Dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method

A non-circular signal, distributed signal source technology, applied in radio wave measurement system, direction determination direction, complex mathematical operation and other directions, can solve the problems of complex parameter estimation and excessive calculation amount.

Inactive Publication Date: 2019-05-21
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

A two-dimensional coherent distributed source requires four parameters to describe, namely, azimuth and elevation, and the angular spread of the two (ie, angular deviation), so the parameter estimation becomes more complicated
Literature [L.Wan, G.Han, J.Jiang, and J.Jiang, "DOA estimation for coherently distributed sources considering circular and noncircular signal in

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  • Dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method
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  • Dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method

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[0047] Further illustrate the working process of the present invention below in conjunction with a specific implementation case:

[0048] Such as figure 1 As shown, the present invention provides a method for estimating DOA of coherent distributed non-circular signals based on dual parallel antenna arrays, the method comprising the following steps:

[0049] (1), assuming that there are K independent narrowband coherent distributed sources incident to the dual parallel antenna array, K≥1, based on the dual parallel antenna array, the output signal matrix W(t) of the array is constructed, the output signal matrix The form is: W(t)=DS(t)+N(t), wherein, S(t) is the signal vector, N(t) is the noise vector, is a generalized steering vector matrix with a rotation invariant relation, Φ 1 and Φ 2 are respectively the first incident information diagonal matrix and the second incident information diagonal matrix containing the center azimuth angle and center elevation angle informati...

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Abstract

The invention relates to a dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method, which belongs to the field of array signal processing. The two-dimensionalDOA estimation method for coherent distributed non-circular signals comprises steps: an array output matrix is calculated by using two parallel uniform linear arrays; by using the non-circular characteristics of a source, an extended output matrix is constructed; four selection matrices are set, and an extended steering vector array has rotational invariance; the covariance matrix of an extended array output matrix is calculated; the covariance matrix is subjected to eigenvalue decomposition to obtain signal subspace; an equivalent matrix is calculated, the equivalent matrix is subjected to eigenvalue decomposition respectively, eigenvalues are paired, and estimation on an azimuth angle and a pitch angle are realized. By using the non-circular characteristic of the signal, the number of array elements is extended virtually, and the estimation performance is improved.

Description

technical field [0001] The invention relates to a method for estimating DOA of a coherent distributed noncircular signal based on a double-parallel antenna array, belonging to the field of array signal processing. Background technique [0002] In the field of array signal processing, many classical DOA estimation algorithms assume that the target source is a point source, that is, the energy of the source is concentrated at a discrete angle. However, in the field of practical applications such as low-angle tracking radar, sonar imaging, ionospheric radio propagation, and mobile communication positioning, the scattering of the target signal makes the energy of the source reach the receiving end in a continuous direction within a certain range, which leads to signal loss. The angular spread of the source energy, at this time the target source cannot simply be considered as a point source, but a parameterized distributed source model needs to be established. The parameter esti...

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Application Information

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IPC IPC(8): G01S3/48G06F17/16
Inventor 林晴晴帅平刘波张学攀蒙静陈强
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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