Digital phase-sensitive detection method and system based on FPGA

The invention relates to a digital phase-sensitive detection method and system based on an FPGA, and belongs to the technical field of signal processing. According to the invention, a sine square wavesignal and a cosine square wave signal which have the same frequency as a signal to be detected are...

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Bibliographische Detailangaben
Hauptverfasser: LIU LIMIN, JI QIANQIAN, DU JUAN, ZHAO YONGGANG, HUA XINJUN, CHEN CHANJUAN, ZHAO JING, LI JIANWEI, BAI BINYAN, RAN LIMIN, LI GONGQIANG, HU TING, WANG DAN
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention relates to a digital phase-sensitive detection method and system based on an FPGA, and belongs to the technical field of signal processing. According to the invention, a sine square wavesignal and a cosine square wave signal which have the same frequency as a signal to be detected are generated through an FPGA, the sine square wave signal and the cosine square wave signal serve as reference signals and are subjected to correlation operation with the signal to be detected respectively, results of the two paths of correlation operation are subjected to modulo operation, the modulooperation result is multiplied by a coefficient, and the obtained result is used as the amplitude of the to-be-detected signal, so that the amplitude of the useful signal is extracted from the to-be-detected signal. According to the invention, the square wave is used as the reference signal during detection, and compared with the sine wave used as the reference signal, the control is simplified,the calculation efficiency