MIMO雷达采用ISAR技术成像，可以综合利用MIMO的空间采样和ISAR的时间积累，减少阵元、提高成像质量。但当系统参数不完全匹配时，会出现空间与时间采样不等效现象。该文研究了空时不等效对成像质量的影响，经过详细推导，得到计算成像结果中虚假目标数量、位置的数学公式，给出了目标与最大假目标幅度比值的解析表达，并对目标幅度衰减情况进行了定量分析。在此基础上，对目标上特殊点进一步讨论，总结了它们方位像的特点。最后，通过仿真验证了分析推导的正确性。%MIMO radar imaging using ISAR technique combines the space sampling of MIMO radar and the time sampling of ISAR techniques, which can save many antenna elements and improve image resolution. However, there will be the nonequivalent relationship between the space sampling and time sampling, when parameters fail to be matched. By analyzing the effect of nonequivalent relationship between space and time in detail, this paper obtains the number and locations of false targets. Analytical formulas to calculate the peak to false ratio is deduced, and amplitude attenuation of targets is quantitatively analyzed. On this basis, further discussion gives some characteristics of images for targets in the special locations. Finally, simulations are performed to verify these analyses and formulas.
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