双基地探测中无线电波后向散射问题的雷达方程
Radar equations in the problem of radio wave backscattering during bistatic soundings
摘要：
本文提出了一种求介质介电常数起伏的单次散射信号与傅里叶谱之间关系的方法，并考虑到散射体积由天线方向图决定，而且并不小。在这个方程的基础上，我们得到了雷达方程的散射信号谱的起伏的空间谱。此外，一个统计雷达方程，它涉及的平均统计功率的散射信号的介电常数波动的频谱密度没有一个经典的近似的不规则性的空间相关半径的小。本文讨论了双基地探测的情况，当精确的前向散射和精确的后向散射都不存在时，探测信号有足够的norrow谱带，使散射体积在菲涅耳半径量级范围内缓慢变化。由于存在大相关半径的相干结构，得到的统计雷达方程不同于经典的统计雷达方程，从而使接收信号谱不同于不规则结构的本征谱。
英文摘要：
This paper outlines a method of obtaining the relation between the singly scattered signal and the Fourier-spectrum of medium dielectric permititvity fluctuations, with due regard for the fact that the scattering volume is determined by antenna patterns and is not small. On the basis of this equation we obtained the radar equation relating the scattered signal spectrum to the spatial spectrum of fluctuations. Also, a statistical radar equation is obtained, which relates the mean statistical power of the scattered signal to the spectral density of the dielectric permitivity fluctuations without a classical approximation of the smallness of the irregularities spatial correlation radius. The work deals with the bistatic sounding case, when the exact forward and exact backward scattering are absent, and sounding signal have sufficiently norrow spectral band for scattered volume to change slowly on ranges of Fresnel radius order. The statistical radar equations obtained differs from the classical ones in the presence the coherent structures with big correlation radii, and so the received signal spectrum can differ from intrinsic spectrum of irregularities.
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