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以不同基线长度的干涉仪为准,从大气折射、二次波的影响和天线遮挡等三方面讨论了旋转综合孔径中的传播效应。文中给出了大气折射引起的超额路径差的估算式,地面反射波存在的条件和它引起的相位差计算式,以及考虑空隙不足有绕射损耗时天线遮挡的临界角的计算式.用一些典型数据计算了传播效应的影响,得出了一些主要结论。
Based on the interferometer with different baseline length, the propagation effects in the rotating synthetic aperture are discussed from three aspects: atmospheric refraction, the influence of the second wave and the antenna shielding. In this paper, we give the formula of estimation of excess path difference caused by atmospheric refraction, the condition of ground reflection and the formula of phase difference caused by it, and the calculation formula of the critical angle of antenna block when considering the gap loss and diffraction loss. The typical data have calculated the effect of propagation effects and reached some major conclusions.