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[prə′pȯr·shən·əl ‚nav·ə′gā·shən]
Homing guidance of a guided missile toward a moving target in which the missile turning rate is proportional to the rate of change of line of sight between missile and target.

The control of the trajectory of a body to home onto a target by changing the course of the body several times based on the rate of change of the sightline to the target. Thus, the angular rate of velocity is proportional to the angular rate of the line of sight to the target. This method normally is used by air-to-air and surface-to-air missiles.
References in periodicals archive ?
Wu, "A biased proportional navigation guidance law with large impact angle constraint and the time-to-go estimation," Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, vol.
Yang, "A unified approach to proportional navigation," IEEE Transactions on Aerospace and Electronic Systems, vol.
We take the firing point of the air-to-air missile as the coordinate origin (0, 0, 0) and assume that the missile moves following the Proportional Navigation law, whose proportional parameter [K.sub.[theta]] = [K.sub.[phi]] = 4, at a constant speed [v.sub.m] = 500 m/s with the pitching angle [K.sub.[theta]] = 0 and the azimuth angle [[phi].sub.m] = 0.
Pierson, "Optimal planar evasive aircraft maneuvers against proportional navigation missiles," Journal of Guidance, Control, and Dynamics, vol.
Ozgoren, "Look angle constrained impact angle control based on proportional navigation," in AIAA Guidance, Navigation, and Control Conference, pp.
Ratnoo, "Analysis of two-stage proportional navigation with heading constraints," Journal of Guidance, Control, and Dynamics, vol.
Target maneuvering and missile velocity changes will change the seeker look angle required to fly the proportional navigation path.
which generalizes the familiar proportional navigation law in the presence of one target; C is the missile Navigation Constant.
Wang, "A fractional-order modified proportional navigation law," Control Theory & Applications, vol.
According to the proportional navigation guidance law, the command acceleration of the missile [n.sub.c] is obtained.