Millimeter-wave (MMW) radiation characteristics of solid targets are very complex, this paper started with the research on modeling and simulation of the metal ball. Due to the property of millimeter-wave resembling light, the ray tracing theory was used to analyze the two-ray propagation of direct reflection and ground secondary reflection of the metal ball surface. The radiation temperature calculation model was established and the MATLAB simulation platform of millimeter-wave radiation characteristics of the metal ball was achieved based on the geometric model of triangle surface element division of the metal ball and the space geometry relation of relative motions between detector and target. The validity of the modeling method is verified through the antenna temperature curves of metal ball and round metal plate under given simulation conditions, and the results show that the metal ball can be equivalent to a nonmetal round plane target with 1.3 times linear size through comparative analysis of the signal waveform characteristics, which provides more accurate and effective data and theoretical support for target recognition and localization in millimeter-wave passive detection.% 立体目标毫米波辐射特性的研究十分复杂，本文从规则金属球入手进行建模仿真研究.由于毫米波似光性，利用射线跟踪思想分析了金属球表面直射和地面二次反射的双射线传播情况，建立了辐射温度计算模型，并基于金属球表面三角面元划分的几何模型及探测器与目标交会运动中的空间几何关系，实现了金属球体目标毫米波辐射特性的 MATLAB 仿真平台.在假定的仿真条件下，给出了金属球体目标和圆形金属板平面目标的天线温度曲线，验证了本文仿真建模方法的正确性.通过信号波形特征对比分析，结果表明金属球体目标可等效为线性尺寸增大约1.3倍的非金属圆形平面目标，为毫米波被动探测的目标识别与定位提供了更准确有效的数据理论支持.
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