbor
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Summary

In this chapter, we present the fundamentals used in the analysis and design of midcourse guidance systems. These systems are predicated on the following assumptions:

  1. In mission planning, a set of nominal trajectories that meet mission specifications is determined.

  2. During flight, corrections are continually applied to the trajectory to return it to nominal. This sustained application of control authority is the distinguishing feature of midcourse guidance.

We consider three methods for midcourse guidance. In the first method, the set of nominal trajectories is parametrized by initial position and initial time, which specify the required velocity. This leads to the formalism of velocity-to-be-gained guidance, also known as Q-guidance. In the second method, a single nominal trajectory is determined and control is applied to return the trajectory to it. This leads to the formalism of state feedback guidance, also known as Delta-guidance. The third method combines state feedback guidance with navigation in that it uses Delta-guidance based on an estimate of the state vector rather than the true state vector.

Midcourse guidance is related to work presented in the previous two chapters. Indeed, in Chapter 5, the primary purpose of homing is to come close to a target - in other words, homing is a “final-value” problem. However, constant bearing guidance can be viewed as a form of midcourse guidance where the nominal trajectory is defined by β = 0.

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Publisher: Cambridge University Press
Print publication year: 2014

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  • Midcourse Guidance
  • Pierre T. Kabamba, University of Michigan, Ann Arbor, Anouck R. Girard, University of Michigan, Ann Arbor
  • Book: Fundamentals of Aerospace Navigation and Guidance
  • Online publication: 05 October 2014
  • Chapter DOI: https://doi.org/10.1017/CBO9781107741751.008
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  • Midcourse Guidance
  • Pierre T. Kabamba, University of Michigan, Ann Arbor, Anouck R. Girard, University of Michigan, Ann Arbor
  • Book: Fundamentals of Aerospace Navigation and Guidance
  • Online publication: 05 October 2014
  • Chapter DOI: https://doi.org/10.1017/CBO9781107741751.008
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Midcourse Guidance
  • Pierre T. Kabamba, University of Michigan, Ann Arbor, Anouck R. Girard, University of Michigan, Ann Arbor
  • Book: Fundamentals of Aerospace Navigation and Guidance
  • Online publication: 05 October 2014
  • Chapter DOI: https://doi.org/10.1017/CBO9781107741751.008
Available formats
×