Chirp signal parameter estimating method based on sparse constraint

A linear frequency modulation signal and parameter estimation technology, applied in the field of communication, can solve the problem of low estimation accuracy, achieve the effect of improving computing efficiency, reducing calculation amount, and outstanding angle detection effect

Active Publication Date: 2015-09-02
XIDIAN UNIV
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Problems solved by technology

For example, Tang Jiang's paper "Research on FRFT-based LPI Radar Signal Parameter Estimation Method", School of Navigation and Aerospace Target Engineering, PLA Info

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  • Chirp signal parameter estimating method based on sparse constraint
  • Chirp signal parameter estimating method based on sparse constraint
  • Chirp signal parameter estimating method based on sparse constraint

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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] Reference figure 1 The specific implementation steps of the present invention are as follows:

[0034] Step 1. Obtain the echo signal.

[0035] Radar emits chirp signal: s ( t ) = Aexp ( j 2 π ( f 0 t + 1 2 kt 2 ) ) , Obtain the echo signal: x(t)=s(t-t 0 )+ω(t), where t 0 Is the relative time delay of signal propagation caused by distance, ω(t) is the mean value is 0, and the variance is δ 2 Gaussian white noise, A is the amplitude of the chirp signal, f 0 Is the starting frequency of the chirp signal, and k is the frequency modulation slope.

[0036] Step 2. Obtain discrete signals.

[0037] Discretely sample the received echo signal x(t) to obtain the discrete signal x(n):

[0038] x ( n ) = Aexp ( j 2 π ( f 0 ( nt s - t 0 ) + 1 2 k ( ...

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Abstract

The invention discloses a chirp signal parameter estimating method based on sparse constraint. The invention mainly solves problems of low resolution rate and large calculating amount of a prior method. The technical scheme includes that (1) obtaining a projection spectrum by utilizing the sparsity of an object and according to a Radon-Ambiguity converter technique; (2) performing angle division on an angle measurement range and designing a sparse matrix of two-dimension projection; (3) constructing a relational expression by utilizing the projection spectrum and sparse matrix; (4) obtaining a high resolution angle spectrum by solving the relational expression; (5) performing peak value detection of the angle spectrum by using a threshold value comparing method and obtaining angle values corresponding to signals; (6) acquiring frequency modulating value through calculation based on the angle values. The method provided by the invention has advantages of being small in calculating amount and high resolution rate and can be applied to communication and information processing systems.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for estimating parameters of linear frequency modulation signals, which can be used for parameter estimation of linear frequency modulation signals in signal processing. Background technique [0002] As a typical non-stationary signal with large time-frequency band product, chirp signal is widely used in various information systems. From the perspective of electronic warfare and electronic jamming, in order to solve the contradiction between the operating range and distance resolution and improve the concealment of the signal, the chirp signal is usually used. Therefore, the detection and parameter estimation of linear frequency modulation signals have become the focus of electronic research. [0003] At present, the methods of linear frequency modulation signal parameter estimation include Radon-Ambiguity transform method and fractional Fourier transform FR...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/412
Inventor 赵光辉谭萌石光明孙爽爽沈方芳
Owner XIDIAN UNIV
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