Research on imaging algorithm for diving missile-borne SAR based on a curve trajectory

Abstract

This paper proposes a new algorithm for missile-borne SAR which has acceleration and velocity for vertical dimension, side dimension and azimuth dimension. The 3-dimension acceleration results in stronger coupling between range and azimuth signal which makes missile-borne SAR imaging more difficult. The algorithm decreases the coupling with range walk correction in range frequency domain, azimuth time domain firstly. Then we get 2-dimension frequency domain expression through the method of POSP and series reversion. Afterwards, the functions of second range walk correction, range compression, azimuth compression are given in 2-dimension frequency domain. Finally, the simulation results show the validity of the proposed algorithm.