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Peak seeking and phase discrimination method

A phase detection and cross-correlation technology, applied in the field of peak detection and phase detection, can solve the problems of large computational load and poor real-time performance of the algorithm, and achieve the effects of improving real-time performance, high noise tolerance and reducing computational load.

Active Publication Date: 2018-09-14
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

[0005] The present invention provides a method for peak finding and phase identification to overcome the problems of large amount of computation and poor real-time performance of the algorithm in the prior art

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[0029] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] A peak-finding and phase-discrimination method provided by the present invention samples the analog signal and converts it into a digital sequence, finds the position of the maximum value point in the digital sequence, uses the frequency-adaptive raised cosine function as a template, and calculates the maximum value The signal near the point position is cross-correlation filtered, and the golden section method is used to continuou...

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Abstract

The invention relates to a peak seeking and phase discrimination method which is used for detecting the phase change of an analog signal. According to the method, a signal phase is determined throughfinding a signal peak position. The method comprises the phase discrimination processes: sampling and converting the analog signal into a digital sequence, finding out a maximum point position in thedigital sequence, taking a frequency adaptive raised cosine function as a window function, performing cross-correlation filtering on the signal nearby the maximum point position, continuously narrowing the maximum point position range by adopting a golden section method simultaneously and accurately re-positioning the maximum point position, namely the peak position. As the adopted the golden section method can continuously narrow the maximum point position range, the peak seeking and phase discrimination method has the characteristics of being small in computation burden and strong in real-time performance. In addition, due to the adoption of the cross-correlation filtering, the peak seeking and phase discrimination method has high tolerance to noise.

Description

technical field [0001] The invention relates to the technical field of signal processing and analysis, in particular to a method for peak finding and phase identification. Background technique [0002] The phase detection method is used in phase method laser ranging, laser interferometer, fiber optic gyroscope, laser Doppler measurement and other fields. Typical phase detection methods include Fourier transform method, phase shift method, correlation method and so on. The Fourier transform method is the spectrum analysis method, which uses the principle of discrete Fourier transform to transform the time-domain signal into the frequency domain, and realizes phase detection according to the phase-frequency characteristics of the signal. The Fourier transform method has serious spectrum leakage defects, and its measurement accuracy Limited by frequency resolution. The phase shift method uses the Hilbert transform to shift the signal by 90°, [0003] The phase demodulation i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00
CPCG01R25/00
Inventor 王伟李艳萍张雄星陈海滨王可宁胡锐
Owner XIAN TECHNOLOGICAL UNIV
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