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Arrival direction estimation method based on conjugation expansion

A direction of arrival estimation and direction of arrival technology, which is applied in the directions of space transmit diversity, diversity/multi-antenna systems, etc., can solve the problems of insufficient effective aperture of the array, low estimation accuracy, and limited estimation ability.

Active Publication Date: 2012-09-26
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

Due to the limited array elements or virtual array elements of this method, its ability to estimate the direction of arrival of the signal is limited; moreover, the effective aperture of the array of this method is insufficient, which leads to the low accuracy of the method for estimating the signal direction

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  • Arrival direction estimation method based on conjugation expansion
  • Arrival direction estimation method based on conjugation expansion
  • Arrival direction estimation method based on conjugation expansion

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Embodiment Construction

[0056] Such as figure 1 and figure 2 As shown, the present invention discloses a method for estimating DOA based on conjugate extension. First, second-order statistical processing is performed on the received array signal, and the conjugate matrix of the steering matrix is ​​obtained by using the property of the delayed autocorrelation function. Then, the conjugate matrix of the steering matrix is ​​obtained by using The delayed sampling of the extended vector constructs a new pseudo-snapshot matrix, and finally uses the fourth-order cumulant method to estimate the direction of arrival of the signal on this matrix.

[0057]Assume that the antenna array is a uniform linear array, each array element is uniform and omnidirectional, the number of array elements is M, and the distance between array elements is d. If there are D far-field narrowband incoherent signals in the space, respectively from θ i (i=1,2,...D) are incident into the antenna array. Order (a m ,a m ) repres...

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Abstract

The invention discloses an arrival direction estimation method based on conjugation expansion. The method comprises the following steps of: firstly calculating and receiving a second order statistic between signals, obtaining a conjugation matrix of an oriented matrix by utilizing the property of a delay self-correlation function, then constructing a new pseudo snapshot matrix by utilizing delay sampling of an extensible vector, and finally estimating an arrival direction of a signal on the matrix by adopting a fourth-order cumulant method. By virtue of a signal arrival direction estimation method based on array extension, the number of estimated signal arrival directions is greatly increased and signal arrival direction estimation accuracy can be improved.

Description

technical field [0001] The invention relates to a signal direction-of-arrival (DOA) estimation technology, which utilizes a smart antenna to estimate the direction-of-arrival of a wireless received signal, thereby providing technical support for network positioning, node management, business services and position-related information services. Background technique [0002] Direction of Arrival (DOA) estimation in array signal processing has a wide range of applications in radar, wireless communication and other fields. Among them, the MUSIC algorithm based on subspace estimates the direction of arrival of the array signal, opening up a new era of array signal processing. The MUSIC algorithm is an array signal processing method based on second-order statistics. The method of second-order statistics usually assumes that the signal to be estimated is Gaussian distributed, but in practical applications, the signal generated by the source is usually non-Gaussian distributed. , so...

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Application Information

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IPC IPC(8): H04B7/08
Inventor 单志龙刘方伟史景伦
Owner SOUTH CHINA NORMAL UNIVERSITY
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