Rapid phase discrimination method of frequency modulation continuous wave interference signal

A frequency-modulated continuous wave and interference signal technology, which is applied in the direction of radio wave reflection/re-radiation, radio wave measurement system, and utilization of re-radiation, can solve the problems of slow phase detection speed and large nonlinear error, and achieve phase detection accuracy High, eliminate phase error, improve the effect of target movement speed

Active Publication Date: 2020-01-03
XIAN TECHNOLOGICAL UNIV
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[0008] The present invention provides a fast phase detection method for frequency modulated continuous wave interfe...

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  • Rapid phase discrimination method of frequency modulation continuous wave interference signal
  • Rapid phase discrimination method of frequency modulation continuous wave interference signal
  • Rapid phase discrimination method of frequency modulation continuous wave interference signal

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[0031] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments have used associated similar element numbers. In the following embodiments, many details are described so that the present application can be better understood. However, those skilled in the art will readily recognize that some of the features may be omitted under different circumstances, or may be replaced by other elements, materials, and methods.

[0032] The present invention will be described in further detail below with reference to the accompanying drawings.

[0033] The design idea of ​​the present invention is: for the amplitude modulated interference signal, calculate the instantaneous amplitude and zero offset of the characteristic point position, and then according to the trend of the signal, use the arc cosine function to calculate the phase of the characteristic point,...

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Abstract

The invention relates to the technical field of signal processing and analysis, in particular to a rapid phase discrimination method of a frequency modulation continuous wave interference signal. Themethod comprises the following steps of rapidly calculating initial phase of the frequency modulation continuous wave interference signal, performing high-speed demodulation on the displacement of a target or physical quantities (temperature, pressure and the like) related to the displacement, and improving the precision and dynamic characteristics of a frequency modulation continuous wave interference system. The invention provides a rapid phase discrimination method of the frequency modulation continuous wave interference signals. The wave crest and trough of the interference signal are firstly positioned, and phases of multiple characteristics in the interference signal is calculated, and the initial phase of the interference signal is calculated through the phases of the characteristicpoints. The method disclosed by the invention is rapid in phase discrimination speed, strong in practicability, and capable of improving an applicable range on the target movement speed by the high-frequency continuous wave interference system; and meanwhile, the method cannot be influenced by the strength modulation ad nonlinear frequency modulation of the laser, and the phase discrimination precision is high.

Description

technical field [0001] The invention relates to the technical field of signal processing and analysis, in particular to a fast phase identification method, and further to a fast phase identification method for a frequency modulated continuous wave interference signal. Background technique [0002] Frequency-modulated continuous wave (FMCW) laser interference technology adopts the principle of laser frequency-modulated continuous wave interference, which can measure displacement, as well as various physical quantities such as strain, stress, temperature, etc. that are related to displacement. The frequency-modulated continuous wave interference displacement sensor realizes the continuous linear frequency modulation of the laser output by modulating the driving current of the semiconductor laser. The current modulation waveform can be a sawtooth wave or a triangular wave. A part of the linear frequency modulated laser is reflected back to the detector inside the optical path ...

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Application Information

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IPC IPC(8): G01S13/58G01S13/88G01S7/41
CPCG01S13/584G01S13/88G01S7/415
Inventor 张雄星郑刚高明刘卫国孙彬
Owner XIAN TECHNOLOGICAL UNIV
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