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Broadband signal super-resolution direction finding method and broadband signal super-resolution direction finding device based on sparse reconstruction in continuous domain

A wideband signal and sparse reconstruction technology, which is applied to measuring devices, direction finders using electromagnetic waves, direction finders using radio waves, etc., can solve the problems of low estimation accuracy and slow implementation speed of broadband signal super-resolution direction finding , to achieve good application prospects and value, parallel processing, high precision, and fast calculation speed

Inactive Publication Date: 2015-09-30
HEILONGJIANG UNIV
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Problems solved by technology

[0006] The present invention aims to solve the problems of low accuracy and slow implementation speed of wideband signal super-resolution direction finding estimation realized by the existing sparse reconstruction method in the discrete domain

Method used

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  • Broadband signal super-resolution direction finding method and broadband signal super-resolution direction finding device based on sparse reconstruction in continuous domain
  • Broadband signal super-resolution direction finding method and broadband signal super-resolution direction finding device based on sparse reconstruction in continuous domain
  • Broadband signal super-resolution direction finding method and broadband signal super-resolution direction finding device based on sparse reconstruction in continuous domain

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specific Embodiment approach 1

[0026] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this embodiment, the wideband signal super-resolution direction finding method realized by sparse reconstruction in the continuous domain described in this embodiment, the specific steps of this method are:

[0027] Step 1: Use a broadband uniform linear array composed of M broadband omnidirectional array elements to receive N far-field broadband signals s n(t), obtaining the output signal y(t) of the antenna array; n=1,2,...,N, wherein M and N are positive integers;

[0028] Step 2: For N far-field broadband signals s n (t) perform weighted summation to obtain the weighted sum s(t) of the far-field broadband signal, perform Fourier transform on the weighted sum s(t) of the far-field broadband signal, and obtain the frequency domain signal x(f k );

[0029] Step 3. Perform Fourier transform on the array output signal y(t) obtained in step 1 to obtain the frequency domain signal Y(f k ), fre...

specific Embodiment approach 2

[0036] Specific embodiment 2. This embodiment is a further description of the broadband signal super-resolution direction finding method realized by sparse reconstruction in the continuous domain described in specific embodiment 1. In this embodiment: step 1 obtains the output signal y( The expression of t), with one array element as the phase reference point:

[0037] y ( t ) = y 1 ( t ) . . . y m ( t ) ...

specific Embodiment approach 3

[0041] Specific embodiment three. This embodiment is a further description of the broadband signal super-resolution direction finding method implemented by sparse reconstruction in the continuous domain described in specific embodiment one. In this embodiment: the far-field broadband signal weighting described in step two and s(t) and its frequency domain signal x(f k )for:

[0042] s ( t ) = Σ n = 1 N s n ( t ) δ τ [ n ] - - - ( 3 )

[0043] x ( f ...

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Abstract

The invention discloses a broadband signal super-resolution direction finding method and a broadband signal super-resolution direction finding device based on sparse reconstruction in a continuous domain, and belongs to the field of signal estimation and signal processing. The problems of low estimation accuracy and low implementation speed of existing broadband signal super-resolution direction finding based on sparse reconstruction in a discrete domain are solved. Sampling frequency points G are divided into W groups, each group includes G / W frequency points, an estimated value of the signal arrival direction is solved by the broadband signal super-resolution direction finding method based on sparse reconstruction in the continuous domain, the average value of estimated values corresponding to the G / W frequency points in each group are taken as an estimated value of each group, and the average value of the estimated values of the W groups is taken as a final estimated result. Each digital signal processor processes a set of observation data and averages processed results to acquire a final result. The broadband signal super-resolution direction finding method and the broadband signal super-resolution direction finding device are applicable to broadband signal super-resolution direction finding based on sparse reconstruction in the continuous domain.

Description

technical field [0001] The invention belongs to the field of signal estimation and signal processing. Background technique [0002] Sparse reconstruction-like direction finding method is a novel super-resolution direction finding method emerging in recent years. Sparse reconstruction belongs to the category of compressed sensing, and has had an important impact in many applied science fields, such as remote sensing imaging, coding, face recognition, ultra-wideband signal processing, etc. Candes proposed the Restricted Isometry Property (RIP) in 2006, which mathematically proved the conditions for the establishment of the compressed sensing method, and this criterion has also become a criterion that must be followed by the sparse reconstruction theory. Blacquiere, G et al. discussed the joint sparsity of wideband array signals, but did not give a better super-resolution direction finding method using joint sparsity. The earliest sparse reconstruction method was only used to...

Claims

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Application Information

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IPC IPC(8): G01S3/14G01S3/782
CPCG01S3/143G01S3/782
Inventor 甄佳奇李彦超王志芳
Owner HEILONGJIANG UNIV
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