Ground accelerating moving target imaging method for airborne high-resolution CSSAR
The airborne circular stripmap synthetic aperture radar(CSSAR)has complex target signal characteristics and significant high-order components of the target range equation due to its circular motion,which brings many difficulties to the imaging of moving targets.Considering that high-resolution is the future development trend,a ground accelerated moving target imaging method is proposed for airborne high-resolution CSSAR.Firstly,to address the issue of significant high-order components in the target range equation,a fourth-order Taylor approximate range model is established to ensure the imaging quality.Next,a two-dimensional frequency-domain signal model of the target is derived,and it is proposed to efficiently achieve target focusing through two-dimensional frequency-domain phase multiplication.The differential evolution algorithm is also used to efficiently achieve accurate search of various parameters of the range model.Finally,the experimental results validate the effectiveness of the proposed method.
NETL
NSTL
万方数据
