摘要
针对目前MIMO-ISAR（ISAR Imaging Based on MIMO Technique）后向投影成像中算法运算量大的问题,提出了一种利用FFT运算的MIMO-ISAR后向投影快速算法。首先建立了MIMO-ISAR成像的回波信号模型,推导了相位补偿因子线性变化近似表达式,给出了将非线性相位补偿因子转化为线性补偿因子的约束条件,得到一种可使用FFT运算的MIMO-ISAR后向投影算法的高效处理算法。仿真表明,在满足约束条件下,成像质量较高;但随着慢拍采样数的增大,引起的相位失配增大,成像中旁瓣电平会抬高,算法成像运算量相比传统算法大大减小。
In order to reduce the computational cost in the current MIMO-ISAR back projection imaging algorithm, a fast algorithm based on FFT is proposed for MIMO-ISAR back projection. First, we establish the reflected wave signal model for MIMO-ISAR imaging. The approximate representation of linear change of the phase compensation factor is provided. Second, the constraints of the conversion from non-linear phase compensation factors to linear compensation factors are given. Finally, an efficient algorithm for MIMO-ISAR back projection based on FFT is achieved. Simulation results show that compared with traditional methods, the proposed algorithm reduces the computational cost greatly.
作者
李懿
LI Yi(Xi＇an Aeronautical University,College of Mechanical Engineering,Xi＇an 710077,China)
出处
《控制工程》
CSCD
北大核心
2018年第8期1375-1380,共6页
Control Engineering of China
基金
航空部资助项目
基于多尺度有限元和超声Lamb波的损伤监测研究(201509T7001)
