采用二维CZT的MIMO雷达极坐标格式成像算法  

An Imaging Method for MIMO Radar with Polar Format Algorithm Based on Two-dimensional CZT

作　　者：赵小茹[1] 童宁宁[1] 胡晓伟[1] 丁姗姗[1] ZHAO Xiao-ru;TONG Ning-ning;HU Xiao-wei;DING Shan-shan(School of Air and Missile Defense,Air Force Engineering University,Xi’ an 710051,China)

机构地区：[1]空军工程大学防空反导学院,西安710051

出　　处：《火力与指挥控制》2018年第7期20-25,共6页Fire Control & Command Control

基　　金：国家自然科学基金资助项目(6157010318)

摘　　要：经典极坐标格式算法(PFA)以极坐标格式录取数据,利用二维插值运算在波数域中完成坐标系转换,进而通过直接FFT运算实现成像,但插值处理存在运算量大、复杂度高等问题。提出一种二维CZT的MIMO雷达极坐标格式成像算法,即用对波数谱的二维Chirp-Z变换(CZT)替代插值运算,实现距离向和方位向的坐标转换。对MIMO雷达单次快拍成像的仿真结果表明,所提算法能在保证成像质量的同时有效地提高运算速度,从而有效解决插值运算带来的大运算量和高复杂度等问题,且算法具有对信噪比依赖小的优点。The Polar Format Algorithm（PFA） analyzes target data which is extracted in polar format and uses two-dimension interpolation range the spatial-frequency samples from polar grid to Cartesian axis,and then implements imaging by using FFT. But there involves heavy computation and complexity during the interpolation above. Application of two-dimensional CZT for polar format algorithm in the multiple-input multiple-output（MIMO） radar is proposed in this paper. Instead of interpolation,the two-dimensional Chirp-Z transformation（CZT）switches the spatial spectrum under the range and azimuth and ensures good imaging quality with low complexity and less computations.Based on the simulation of the echo model of MIMO radar imaging proves the validity of the method is proposed with fast operation and less dependence of the single noise ratio（SNR）.

关 键 词：CZT变换 极坐标格式算法 波数谱 MIMO雷达单次快拍成像 

分 类 号：TN957.51[电子电信—信号与信息处理]