Abstract:

For the process of airborne synthetic aperture radar (SAR) missile terminal guidance, a new trajectory control arithmetic is proposed to meet the requirements of imaging resolution and the missile miss distance for motion states of the missile. By analyzing the SAR terminal guiding process and the relation between missile-target space geometry and imaging resolution, the need for imaging resolution is converted to constraints for motion states of the missile, and the requirement of miss distance is converted to constraints for lead angle of the missile. Based on inverse optimal control, performance index function containing undetermined coefficients is build and the coefficients is calculated on the basis of dynamic performance in the control system, then optimal control variable is calculated with time-variant weight coefficients, which can be tuned to meet the index requirement for different guidance modes. Simulation results demonstrate the validity of the arithmetic.