Method for underdetermined DOA (direction of arrival) estimation based on partially calibrated and nested array under amplitude and phase error

A technology for direction of arrival estimation and amplitude and phase error, applied in radio wave direction/deviation determination systems, directional multi-channel systems using radio waves, direction finders using radio waves, etc., can solve problems such as failure

Active Publication Date: 2019-01-15
YANSHAN UNIV
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Problems solved by technology

[0007] The present invention overcomes the deficiencies in the prior art and provides an underdetermined DOA estimation method based on partially calibrated nested arrays under amplitude and phase errors, which is used to solve the problem of amplitude and phase errors in the existing DOA estimation methods And the failure problem when the number of sources is greater than the number of array elements (that is, underdetermined)

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  • Method for underdetermined DOA (direction of arrival) estimation based on partially calibrated and nested array under amplitude and phase error
  • Method for underdetermined DOA (direction of arrival) estimation based on partially calibrated and nested array under amplitude and phase error
  • Method for underdetermined DOA (direction of arrival) estimation based on partially calibrated and nested array under amplitude and phase error

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Embodiment Construction

[0101] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0102] refer to figure 1 and figure 2 , the implementation steps of the present invention are as follows:

[0103] Step 1: Reasonably select the array output data to construct the fourth-order cumulant vector;

[0104] Suppose K sources with non-zero fourth-order peaks are incident on a nested array composed of 2L array elements, such as figure 1 shown. The array element position is {0d,1d,...,Ld,2Ld,...,L 2 d}, where the array element whose label position is {0d,1d,...,Ld} corresponds to sub-array 1, and the label position is {0d,Ld,...,L 2 The array element of d} corresponds to sub-array 2, and the array element whose label position is {0d, 1d, Ld} has been calibrated, d=λ / 2, and λ is the carrier wavelength. Let x(t) be the received data in the time domain of the array, then the fourth-order cumulant of the observed data of the m, n, p, q∈{1,…,2L} array elem...

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Abstract

The invention discloses a method for an underdetermined DOA estimation based on a partially calibrated and nested array under an amplitude and phase error. The method comprises the following steps of:S1, selecting the array output data to construct a fourth-order cumulant vector; S2, combining a threshold decision and a multiplier function, to complete the estimation of the amplitude and phase error of the array, which is under the timely work of the reference information source; S3, correcting the fourth-order cumulative vector by utilizing the estimation result of the amplitude and phase error, and obtaining a Toeplitz non-singular matrix based on the strategy of a sub-array division; S4, accomplishing the DOA estimation by the ESPRIT algorithm. According to the method for the underdetermined DOA estimation based on the partially calibrated and nested array under the amplitude and phase error, which effectively estimates 2L<2> sources by using 2L array elements, and has good robustness on the amplitude and phase error of the array, the Gaussian white noise / color noise, and unknown non-uniform noise. Meanwhile, the method avoids an angle raster search with a large amount of computation.

Description

technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to an underdetermined DOA estimation method based on partially calibrated nested arrays under amplitude and phase errors. Background technique [0002] Direction of arrival estimation is an important research direction of array signal processing and plays a wide role in military and civilian fields. As we all know, for a uniform linear array with L array elements, classic DOA estimation methods such as MUSIC and ESPRIT can only effectively estimate L-1 sources at most. However, in the actual source location, there are often situations where the number of sources is greater than the number of array elements, that is, underdetermined. Therefore, how to estimate more number of sources with fewer array elements has become a research hotspot in the field of source location. And attracted extensive attention of domestic and foreign research scholars. An effective solut...

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Application Information

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IPC IPC(8): G01S3/74G01S3/14
CPCG01S3/14G01S3/74
Inventor 田野徐鹤王彦茹史佳欣
Owner YANSHAN UNIV
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