摘要:
本文简要回顾了合成孔径侧视雷达系统和它的天线坐标系之间的几何关系,探讨了合成孔径侧视雷达天线的孔径电流分布的理论要求。在R.C.Heimiller(1962)和R.W.Bayma(1975)等人工作的基础上,进一步论证了当天线孔径电流分布不是同相时,它对合成孔径侧视雷达的综合阵列方向图和多普勒-时延响应的影响,并在平方律和立方律相位分布条件下,对这些影响作了计算。计算表明,它不仅会使综合阵列增益降低,而且会使多普勒-时延响应的信号-模糊比下降。考虑到这些影响,本文对R.W.Bayma等人(1975)提出的重复频率的取值范围提出了补充意见。
Abstract:
The geometrical relationship between the synthetic aperture radar (SAR) and its an-tenna coordinate system is reviewed briefly. The ideal aperture current distribution of SAR antenna is discussed in theoretical sense. On the basis of results derived by R. C. Heimiller (1962) and R. W. Bayma (1975), the effects of current distribution not in phase on the pattern of synthetic array and the Doppler-delay response are further analysed, and the numerical results calculated in the case of quadratic and cubic phase distributions are given. These results show that such phase distributions will cause the gain of synthetic array and the signal to ambiguity ratio of Doppler-delay response to be decreased. In consideration of these effects, the author proposes his additional remarks on the range of repetition frequency given by R. W. Bayma (1975).
下载:
