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Estimation method of angle of arrival angle of coprime array based on fourth-order cumulant

A direction of arrival and array technology, applied in the field of signal processing, can solve the problems of waste of reconnaissance and positioning resources, inability to estimate signals, and the number of signals cannot meet practical applications, and achieve the effect of improving array utilization and increasing the number of signal sources.

Active Publication Date: 2018-08-31
XIDIAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This method has the ability to estimate the number of signals that is more than the number of array elements, but the method still has the disadvantage that when the number of array elements is fixed, the number of signals that can be estimated sometimes still cannot meet the practical application
However, most of the existing angle-of-arrival estimation methods based on fourth-order cumulants are aimed at uniform arrays, and for coprime array algorithms, the maximum utilization of the array elements cannot be achieved due to the lack of reasonable setting of the array element positions.
In practical applications, given a certain number of array elements, if these array elements cannot be reasonably used to obtain enough virtual array elements, enough signals cannot be estimated, resulting in a waste of reconnaissance and positioning resources

Method used

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  • Estimation method of angle of arrival angle of coprime array based on fourth-order cumulant
  • Estimation method of angle of arrival angle of coprime array based on fourth-order cumulant
  • Estimation method of angle of arrival angle of coprime array based on fourth-order cumulant

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example 1

[0066] Simulation example 1. Constructing a double-layer coprime array structure.

[0067] First, use the first uniform linear array a and the second uniform linear array b to form a first-layer coprime array, set N=2, M=3, the first uniform linear array a contains 3 array elements, and the array element spacing is 2d , the second uniform linear array b contains 3 array elements, the array element spacing is 3d, and the first array element of the first uniform linear array a is placed at the 0d position;

[0068] Next, calculate the virtual array element number A=2MN+1=13 of the first-layer coprime array formed by the first uniform linear array a and the second uniform linear array b;

[0069] Then, use the third uniform linear array c and the fourth uniform linear array f to form a second-layer coprime array, set P=2, Q=3, the third uniform linear array c contains 2 array elements, and the array element spacing is PA =26d, the fourth uniform linear array f contains 3 array e...

example 2

[0072] Simulation example 2, calculates all virtual array elements of the double-layer coprime array according to the fourth-order cumulant.

[0073] Let the position of the first-layer coprime array formed by the first uniform linear array a and the second uniform linear array b be [0, 2, 3, 4, 6, 9]d;

[0074] Let the position of the second-layer coprime array formed by the third uniform linear array c and the fourth uniform linear array f be [26, 39, 52, 78, 117]d;

[0075] It is calculated that the virtual array formed by each array element of the first-layer coprime array and each array element of the second-layer coprime array is [26, 28, 29, 30, 32, 35]d, [39, 41, 42, 43, 45, 48]d, [52, 54, 55, 56, 58, 61]d, [78, 80, 81, 82, 84, 87]d, [117, 119, 120, 121, 123 , 126]d;

[0076] According to the method and principle of the fourth-order cumulant calculation, the virtual arrays are used to generate all the final virtual array elements, and the results are shown in Table 1...

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Abstract

The invention discloses a fourth-order cumulant based co-prime array DOA (Direction of Arrival) angle estimation method, which mainly solves problems in the prior art that the utilization rate of array elements is low and that the signal identification number is small. The estimation method comprises the implementation steps of 1) respectively building a one-layer co-prime array and a two-layer co-prime array; 2) acquiring an output signal of the one-layer co-prime array and an output signal of the two-layer co-prime array; 3) calculating all fourth-order cumulants according to the output signal of the one-layer co-prime array and the output signal of the two-layer co-prime array; 4) constructing a fourth-order cumulant array according to all of the fourth-order cumulants; 5) calculating a noise sub-space of the fourth-order cumulant array; 6) calculating a spatial spectrum according to the noise sub-space of the fourth-order cumulants and an array manifold matrix; and 7) drawing an amplitude spectrum according to the spatial spectrum, and acquiring a DOA angle. The estimation method disclosed by the invention greatly improves the recognizable source number of an array under the condition that the number of array elements is limited, and is applicable to target reconnaissance and passive location.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a method for estimating the direction of arrival of an array signal of an electromagnetic signal, which can be used for reconnaissance and passive positioning of moving targets of aircraft and ships. Background technique [0002] DOA estimation of signal direction of arrival is an important branch in the field of array signal processing. It refers to the use of antenna arrays to inductively receive spatial acoustic signals and electromagnetic signals, and then use modern signal processing methods to quickly and accurately estimate the direction of the signal source. It has important application value in radar, sonar, wireless communication and other fields. With the continuous advancement of science and technology, there are higher and higher requirements for the degree of freedom achieved by the array when estimating the direction of arrival of the signal. [0003] In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14G01S3/06
CPCG01S3/06G01S3/143
Inventor 蔡晶晶宗汝苏瑶刘高高李鹏
Owner XIDIAN UNIV
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