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Propagation operator-based direction-of-arrival estimation method suitable for co-prime linear array

A technology of direction-of-arrival estimation and propagation operators, which is applied in radio wave direction/deviation determination systems, direction finders using radio waves, complex mathematical operations, etc., can solve problems such as low precision and high computational complexity, and achieve complex The effect of low degree, strong practical applicability, and excellent estimation performance

Inactive Publication Date: 2020-04-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Coprime array is a main form of sparse array. Compared with uniform linear array with the same number of array elements, sparse array has larger array aperture and higher degrees of freedom, so it has better spectrum estimation accuracy and resolution. There are advantages, but there are still two problems of low precision and high computational complexity in the various direction finding ambiguity elimination methods currently applied to coprime arrays

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  • Propagation operator-based direction-of-arrival estimation method suitable for co-prime linear array
  • Propagation operator-based direction-of-arrival estimation method suitable for co-prime linear array
  • Propagation operator-based direction-of-arrival estimation method suitable for co-prime linear array

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[0059] In order to better understand the technical content of the present invention, specific embodiments are given and described below in conjunction with the accompanying drawings.

[0060] In the invention, the meanings of various symbols are as follows:

[0061] (.) H Indicates the conjugate transpose of a matrix, the uppercase X represents a matrix, and the lowercase x( ) represents a vector.

[0062] The conventional coprime array structure involved in the present invention is such as figure 2 As shown, it is a coprime linear array composed of M+N-1 array elements. The coprime linear array is composed of two uniform linear arrays with only one array element coincident at the origin, denoted as sub-array 1 and sub-array 2. The number of array elements in sub-array 1 and sub-array 2 are M and N, respectively, and the array element spacings are d1=Nλ / 2, d2=Mλ / 2, where M and N are mutually prime numbers, and λ is the carrier wavelength. Since the two subarrays of the co...

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Abstract

The invention discloses a propagation operator-based direction-of-arrival estimation method suitable for a co-prime linear array, and the method comprises the following steps of: establishing a conventional co-prime array model, obtaining an angle estimation value with fuzziness according to a propagation operator algorithm, and finally eliminating angle fuzziness according to co-prime characteristics of sub-arrays. According to the method, the characteristics of the co-prime array and the propagation operator algorithm can be fully combined, the performance advantages of the co-prime array are exerted, the array parameter estimation performance is obviously improved, and compared with the propagation operator algorithm under the traditional linear array, the complexity is reduced, so thatthe practical applicability is stronger.

Description

technical field [0001] The invention relates to the technical field of array signal processing, in particular to a method for estimating a direction of arrival based on a propagation operator suitable for a coprime linear array. Background technique [0002] As one of the important branches of modern signal processing, array signal processing has a wide range of applications in many fields such as wireless communication and radar. The interference noise and uninteresting information are suppressed by a series of processing on the received signal of the array, and the useful characteristic information of the signal is extracted at the same time. [0003] However, in the traditional DOA estimation algorithm, the spacing between adjacent elements in the array must be no greater than half the wavelength of the incident signal to avoid angular blurring. However, at this time, there are problems such as serious mutual coupling of adjacent array elements, small array aperture, poo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G06F17/16
CPCG01S3/14G06F17/16
Inventor 吴畅赵高峰张小飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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