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为了提高双基地偏振雷达的探测精度,从旋转椭球粒子散射和衰减的理论出发,推导出基于椭球雨滴群的双基地偏振雷达方程,并利用此方程探讨了旋转椭球雨滴群一致垂直取向情况下,主站雷达发射仰角、目标粒子群位置等因素对双基地偏振雷达探测能力的影响程度.结果表明,随着仰角的抬高,几何因子值和两种偏振状态下的回波功率比均出现了高值区和低值区面积减少的变化特征；散射截面因子值也随着仰角的抬高在水平偏振时增加,垂直偏振时减少.“,”In order to improve the detecting accuracy of bistatic polarization radar,bistatic radar equations for spheroid raindrop groups have been deduced based on electromagnetic scattering theory.By supposing all the particle rotation axis are vertical upward,these equations are used to discuss the effect of the elevation of transmitting antenna and the position of raindrops on the detection ability for bistatic polarization radar system.The results show that the areas of high and low values in the distribution of geometric factor and the ratio of echo power at horizontal and vertical polarization are all reduced as the elevation lifted.The value of scattering cross-section factor increases at horizontal polarization but decrease at vertical polarization as the elevation lifted.