Accession Number : ADP005716

Title :   Effects of Closing Speed Uncertainty on Optimal Guidance,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Willman, W. W.

Report Date : DEC 1987

Pagination or Media Count : 8

Abstract : An idealized planar intercept is analyzed in which an air-to-air homing missile has angular measurements of the line of sight to a randomly maneuvering target and seeks to use a guidance law which optimizes a specific performance criterion. If the closing speed were known precisely, the optimal guidance law for this case would be proportional navigation with a certain navigation gain. There is uncertainty in the closing speed, however, because of the target maneuvers and lack of range measurements. The effect of this uncertainty on the optimal guidance law is to increase the nominal value of the navigation gain, and apparently to add a rapid weaving component if the fractional uncertainty in the inverse target range exceeds a certain level.

Descriptors :   *GUIDANCE, OPTIMIZATION, INTERCEPTION PROBABILITIES, TARGET ANGLE, LINE OF SIGHT, AIR TO AIR MISSILES, GUIDED MISSILE TRAJECTORIES, GUIDED MISSILE TARGETS, AERIAL TARGETS, VELOCITY, PROPORTIONAL NAVIGATION.

Subject Categories : Air Navigation and Guidance
      Guided Missile Traj, Accuracy and Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE