弱起伏介质中界面脉冲波的互相干函数
MUTUAL COHERENCE FUNCTION FOR LATERAL PULSE WAVE IN WEAK FLUCTUATING MEDIUM
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摘要: 在折射指数起伏具有Gauss谱的弱起伏随机介质中,设激发源为脉冲偶极子,利用Born近似和DGF方法,研究了随机介质内部无线电通信中界面脉冲波(lateral pulse wave)的互相干函数,得到了解析解,并用背景介质层的反射系数、阻抗、导纳等物理量通过超几何级数的形式表示出来。结果表明,在该通信中,互相干函数的主要贡献来源于相干场,而非相干场的贡献也是较大的。Abstract: Mutual coherence function for lateral pulse wave in radio communiction in the weak fluctuating random media, by means of assuming that the refracitive-index fluetuation in the random media is of Gaussian spectrum and excited soure is pulse dipolc, is investigated by using Born approxiamation and dyadic Green s function method, and the analytical solution for mutual coherence function is obtained and represented by reflective coefficients, impedence and admittance terms, and generalized hypergeometric series etc. The results reveal that the main contribution to the mutual coherence function comes from coherence field, and the contribution of incoherence field can not be neglected.
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