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Direction of arrival (DOA) estimation method of virtual two-order array extension

A technology for estimation of direction of arrival and direction of arrival, applied in radio wave direction/deviation determination systems, direction finders for direction determination, direction finders using radio waves, etc., can solve the problem that the number of estimated sources is not resolved question

Inactive Publication Date: 2017-08-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

But this algorithm is only valid when the number of sources is less than half of the number of arrays, and the estimated number of sources has not been solved

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  • Direction of arrival (DOA) estimation method of virtual two-order array extension

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Embodiment Construction

[0037] In this embodiment, the number of array elements is M=2, and the uniform linear antenna array with array element spacing d=λ / 2 (λ is the signal wavelength) is taken as an example, and only two incoherent narrowband signal far-field scenarios are considered, and then the center frequency f c =70MHz, the number of independent experiments is N MC =50.

[0038] Step 1: Set the corresponding parameters according to the received signal and the structure of the antenna itself, and use the second-order Volterra filter structure to construct y(t);

[0039] Step 1-1: Without loss of generality, assume that the number of elements of the uniform linear array is M=2, the number of signal sources is P=2, and the signal incident angles are θ 1 =30°,θ 2 =33°, the array received signal can be expressed as:

[0040] x(t)=As(t)+n(t)

[0041] where x(t)=[x 1 (t),x 2 (t),...,x M (t)] T ,x m (t), m=1,...M represents the signal received by the mth array element. A=[a(θ 1 ), a(θ 2...

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Abstract

The invention discloses a direction of arrival (DOA) estimation method of virtual two-order array extension, belonging to the processing category of receiving an antenna array signal of a wireless transmission signal. In particular, the method is a method that a steering vector is constructed to be a virtual Volterra filter structure and the beamforming technology and the Lagrange multiplier method technology are combined to carry out direction of arrival (DOA) estimation. The steering vector is constructed to be the virtual Volterra filter structure and the beamforming technology and the Lagrange multiplier method technology are combined to carry out direction of arrival (DOA) estimation. According to the algorithm, the DOA estimation under the condition of an unknown number of signal sources can be realized and does not rely on subspace decomposition. The influence of the wrong estimation of the number of the signal sources on the performance of DOA estimation is avoided, the DOA estimation resolution ability is improved, and the computational complexity is reduced.

Description

technical field [0001] The invention belongs to the category of antenna array signal processing for receiving wireless transmission signals, specifically, it constructs a steering vector into a virtual Volterra filter structure and combines beamforming technology and Lagrangian multiplier method technology to perform direction-of-arrival (DOA) estimation method. Background technique [0002] In recent decades, array signal processing, as an important branch in the field of modern signal processing, has developed extremely rapidly. Has been widely used. The two main research directions of array signal processing are adaptive spatial filtering and DOA estimation. Adaptive array processing technology was produced earlier than DOA estimation, and has been widely used. On the contrary, although DOA estimation has developed rapidly in recent decades, the theory and technology of DOA estimation are still in rapid development, and it has become the main aspect of the development ...

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/143
Inventor 张瑛王琼汪婷静龙政斌赵华鹏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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