| 摘 要： | The equations for calculating the echo power from meteorological targets and the energy distribution within radar beam were derived, by taking the earth curvature, atmospheric refractivity gradient, reflection factor and the roughness of the earth's surface into consideration.The estimation based on these equations shows that the rain echo power may deviate from its normal value by a factor of-3 to 4 6 db depending on the radar height, antenna elevation, wave length, beam width, surface reflectivity and roughness.
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