Image position analysis of motion errors for missile-borne SAR based on diving model

This paper concentrates on the synthetic aperture radar(SAR) image position analysis of the missile-borne SAR platform's motion errors based on the general missile-borne SAR diving model. The general missile-borne diving model expanded from the classic side-look image model includes three-dimensional position and three-dimensional velocity and can be used describe the motion of the missile-borne SAR flexibly. Based on the general model and the Doppler position equations of SAR slant image to ground image, the two-dimensional position errors expressions of the corrected image are derived. The expressions are the functions of the platform's three-dimensional position and three-dimensional velocity. Then the SAR image's position errors varying with the above six factors are simulated, also the whole-chain simulation including echo simulation, imaging and position measuring validated the correction of the image position expressions. The presented position expressions of the platform's motion errors can serve the platform's parameters choosing for the missile-borne system design, and it is of important value for engineering reference.