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| 论文题目 |
一种模数混合的PGC解调方案 |
| 论文题目（英文） |
Scheme of PGC demodulation based on analog-digital mixed system |
| 作者 |
宫铭举 |
| 发表年度 |
2008 |
| 卷 |
30 |
| 期 |
5 |
| 页码 |
538-540 |
| 期刊名称 |
压电与声光 |
| 摘要 |
分析了相位载波(PGC)技术的模拟数字混合解调方案 ,提出了一种改进的模拟数字混合系统。此系统可降低采样频率 ,消除寄生调幅的影响 ,同时克服了因载波漂移带来的解调困难。采用多量子阱激光器作为光源 ,使载波信号工作在较高的频率范围(0～20 MHz) ,从而提高了系统带宽和动态范围。试验表明 ,通过该方案建立的系统满足解调要求。由于较低的采样频率 ,该方案适合时分复用的光纤传感器阵列。
关键词:相位载波;模拟数字混合系统;采样频率;载波频率;寄生调幅;多量子阱激光器 |
| 摘要_英文 |
An improved analog2digital mixed system is put forward on the bases of scheme of phase generated carrier (PGC) . This scheme can greatly reduce sampling frequency , eliminate the effect of the parasitic amplitude modulation and overcome the carrier f requency drift . At the same time , a multi2quantum well laser is used as laser LED , which makes the carrier frequency have a wide range (0～20 MHz) , and so enhances the frequency bandwidth
and dynamical range of PGC demodulation. Experiment shows that it meets the demodulation requirement . Besides ,because of its lower sampling frequency , this scheme can be well applied to the time division multiplexing optical sensor array.
Key words :PGC; analog digital mixed system;sampling frequency ; carrier frequency ; parasitic amplitude modulation;multiquantum well laser
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