本文用球函数展开散射场，结合刚性边界条件导出了刚性目标的重构公式，并利用该公式重构了刚性球和椭球的形状。
By spherical function expansion of the scattered sound field in conjunction with rigid boundary conditions, formulas for reconstructing the shapes of rigid scattering objects are derived.
基于这些性质提出了重构波场的一个解析公式。
Based on these properties we propose an analytic formula to reconstruct wave fields.
本文首先得到了均匀冲激串采样信号的FRFT，然后在此基础上导出了FRF T域上带通信号和低通信号的采样定理和重构公式。
In this paper, we first obtain the FRFT of the uniform impulse-train sampled signals, and based on it, we deduce sampling theorem and reconstruction formula for bandpass and lowpass signals with FRFT.
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