弱起伏介質(zhì)中界面脈沖波的互相干函數(shù)
MUTUAL COHERENCE FUNCTION FOR LATERAL PULSE WAVE IN WEAK FLUCTUATING MEDIUM
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摘要: 在折射指數(shù)起伏具有Gauss譜的弱起伏隨機(jī)介質(zhì)中,設(shè)激發(fā)源為脈沖偶極子,利用Born近似和DGF方法,研究了隨機(jī)介質(zhì)內(nèi)部無(wú)線電通信中界面脈沖波(lateral pulse wave)的互相干函數(shù),得到了解析解,并用背景介質(zhì)層的反射系數(shù)、阻抗、導(dǎo)納等物理量通過超幾何級(jí)數(shù)的形式表示出來(lái)。結(jié)果表明,在該通信中,互相干函數(shù)的主要貢獻(xiàn)來(lái)源于相干場(chǎng),而非相干場(chǎng)的貢獻(xiàn)也是較大的。
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關(guān)鍵詞:
- 電磁場(chǎng); 隨機(jī)介質(zhì); 界面脈沖波; 相干函數(shù)
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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