PROPORTIONAL GUIDANCE (PROGUIDE) AND AUGMENTED PROPORTIONAL GUIDANCE (AUGMENTED PROGUIDE)

Abstract

Two new homing guidance laws, designated as proportional Guidance (PROGUIDE) and Augmented Proportional Guidance (Augmented PROGUIDE), have been developed for use against non-maneuvering and maneuvering targets, respectively. These guidance laws are the solutions of linear-quadratic regulator control problems and minimize deviations from the collision triangle over the entire period of homing flight, thereby indirectly minimizing miss distance. In contrast to proportional navigation (PRONAV), these algorithms command the achievement of angular acceleration instead of linear acceleration and there is a significant advantage in doing so. The guidance laws (1) are more compatible with the seeker measurements which are angular in nature, (2) do not require an estimate of time-to-go, (3) can be used to directly drive the skid-to-turn or bank-to-turn logic that produces autopilot input commands, (4) avoid actuator saturation through the real-time adjustment of a single parameter in each channel, and (5) are less sensitive to random errors. Thus these guidance laws are not only effective in and of themselves, but also provide a simple framework within which an integrated guidance and control design can be carried out. The integrated design accounts for interactions between the target state estimator, the guidance law, and the autopilot during the design process.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1JAMES R. CLOUTIER

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