作　　者： ; ; ;

机构地区： 南京理工大学电子工程与光电技术学院

出　　处： 《宇航学报》 2013年第8期1137-1145,共9页

摘　　要： 对MIMO雷达的系统结构和它采用ISAR技术时的信号模型进行分析,以二次降维方式详细讨论了回波信号在波数域的分布特点,得出两条针对成像应用的MIMO雷达阵列设计准则。在此基础上,提出一种可有效聚焦的极坐标格式算法,经过对MIMO雷达回波数据逐次渐进降维重排,将其从四维转换到二维,然后通过距离向和方位向两次一维插值,把以极坐标格式记录的回波数据变换为直角坐标下均匀分布的数据。针对推导过程中因平面波假设引入的误差进行了分析,得到算法的适用条件。最后仿真验证了本文算法的有效性。 The system configuration and its signal model of MIMO radar based on the ISAR technique is analyzed. Considering the distributed characteristics of echo signals in a wavenumber domain by use of two-step reduces dimension, a new effective polar format algorithm is presented, and some guidelines for designing MIMO imaging radar arrays are obtained. The algorithm transforms the echo data from four-dimension to two-dimension through alternately reduced dimension and sorting. The two 1-D interpolations in range and azimuth are used to convert the echo data from polar coordinate to cartesian coordinate. Analysis of the error introduced by the plane wave assumption provides limits on the imaged scene size. Finally, the simulations are performed to verify the algorithm.

关 键 词： 多入多出雷达 逆合成孔径雷达 极坐标格式算法 雷达成像

领　　域： [电子电信] [电子电信]