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根据天线远区场对口径波谱的局部依赖特性，引入有效近场的概念，提出一种面向远场计算的波谱射线方法．该法采用波谱射线抽取的方法计算有效近场，通过近场空域积分计算远场，适合于具有雷达罩、透镜等近区散射体的天线远场计算．文中以带罩连续口径及阵列天线的远场方向图计算为例，验证了方法的正确性和有效性．
According to the local dependence of aperture field on the aperture spectrum, the concept of effective near-field is introduced and a spectrum ray method for far-field calculation is proposed. In this method, the effective near-field is calculated by the method of spectral ray extraction, and the far field is calculated by the near-field airspace integral. It is suitable for the far-field calculation of antennas with near-field scatterers such as radomes and lenses. In this paper, the calculation of far-field pattern with continuous aperture and array antenna with cover is taken as an example to verify the correctness and effectiveness of the method.