Amplitude normalization method of frequency modulated continuous wave interference signals

A frequency-modulated continuous wave and interference signal technology, which is applied to radio wave measurement systems and instruments, can solve the problems of high signal-to-noise ratio and poor real-time performance of interference signals, so as to improve stability and adaptability, improve accuracy, reduce The effect of calculation volume

Active Publication Date: 2019-06-11
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

[0006] The present invention provides a method for normalizing the amplitude of the FM continuous wave interference signal, to overcome

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  • Amplitude normalization method of frequency modulated continuous wave interference signals
  • Amplitude normalization method of frequency modulated continuous wave interference signals
  • Amplitude normalization method of frequency modulated continuous wave interference signals

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[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] A frequency modulation continuous wave interference signal amplitude normalization method provided by the present invention uses a sampling unit to sample the interference signal within a modulation period and converts it into a digital signal, and performs amplitude normalization on the frequency modulation continuous wave interference signal according to the PI characteristics of the semiconductor laser. value demodulation.

[0029] It is characterized in that the amplitude demodulation of the amplitude modulation of the interference signal is performed according to the modulation current of the semiconductor laser, and at the same time, the adaptive gain is performed according to the effective value of the interference signal, so that the interference signal is transformed into an equal-amplitude oscillation signal with a constant amplitude.

[0030...

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Abstract

The invention discloses an amplitude normalization method of frequency modulated continuous wave interference signals, which is used for correcting the interference signals. The interference signals are corrected into equal-amplitude oscillation signals with constant amplitudes, and meanwhile, the frequency and phase attributes of the interference signals are not changed. The method comprises thesteps of sampling the interference signals and converting the interference signals into digital signals; carrying out amplitude demodulation on the interference signals according to a PI characteristic of a semiconductor laser; and carrying out adaptive gain on the signals according to effective values of the interference signals to obtain the equal-amplitude oscillation interference signals withthe constant amplitudes. According to the method, the amplitudes of the interference signals are not influenced by factors such as current modulation of the semiconductor laser, a detection distance and the like; and the stability of a frequency modulated continuous wave interference system and the precision of carrying out phase discrimination on the interference signals can be improved.

Description

technical field [0001] The invention relates to the technical field of signal processing and analysis, in particular to an amplitude normalization method, and further relates to a frequency modulation continuous wave interference signal amplitude normalization method. Background technique [0002] Frequency-modulated continuous wave (FMCW) laser interferometry technology originated from frequency-modulated continuous wave radar. It takes the optical path as the measurement object, and can directly or indirectly realize the measurement of various physical quantities such as displacement, strain, stress, temperature, angular velocity, current, and magnetic field. The FM continuous wave optical fiber displacement sensor is based on the principle of FM continuous wave interference. The frequency linearly modulated semiconductor laser is used to emit optical frequency linearly modulated light waves. Through the optical fiber Fabry-Perot interferometer structure, due to the optical...

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Application Information

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IPC IPC(8): G01S7/48
Inventor 张雄星郑刚井李强白浪王欢郭竹睿
Owner XIAN TECHNOLOGICAL UNIV
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