【摘要】 在考虑到地球曲率、大气无线电折射率垂直梯度、地表反射系数和地面粗糙度等因素对无线电波传播影响的条件下,推演了计算雷达波束内能量分布和气象目标物回波功率的表达式.根据这些公式的计算结果表明,雨区回波功率与不考虑这些因素情况下的值相比较,可有-3至+6分贝的偏差,具体值取决于雷达离地高度、天线仰角、雷达波长、波束宽度、地表反射系数和粗糙度等.更多还原

【Abstract】 The equations for calculating the echo power and the energy distribution within radar beam were derived, with taking earth curvature, atmospheric refractivity gradient, reflective factor and roughness of the surface into consideration. The estimation results based on these equations show that the rain echo power may deviate from its normal value by a factor of -3 to +6 db depending on the radar height, antenna elevation, wave length, beam width, surface reflectivity and roughness.更多还原