| 变采样率全数字相位载波解调技术 |
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| 引用本文： | 蓝天,张春熹,李立京,韩晓娟. 变采样率全数字相位载波解调技术[J]. 北京航空航天大学学报, 2008, 34(5): 503-506 |
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| 作者姓名： | 蓝天 张春熹 李立京 韩晓娟 |
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| 作者单位： | 北京航空航天大学 仪器科学与光电工程学院, 北京 100083 |
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| 摘 要： | 基于相位载波(PGC,Phase Generated Carrier)解调各环节的信号频率范围,提出变采样率解调方案,解决高采样频率下的实时全数字PGC解调问题.对干涉输出信号采用高采样率进行模数转换,提高解调带宽和动态范围.对混频相乘和低通滤波后的环节采用降低采样率处理,减少实时数字信号处理的运算量.设计变采样率全数字PGC解调系统,采用现场可编程门阵列(FPGA,Field Programmable Gate Arrays)并行实现混频相乘和低通滤波环节,采用数字信号处理器(DSP, Digital Signal Processor)实现后续解调环节,实现采样率高达1MHz的实时解调.实验结果表明频率为5kHz、幅度为1rad的被测信号可以被有效解调.
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| 关 键 词： | 干涉仪 光纤传感器 相位调制 解调 数字信号处理 |
| 文章编号： | 1001-5965(2008)05-0503-04 |
| 收稿时间： | 2007-04-20 |
| 修稿时间： | 2007-04-20 |
Multirate digital phase generated carrier demodulation |
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| Lan Tian,Zhang Chunxi,Li Lijing,Han Xiaojuan. Multirate digital phase generated carrier demodulation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(5): 503-506 |
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| Authors: | Lan Tian Zhang Chunxi Li Lijing Han Xiaojuan |
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| Affiliation: | School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | Based on the signal bandwidth in each phase generated carrier(PGC) demodulation procedure,a multirate demodulation scheme was proposed to solve the real time digital PGC demodulation problem at high sampling rate.The interfered output was analog-to-digital converted at high sampling rate to improve demodulation bandwidth and dynamic range.The procedures after frequency mixing and low pass filtering were down sampled and digital PGC demodulation computation was reduced.A digital PGC demodulation system was designed and implemented.The frequency mixing and low pass filtering procedures were implemented using field programmable gate arrays(FPGA) and the following procedures were implemented using digital signal processor(DSP).Real-time demodulation experiment verified that a test signal with 5 kHz and 1 rad was successfully demodulated at 1 MHz sampling rate. |
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| Keywords: | interferometers fiber optic sensors phase modulation demodulation digital signal processing |
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