Extension aperture two-dimensional combined diagonalization DOA estimation method

A technology of joint diagonalization and DOA, which can be used in radio wave direction/bias determination systems, direction finders using radio waves, etc., and can solve problems such as singularity and large computational complexity.

Active Publication Date: 2018-11-23
TIANJIN UNIV
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Problems solved by technology

Some algorithms propose fuzzy algorithms, but because the algorithm itself is based on the ESPRIT algorithm, it has a large computational complexity
Another problem worth noting is that when a non-uniform array with an e

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  • Extension aperture two-dimensional combined diagonalization DOA estimation method
  • Extension aperture two-dimensional combined diagonalization DOA estimation method
  • Extension aperture two-dimensional combined diagonalization DOA estimation method

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Embodiment Construction

[0074] Aiming at the problems existing in the existing DOA estimation algorithm, the present invention proposes an extended two-dimensional DOA estimation algorithm based on a non-uniform L-shaped array. The antenna array is a non-uniform L-shaped array, in which there are Two uniform linear arrays with the number of array elements M are denoted by X, Y, Z, and W respectively. The distance between the array elements in each sub-array is half of the wavelength of the incoming signal; the distance between the two sub-array elements on each coordinate axis is d s (d s =hλ / 2, h is a positive integer).

[0075] The technical solution adopted by the present invention: the extended aperture two-dimensional joint diagonal DOA estimation algorithm comprises the following steps:

[0076] (1) Construct the time-delay cross-correlation matrix.

[0077] (2) Construct the selection matrix to obtain four diagonal matrices respectively.

[0078] (3) The direction cosine estimation value w...

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Abstract

The present invention relates to the technical field of radars. In order to solve the problem of angle estimation invalidation in a real mobile communication pitch angle range with a pitch angle of 70-90 degrees, the problem of pairing of the pitch angle and an azimuth angle and the problem of a singular point in the traditional two-dimensional DOA estimation, the extension aperture two-dimensional combined diagonalization DOA estimation method is implemented by employing a heterogeneous array, and comprises the steps of: (1) constructing a delay cross correlation matrix; (2) constructing a selection matrix to obtain four diagonal matrixes; (3) obtaining a z-axis direction cosine estimated value with low precision and without ambiguity and a z-axis high-precision direction cosine estimatedvalue with ambiguity; (4) obtaining two direction cosine estimated values on the x axis in a similar way; and (5) obtaining direction cosine estimated values with low precision and without ambiguitythrough adoption of an ambiguity-resolving method as shown in the description; and (6) obtaining estimated values of the pitch angle and the azimuth angle and a value as shown in the description. Theextension aperture two-dimensional combined diagonalization DOA estimation method is mainly applied to the DOA occasions for estimation of the received signals.

Description

technical field [0001] The invention relates to the technical field of estimating the direction of arrival of received signals by using an array antenna, in particular to a method for estimating the direction of arrival of a signal using a non-uniform L-shaped antenna array with an expanded aperture. Background technique [0002] Space signal direction of arrival (Direction of Arrival, DOA) estimation is a main research direction of space spectrum estimation, which is widely used in radar, sonar, earthquake, communication and many other fields. The basic problem of DOA estimation is to determine the direction angle at which each signal arrives at the reference element of the array, referred to as the direction of arrival. Classical subspace decomposition DOA estimation algorithms include multiple signal classification algorithm (MUSIC, Multiple Signal Classification) and signal parameter estimation algorithm based on rotation invariant technique (ESPRIT, Estimation of Signal...

Claims

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 杨晋生项杨
Owner TIANJIN UNIV
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