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Distance measuring method of frequency modulated continuous wave radar system

A frequency-modulated continuous wave and radar system technology, which is used in radio wave measurement systems, radio wave reflection/re-radiation, measurement devices, etc. and other problems, to achieve the effect of less calculation, improved ranging accuracy, and simplified algorithm

Active Publication Date: 2014-05-07
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The main technical defect: due to ZFFT, CZT and zero-padding spectrum refinement, discrete Fourier transform is required, and the interference of signal sidelobe and main lobe due to spectrum leakage will lead to misjudgment and affect the accuracy of the algorithm. This algorithm requires a large amount of calculation

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  • Distance measuring method of frequency modulated continuous wave radar system
  • Distance measuring method of frequency modulated continuous wave radar system
  • Distance measuring method of frequency modulated continuous wave radar system

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0027] The FMCW (Frequency Modulation Continuous Wave) radar system ranging algorithm of shift energy normalization proposed by the present invention is a kind of novel ranging method based on Parseval energy conservation and discrete Fourier transform properties. Theoretical verification is carried out, and the results of theoretical analysis and simulation experiments prove the validity of the method.

[0028] figure 1 Shown as a flow chart of a ranging method for a frequency modulated continuous wave radar system, the method includes steps:

[0029] Step S1: Perform discrete Fourier spectrum calculation on the intermediate frequency signal collected by the frequency modulation continuous wave radar system to obtain th...

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Abstract

The invention discloses a distance measuring method of a frequency modulated continuous wave radar system. The method comprises the steps of S1, conducting discrete Fourier spectrum calculation on intermediate frequency signals collected by the frequency modulated continuous wave radar system, and obtaining a rough-calculated intermediate frequency signal frequency and distance corresponding to a spectrum peak spectral line, S2, according to the shifting characteristics of discrete Fourier transformation, obtaining shifted intermediate frequency signal frequency spectrums, S3, conducting normalized energy summation on the shifted intermediate frequency signal frequency spectrums, S4, judging whether the shifting reaches one period or not, repeating the S2 and the S3 if the shifting does not reach one period, and executing the S5 if the shifting reaches one period, S5, finding the maximum value or the minimum value of shifting normalized energy, and the shifting frequency corresponding to the maximum value or the minimum value of the energy, and combining with the S1 to calculate and obtain the distance after shifting and the shifting distance, and S6, according to the distance after shifting and the shifting distance in the S5, calculating the target distance.

Description

technical field [0001] The invention belongs to the technical field of frequency modulation continuous wave (FMCW) radar system distance measurement, in particular, it is used for non-contact distance measurement due to the influence of environmental factors and the like. This method can be used in the distance measurement calculation of the liquid level gauge, and can also be used in the distance measurement calculation of the material level, and has the advantages of high calculation accuracy and small interference. Background technique [0002] LFM continuous wave radar has many advantages that other radars do not have: no distance blind zone, high distance resolution and low radiation power. Measuring distance with radar is a non-contact measurement, so it will not cause damage to the target object, and can be used in many special environments to achieve high-precision measurement. The principle is: send a linearly transformed frequency-modulated continuous wave to the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/32
CPCG01S7/352G01S13/32G01S7/356
Inventor 陈秀伟张文鑫刘小军柳青唐传军张锋方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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