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2q-order nested array doa estimation method based on multi-frequency high-order cumulants

A technology of high-order cumulants and nested arrays, which is applied to radio wave measurement systems, direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve the problems that have not been applied to high-order cumulants, virtual Array elements cannot be used, matrix filling complex operations and other problems, to achieve the effect of increased degree of freedom, improved signal-to-noise ratio, and strong operability

Active Publication Date: 2022-05-27
AIR FORCE UNIV PLA
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Problems solved by technology

However, there are holes in the high-order virtual array formed by the nested array based on the high-order cumulant, which makes some virtual array elements unusable
For this problem, there are currently two solutions. One is to use only the continuous virtual array elements and discard the discrete virtual array elements, but it is obvious that some effective degrees of freedom are wasted; the second is to fill in the missing holes through matrix filling. In this way, the discrete array elements are connected, but the matrix filling requires complex operations
In recent years, a multi-frequency array DOA estimation method has been proposed, but it is only used in the DOA estimation method based on the second moment, and has not been applied to the field of high-order cumulants.

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[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] refer to figure 1 , an embodiment of the present invention provides a 2q-order nested matrix DOA estimation method based on a multi-frequency high-order cumulant, and the method includes the following steps:

[0024] Step 1, construct the high-order cumulant matrix and the high-order difference mutual matrix

[0025] For a linear array with N array elements, the received signal can be expressed as:

[0026]

[0027] where ...

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Abstract

The invention discloses a 2q-order nested array DOA estimation method based on a multi-frequency high-order cumulant, relates to the technical field of radar signal and information processing, and aims at the problem that virtual array elements cannot be fully utilized due to the occurrence of holes in the prior art , the present invention uses virtual array elements generated by multi-frequency signals to fill holes in the original high-order virtual array to form a continuous uniform linear array with higher degrees of freedom, thereby improving DOA estimation performance.

Description

technical field [0001] The invention relates to the technical field of radar signal and information processing, in particular to a 2q-order nested array DOA estimation method based on multi-frequency high-order cumulants. Background technique [0002] Direction of arrival (DOA) estimation aims to achieve high-precision target angle measurement. Compared with classical uniform arrays, sparse arrays have higher degrees of freedom and lower redundancy, so they are used in DOA estimation. received extensive attention and research. Typical sparse arrays include minimum redundancy matrix, minimum hole matrix, coprime matrix and nested matrix proposed in recent years, among which the matrix solution process of minimum redundancy matrix and minimum hole matrix is ​​complicated and has no closed solution, so it is difficult to be practical. . The coprime array and the nested array have closed array element position expressions, which can achieve higher degrees of freedom under the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14G01S7/02
CPCG01S3/14G01S7/02
Inventor 周豪胡国平师俊朋张秦冯子昂刘梦波
Owner AIR FORCE UNIV PLA
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