Further, by double FOURIER series expansion and intricate derivation, strict output analytic solution is acquired.

针对模型，通过双fourier级数展开和繁琐的数学推导，求得了输出电压的严格解析表达式。

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The difficulty in the derivation of bistatic SAR imaging algorithms lies in the bistatic point target reference spectrum, particularly in the analytic forms.

双基SAR成像的主要难点在于解析的点目标二维频谱的求取。

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