Linear frequency modulation (FM) signal parameter estimation method based on small-wave-packet denoising and power spectral entropy

A linear frequency modulation signal and parameter estimation technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as large amount of calculation, complex algorithm, and difficult engineering implementation, and achieve the effect of small amount of calculation and real-time estimation

Inactive Publication Date: 2013-10-30
HARBIN ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a linear frequency modulation signal parameter estimation method based on wavelet packet denoising and power spectrum entropy that can overcome the shortcomings of existing methods such as large amount of calculation, complex algorithm, and difficulty in engineering implementation

Method used

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  • Linear frequency modulation (FM) signal parameter estimation method based on small-wave-packet denoising and power spectral entropy
  • Linear frequency modulation (FM) signal parameter estimation method based on small-wave-packet denoising and power spectral entropy
  • Linear frequency modulation (FM) signal parameter estimation method based on small-wave-packet denoising and power spectral entropy

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Embodiment Construction

[0047] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0048] combine Figure 1-9 , the signal model of the LFM signal is:

[0049]

[0050] Among them, f 0 is the center frequency of the signal, k is the FM slope of the signal, and x(t) represents the LFM signal.

[0051] The LFM signals used in the realization of the project are of finite length:

[0052]

[0053]

[0054] The envelope of the finite LFM signal is a rectangular function, A is the amplitude of the rectangular function, the time width of the rectangular function is T, and the bandwidth B is the signal bandwidth, the time-width-bandwidth product The instantaneous frequency ω(t) has a linear transformation relationship with time:

[0055]

[0056] The LFM signal parameter estimation method to which the present invention belongs, the complete calculation process is as follows figure 1 Shown: LFM signal simulation parameter setting: bandw...

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Abstract

The invention aims at providing a linear frequency modulation (FM) signal parameter estimation method based on small-wave-packet denoising and power spectral entropy, which includes the following steps: denoising signals in a multi-dimension small-wave-packet mode, and determining small-wave-packet function and small-wave-packet decomposition level; calculating power spectral entropy of signals denoised in a small-wave-packet mode, and setting an entropy feature data base of linear FM signals with different FM slope under the condition of different signal to noise ratios; carrying out interpolation operation for obtained discretized entropy features; fitting the curve after interpolation of a cubic spline function with a polynomial function, and obtaining FM slop of linear FM signals under the condition of different signal to noise ratios and relational expression with input entropy features; and estimating FM slop of linear frequency modulation (LFM) signals received by a receiver by utilizing the fit expression. The linear FM signal parameter estimation method based on small-wave-packet denoising and power spectral entropy is small in calculated amount and capable of estimating FM slop of LFM in real time under the premise of meeting the requirement for parameter estimation accuracy.

Description

technical field [0001] The invention relates to a signal estimation method in the technical field of radar signal processing. Background technique [0002] The analysis and parameter estimation of radar signal intrapulse characteristic parameters are the prerequisites for radar countermeasures. As a typical non-stationary signal, Linear Frequency Modulation (LFM) has been widely used in radar, sonar and other fields. It is a pulse compression signal with a large time-width-bandwidth product obtained through nonlinear phase modulation. The precise estimation of the target has always been a hot issue in the field of radar signal processing, and it is also of great significance to the detection and identification of targets in radar electronic reconnaissance systems. The key characteristic parameters of the linear frequency modulation signal are the frequency modulation slope and the starting frequency, and the present invention is aimed at the estimation of the frequency modu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02
Inventor 李一兵葛娟林云叶方李靖超杨蕊李一晨田雪宜
Owner HARBIN ENG UNIV
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