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.