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Linear frequency modulation continuous wave radar pre-detection parameter estimation method based on FFT

A technology of parameter estimation and linear frequency modulation, applied in radio wave measurement systems, calculations, complex mathematical operations, etc., can solve problems such as "matching" processing, unknown target parameters, etc., and achieve effective target distance and Doppler frequency shift estimation , the effect of reducing the complexity of the solution

Pending Publication Date: 2021-12-07
江苏云禾峰智能科技有限公司
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Problems solved by technology

[0006] Purpose of the invention: Aiming at the problem that conventional radar signal processing cannot be "matched" due to unknown target parameters, the present invention provides an FFT-based method for estimating parameters of LFM continuous wave radar before detection, which can be applied to LFM continuous wave radar Signal Processing in Scenarios

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  • Linear frequency modulation continuous wave radar pre-detection parameter estimation method based on FFT
  • Linear frequency modulation continuous wave radar pre-detection parameter estimation method based on FFT
  • Linear frequency modulation continuous wave radar pre-detection parameter estimation method based on FFT

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Embodiment Construction

[0018] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] The present invention is applicable to linear frequency modulation continuous wave radar signal, with reference to figure 1 , the method includes the following steps:

[0020] Step 1) Divide the grid points in the fast time domain and the slow time domain, establish an observation model of the received signal, and estimate the distance and Doppler parameters of all grid points corresponding to the target based on the model.

[0021] For LFM continuous wave radar signal, its received signal can be expressed as a K×N data matrix Y, and its element y(k, n) can be expressed as:

[0022]

[0023] Among them, 0≤p≤P-1, P is the target number, σ s，p is the random complex amplitude, f r，p =-μτ p Indicates the difference frequency, representing the range of the pth target. μ is the frequency modulation slope, τ p (t) is the delay of the ...

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Abstract

The invention provides a linear frequency modulation continuous wave radar pre-detection parameter estimation method based on FFT. The method comprises the following steps: carrying out grid point division of a fast time domain and a slow time domain, building an observation model of a received signal, and carrying out distance and Doppler parameter estimation of all grid points based on the model; removing coupling among the grid points based on a weighting matrix, and converting a joint estimation problem of target parameters corresponding to all the grid points into individual estimation of each grid point target; establishing a cost function of a parameter estimation problem, and obtaining an analytic solution of parameter estimation based on first-order Taylor approximation; calculating a first-order derivative and a second-order derivative in a parameter estimation analytic solution based on FFT, and obtaining a parameter estimation result on the basis of the first-order derivative and the second-order derivative. According to the method, target parameters can be quickly estimated before target detection, so that accurate matching signal processing based on known parameters becomes possible.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a parameter estimation method before detection of a linear frequency modulation continuous wave radar. Background technique [0002] Signal processing and target detection are the basic capabilities of radar. The conventional radar signal processing method is to perform matched filtering first, improve the target signal-to-noise ratio, then perform target detection, and then perform target parameter estimation. In fact, there is a large signal processing loss in this signal processing flow. The reason is that it is difficult to achieve accurate "matching" processing because the parameters (distance, speed, etc.) of each target are unknown when processing pulse compression and coherent accumulation. Taking the linear frequency modulation continuous wave radar as an example, a method of directly performing two-dimensional FFT (fast Fourier transform, fast Fourier transform) ...

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Application Information

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IPC IPC(8): G01S7/02G06F17/11G06F17/14
CPCG01S7/02G06F17/142G06F17/11
Inventor 晋本周王燕申宇彤李建峰张小飞吴启晖
Owner 江苏云禾峰智能科技有限公司
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