A ranging method for frequency modulation continuous wave radar system
A frequency-modulated continuous wave and radar system technology, applied in radio wave measurement systems, measurement devices, radio wave reflection/re-radiation, etc., can solve the problems of misjudgment of the maximum value, small difference in spectral line amplitude, and affecting algorithm accuracy. To achieve the effect of ensuring reliability and improving accuracy
Active Publication Date: 2016-03-02
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0005] The most important technical defect of the existing technology: Since ZFFT, CZT and zero-padding spectrum refinement need to perform discrete Fourier transform, the spectral amplitude of non-integer multiples is calculated by interpolation, but the spectral line amplitudes near the maximum value are quite different. Small, due to the influence of spectrum leakage and noise on the spectrum, it is easy to misjudgment the maximum value and affect the accuracy of the algorithm. For this reason, the present invention provides a method for measuring the frequency modulation continuous wave radar system
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[0023] 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.
[0024] The non-uniform spectrum refinement FMCW ranging algorithm proposed by the present invention is a new type of ranging method based on the distribution interval of the intermediate frequency signal frequency after DFT transformation to determine the frequency. This method has verified the correctness of the theory through experimental simulation. Theoretical analysis And the simulation experiment results prove the effectiveness of the method.
[0025] Please refer to figure 1 A flow chart showing the ranging method of the shifted energy normalized FM continuous wave radar system of the present invention, the method includes the following steps
[0026] Step S1: Determine the maximum spectral line number and the sec...
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The present invention provides a method for measuring distance in a frequency modulation continuous wave radar system. The method includes steps: step S1 performs discrete Fourier transform on the discrete intermediate frequency signal collected by the frequency modulation continuous wave radar system, and finds the maximum value of the discrete spectrum, the spectral line number km and the discrete Spectral line number kc of the next largest value; step S2, if the number kc=km-1, enter step S4; if kc≠km-1, enter step S3; step S3 shifts the frequency domain of the discrete intermediate frequency signal to the right by Δf / 2 , make the shifted spectral line number km and kc satisfy kc=km-1, where Δf is the frequency resolution of N-point discrete Fourier transform; step S4 reduces the discrete Fourier transform of one sampling point to the discrete intermediate frequency signal , find the discrete spectrum maximum spectral line number k′m; step S5 judges the discrete spectral maximum spectral line number k′m, if k′m=km repeat step S4, if k′m≠km, k′m= km-1, enter step S6; step S6 calculates the distance interval (R1, R2) between the measured radar and the target according to the sampling points of the discrete Fourier transform, and then combines the distance relational expression, then the measured distance between the measured radar and the target The value is R'=(R1+R2) / 2.
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 for the distance measurement calculation of the liquid level gauge, and can also be used for the distance measurement calculation of the material level, and has the advantages of high calculation accuracy, small calculation amount, and good anti-noise performance. 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 frequ...
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IPC IPC(8): G01S13/32
CPCG01S7/352G01S13/32G01S7/356
Inventor 刘小军张文鑫陈秀伟柳青唐传军张锋方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI