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�������պ����ѧѧ�� 2008, Vol. 34 Issue (05) :503-506    DOI:
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Multirate digital phase generated carrier demodulation
Lan Tian, Zhang Chunxi, Li Lijing, Han Xiaojuan*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ������λ�ز�(PGC,Phase Generated Carrier)��������ڵ��ź�Ƶ�ʷ�Χ,���������ʽ������,����߲���Ƶ���µ�ʵʱȫ����PGC�������.�Ը�������źŲ��ø߲����ʽ���ģ��ת��,��߽������Ͷ�̬��Χ.�Ի�Ƶ��˺͵�ͨ�˲���Ļ��ڲ��ý��Ͳ����ʴ���,����ʵʱ�����źŴ����������.��Ʊ������ȫ����PGC���ϵͳ,�����ֳ��ɱ��������(FPGA,Field Programmable Gate Arrays)����ʵ�ֻ�Ƶ��˺͵�ͨ�˲�����,���������źŴ�����(DSP, Digital Signal Processor)ʵ�ֺ����������,ʵ�ֲ����ʸߴ睊1��MHz����ʵʱ���.ʵ��������Ƶ��Ϊ5��kHz������Ϊ1��rad�ı����źſ��Ա���Ч���.
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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.
Keywords�� interferometers   fiber optic sensors   phase modulation   demodulation   digital signal processing     
Received 2007-04-20;
About author: �� ��(1978��),��,�ӱ�ʯ��ׯ��,��ʿ��,lantian_buaa@eyou.com.
����, �Ŵ���, ������, ������.�������ȫ������λ�ز��������[J]  �������պ����ѧѧ��, 2008,V34(05): 503-506
Lan Tian, Zhang Chunxi, Li Lijing, Han Xiaojuan.Multirate digital phase generated carrier demodulation[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(05): 503-506
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2008/V34/I05/503
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