Physical meaning: the self-correlation function and the energy spectrum density function compose a Fourier transformpair.
物理含义：能量信号的自相关函数与能量谱密度函数构成傅立叶变换对。
2
Relationship between the target scattering function and the echo signal is deduced to hold as a Fourier transformpair by analyzing the texture of echo signal for a passive radar imaging system;