Near/far field broadband mixed source far field source direction finding method based on amplitude-phase error array

An amplitude and phase error, array technology, applied in the field of far-field source direction finding, can solve the problem of inaccurate direction of arrival estimation, and achieve the effects of saving calculation time, high estimation accuracy, and improving efficiency

Inactive Publication Date: 2017-03-29
HEILONGJIANG UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of inaccurate estimation of the direction of arrival of the far-near-field broadband signal source in the existing far-near-field broadband signal source when there is an array amplitude-phase error, and propose a medium-far field signal for the far-near-field broadband signal source when there is an array amplitude-phase error Direction of Arrival Estimation Method of Signal Source

Method used

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  • Near/far field broadband mixed source far field source direction finding method based on amplitude-phase error array
  • Near/far field broadband mixed source far field source direction finding method based on amplitude-phase error array
  • Near/far field broadband mixed source far field source direction finding method based on amplitude-phase error array

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the specific process of the far-near-field broadband hybrid source mid-far field source direction finding method based on the amplitude and phase error array of this embodiment is as follows:

[0017] Step 1. Build an ideal source model;

[0018] Step 2, constructing the source model under the array amplitude and phase error according to the source model under ideal conditions;

[0019] Step 3: Calculate the estimated value of the direction of arrival of the far-field signal source according to the signal source model under the array amplitude and phase error.

specific Embodiment approach 2

[0020] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the source model under ideal conditions is constructed in the step one; the specific process is:

[0021] Such as figure 1 shown, assuming N 1 far-field chirp broadband sources and N 2 near-field chirp broadband source At the same time, it arrives on a uniform linear array composed of 2M+1 omnidirectional array elements, and the arrival angle is θ. where N=N 1 +N 2 , N is the total number of information sources; N, N 1 , N 2 The value is a positive integer, and the value of M is a positive integer; the value of θ is -90°~+90°;

[0022] Assuming that the number of far and near field sources is known, the sources are not correlated with each other and the power reaching the array is equal, the 0th array element is used as the phase reference point, and the near field sources The distance from the phase reference point is The array elem...

specific Embodiment approach 3

[0051] Specific implementation mode three: this implementation mode is different from specific implementation mode one or two in that: in said step two, construct the signal source model under the array amplitude and phase error according to the signal source model under ideal conditions; the specific process is:

[0052] When there is an array amplitude and phase error, W(f i ) means the frequency point f i The array amplitude and phase error matrix on is expressed as:

[0053] W(f i ) = diag([W -M (f i ),…,W -m (f i ),…,1,…,W m (f i ),…,W M (f i )] T ) (12)

[0054] in

[0055]

[0056] In the formula, diag means to take the diagonal matrix of the vector, ρ m (f i ), Respectively, the source frequency is f i When , the amplitude gain and phase deviation of the mth array element relative to the 0th array element has nothing to do with the arrival direction of the signal source, so when there is an array amplitude and phase error, the nth signal source is a...

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Abstract

The invention provides a near/far field broadband mixed source far field source direction finding method based on an amplitude-phase error array, relates to a near/far field broadband mixed source far field source direction finding method, and is to solve the problem of inaccurate estimation of direction of arrival of a far field information source in a near/far field broadband mixed information source when array amplitude-phase errors exist at present. The near/far field broadband mixed source far field source direction finding method based on the amplitude-phase error array comprises the following specific steps: 1) constructing an information source model under an ideal condition; 2) constructing an information source model under the array amplitude-phase errors according to the information source model constructed under the ideal condition; and 3) calculating a far field information source direction-of-arrival estimation value according to the information source model constructed under the array amplitude-phase errors. The method is used in the signal processing field.

Description

technical field [0001] The invention relates to a method for measuring the direction of a far-near-field wide-band mixed source in a middle-far field. Background technique [0002] Super-resolution direction finding is an important research content in array signal processing, and has a wide range of applications in the fields of radio monitoring, Internet of Things and electronic countermeasures. Most of the current direction finding methods are based on the premise of accurately grasping the flow pattern of the array. However, in the actual direction finding system, the gain and length of each array channel are often inconsistent, resulting in the direction finding estimation is often accompanied by array amplitude and phase errors, which directly leads to the deterioration of the performance of many super-resolution direction finding methods, or even failure, so This issue must be studied in depth. [0003] The calibration methods of array amplitude and phase errors can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S3/02
CPCG01S3/023G01S3/14
Inventor 甄佳奇
Owner HEILONGJIANG UNIV
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