FMCW radar distance and speed joint estimation method based on all-phase Fourier transform

A technology of Fourier transform and joint estimation, applied in the field of joint estimation of FMCW radar range and velocity based on full-phase Fourier transform, can solve problems such as poor estimation accuracy, reduce computational complexity, avoid interpolation calculation and iterative calculation Effect

Active Publication Date: 2021-03-19
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 v

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  • FMCW radar distance and speed joint estimation method based on all-phase Fourier transform
  • FMCW radar distance and speed joint estimation method based on all-phase Fourier transform
  • FMCW radar distance and speed joint estimation method based on all-phase Fourier transform

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specific Embodiment approach 1

[0048] Specific implementation mode one: refer to figure 1 and figure 2Specifically illustrate this embodiment, the FMCW radar range velocity joint estimation method based on all-phase Fourier transform described in this embodiment, comprises the following steps:

[0049] Step 1: using the transmitting antenna to transmit M frequency-modulated pulse signals outward in sequence;

[0050] 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;

[0051] Step 3: performing full-phase Fourier transform spectrum processing on each row vector in the echo intermediate-frequency signal matrix to obtain the full-phase spectrum of each echo intermediate-frequency pulse to form an echo intermediate-frequency signal spectrum matrix;

[0052] Step 4: Perform discrete Fourier transform processing on each co...

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Abstract

The invention discloses an FMCW radar distance and speed joint estimation method based on all-phase Fourier transform, and relates to the technical field of radar signal processing, and provides a three-point frequency deviation estimator based on apFFT in order to solve the problem that in the prior art, an FMCW radar is poor in estimation precision of the target distance and speed. A three-pointfrequency deviation estimator based on apFFT is provided, the frequency deviation of a spectral peak can be estimated from an all-phase frequency spectrum of a signal sequence, and compared with a simple apFFT algorithm, the frequency estimation precision of the signal is improved; interpolation calculation and iterative calculation of an all-phase frequency spectrum are avoided, and the calculation complexity of the algorithm is effectively reduced compared with Li-algorithm; and the detection of the FMCW radar on the target distance and speed depends on the estimation of the intermediate frequency and phase of the echo signal, the estimation precision of the phase of the echo signal is improved by using the apFFT, and the estimation precision of the frequency of the echo signal is improved by using the three-point frequency deviation estimator, so that the estimation precision of the FMCW radar on the target distance and speed is improved.

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 all-phase Fourier transform. Background technique [0002] Frequency modulation continuous wave (FMCW) radar has the advantages of low transmission power, simple structure, small size, light weight, etc. It is widely used in unmanned driving, industrial measurement, gesture recognition and other fields. However, in the multi-target scenario, the spectrum leakage in the FMCW radar echo signal and the fence effect of the discrete Fourier transform will increase the measurement error of the frequency and phase of the echo signal, and reduce the measurement accuracy of the target distance and velocity. [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 metho...

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Application Information

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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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