| 全数字PGC解调的载波相位超前技术 |
| |
| 引用本文： | 蓝天,张春熹,李立京,罗光明,李琛.全数字PGC解调的载波相位超前技术[J].光电工程,2008,35(7):49-52. |
| |
| 作者姓名： | 蓝天 张春熹 李立京 罗光明 李琛 |
| |
| 作者单位： | 北京航空航天大学,仪器科学和光电工程学院,北京,100083 |
| |
| 摘 要： | 分析相位载波(PGC)解调中载波相位延迟产生的影响,表明载波相位延迟引起解调输出幅值衰减,严重时导致解调输出恒为零.提出采用载波相位超前技术消除其不利影响.在全数字PGC 解调系统中,采用余弦查找表(LUT)方式生成载波数字波形,通过在LUT 的地址输入端引入固定偏置,生成相位超前的载波,补偿解调系统中固有的延迟,达到消除不利影响的目的.固定偏置可以通过对解调系统进行分析和测试获得.实验结果表明,载波相位超前技术是有效的.
|
| 关 键 词： | 干涉仪 光纤传感器 相位载波 相位超前 全数字 解调系统 载波相位 Demodulation Digital Technique Advance Phase 结果 实验 测试 相位延迟 补偿 偏置 固定 输入端 数字波形 查找表 余弦 严重 |
| 收稿时间： | 2007/11/20 |
Carrier Phase Advance Technique for Digital PGC Demodulation |
| |
| LAN Tian,ZHANG Chun-xi,LI Li-jing,LUO Guang-ming,LI Chen.Carrier Phase Advance Technique for Digital PGC Demodulation[J].Opto-Electronic Engineering,2008,35(7):49-52. |
| |
| Authors: | LAN Tian ZHANG Chun-xi LI Li-jing LUO Guang-ming LI Chen |
| |
| Affiliation: | LAN Tian,ZHANG Chun-xi,LI Li-jing,LUO Guang-ming,LI Chen ( School of Instrument Science , Opto-electronics Engineering,Beijing University of Aeronautics , Astronautics,Beijing 100083,China ) |
| |
| Abstract: | Carrier phase delay resulted in output signal fading in the Phase Generated Carrier (PGC) demodulation, and in critical conditions, the output signal vanished. A carrier phase advance technique was developed to solve this problem. The digital carrier waveform was generated using cosine waveform Look-up-table (LUT) in the digital PGC demodulation system. An address offset was introduced at the LUT input port and a phase-advanced carrier was generated. The phase advance completely compensated the constant del... |
| |
| Keywords: | interferometer fiber optic sensor phase generated carrier phase advance |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
