FMCW Radar Range Velocity Joint Estimation Method Based on All-Phase Fourier Transform

A Fourier transform and all-phase technology, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve problems such as poor estimation accuracy, improve frequency estimation accuracy, improve estimation accuracy, and reduce computational complexity degree of effect

Active Publication Date: 2022-05-27
HARBIN ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is: for the problem of poor estimation accuracy of FMCW radar to target distance and velocity in the prior art, propose a kind of FMCW radar range-velocity joint estimation method based on all-phase Fourier transform

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  • FMCW Radar Range Velocity Joint Estimation Method Based on All-Phase Fourier Transform
  • FMCW Radar Range Velocity Joint Estimation Method Based on All-Phase Fourier Transform
  • FMCW Radar Range Velocity Joint Estimation Method Based on All-Phase Fourier Transform

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specific Embodiment approach 1

[0049] Specific implementation mode 1: refer to figure 1 and figure 2 Specifically describing this embodiment, the method for joint estimation of FMCW radar range and velocity based on full-phase Fourier transform described in this embodiment includes the following steps:

[0050] Step 1: use the transmitting antenna to transmit M FM pulse signals to the outside in turn;

[0051] Step 2: the receiving antenna receives all echo pulse signals of all targets, that is, M echo pulse signals, and performs digital down-conversion processing on the M echo pulse signals to obtain an echo intermediate frequency signal matrix;

[0052] Step 3: perform full-phase Fourier transform spectrum processing on each row vector in the echo intermediate frequency signal matrix, obtain the full phase spectrum of each echo intermediate frequency pulse, and form an echo intermediate frequency signal spectrum matrix;

[0053] Step 4: Discrete Fourier transform is performed on each column vector in t...

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Abstract

The FMCW radar range and velocity joint estimation method based on all-phase Fourier transform relates to the technical field of radar signal processing. Aiming at the problem of poor estimation accuracy of target distance and velocity by FMCW radar in the prior art, the present invention proposes a method based on apFFT The three-point frequency deviation estimator can estimate the frequency deviation of the spectral peak from the full-phase spectrum of the signal sequence, which improves the frequency estimation accuracy of the signal compared with the simple apFFT algorithm; the present invention avoids the interpolation of the full-phase spectrum Calculation and iterative calculation, compared with Li-algorithm, effectively reduces the computational complexity of the algorithm; FMCW radar depends on the intermediate frequency frequency and phase estimation of the echo signal to the target distance and speed detection, the present invention improves the echo signal by using apFFT The estimation accuracy of the phase is improved by using the three-point frequency deviation estimator to improve the estimation accuracy of the echo signal frequency, thereby improving the estimation accuracy of the FMCW radar to the target distance and speed.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to an FMCW radar range-velocity joint estimation method based on full-phase Fourier transform. Background technique [0002] Frequency modulation continuous wave (FMCW) radar has the advantages of low transmission power, simple structure, small size and light weight, and is widely used in the fields of unmanned driving, industrial measurement, gesture recognition and so on. However, in the multi-target scenario, the spectral leakage and the fence effect of discrete Fourier transform in the echo signal of FMCW radar will increase the measurement error of the frequency and phase of the echo signal, and reduce the measurement accuracy of the target distance and speed. [0003] In response to such problems, scholars have proposed a series of frequency correction theories based on DFT, including ratio correction method, phase correction method and continuous refinement me...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S13/58
CPCG01S7/41G01S7/415G01S13/584
Inventor 王伟黄耀辉薛冰黄平李欣董福王
Owner HARBIN ENG UNIV
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