| 卫星电视接收系统门限效应的定量分析 |
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| 引用本文： | 刘家勋,付亦宁. 卫星电视接收系统门限效应的定量分析[J]. 辽宁师范大学学报(自然科学版), 2001, 24(1): 39-41 |
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| 作者姓名： | 刘家勋 付亦宁 |
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| 作者单位： | 辽宁师范大学 教育技术系, |
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| 摘 要： | 门限电平的定量分析对卫生电视系统提高接收微弱信号的能力具有重要的指导作用。从卫星电视系统调频解调的调制增益出发，分析了调频的特点，给出了调频改善度的表达式，进而得出调频门限效应的概念。针对低输入载噪比条例下，S／N与C／N不再满足线性关系，并使输出信噪比急剧下降，此时将脉冲噪声影响考虑进来，对鉴频器输出信噪比进行更深入分析推导，得到调频门限的具体表达公式。通过结论能找到影响调频门限的主要因素，并为提高输出信噪比的技术措施提供依据。
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| 关 键 词： | 调频 门限效应 定量分析 卫星电视接收系统 门限电平 调制增益 接收能力 |
| 文章编号： | 1000-1735（2001）01-0039-03 |
| 修稿时间： | 2001-01-08 |
A Quantitative Analysis of the Threshold Effect of Satellite Television Receiving System |
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| LIU Jia-xun,FU Yi-ning. A Quantitative Analysis of the Threshold Effect of Satellite Television Receiving System[J]. Journal of Liaoning Normal University(Natural Science Edition), 2001, 24(1): 39-41 |
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| Authors: | LIU Jia-xun FU Yi-ning |
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| Abstract: | A quantitative analysis of the threshold level is important to improve the abilities of receiving weak signals for satellite television system. According to the modulation gain of the frequency modulation-demodulation, the FM characteristics are analysed, from which a formula for the FM improvement extent is derived and leads to the conception of frequency-modulation threshold effect. On condition that input the lower carrier-to-noise ratio (C/N), signal - to - noise ratio(S/N) and C/N are no longer linear, considering pulse noise and deducing S/N further, we can make the concrete formula frequency modulation threshold. |
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| Keywords: | satellite television frequency modulation threshold effect quantitative analysis |
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