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Bilateral sparse nested array design method for direction of arrival estimation

A technology of direction of arrival estimation and design method, which is applied to direction finders using radio waves, radio wave direction/bias determination systems, etc., to achieve the effect of large degrees of freedom and sparse array elements

Active Publication Date: 2020-05-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
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  • Application Information

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Problems solved by technology

However, compared with the minimum redundant array, the current sparse array structure based on the nested array still has a lot of room for improvement in its degree of freedom, and there is a sparse law in the arrangement of its array elements.

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  • Bilateral sparse nested array design method for direction of arrival estimation
  • Bilateral sparse nested array design method for direction of arrival estimation
  • Bilateral sparse nested array design method for direction of arrival estimation

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Embodiment Construction

[0024] The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Take the incident signal frequency 20GHz, the total number of array elements N=17 as an example, for the bilateral sparse nested array of the present invention (such as figure 1 shown) build is described in detail.

[0026] Step 1, determine the distance basic unit length:

[0027] Calculate the incident signal wavelength λ=c / f=3.0×10 8 / 20×10 9 =1.5cm; use d to represent the basic unit of array element spacing, and take it as half wavelength, that is, d=λ / 2=7.5mm;

[0028] Step 2, determine the array parameters:

[0029] According to the total number of array elements given by the array N=17 and N=N 1 +N 2 +1, choose a set of N 1 and N 2 , satisfying N 1 ≥10,N 2 ≥1; this embodiment selects N 1 =14,N 2 =2, the structure is as figure 2 shown;

[0030] Step 3, according to N 1 Calculate the array element spacing param...

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Abstract

The invention discloses a bilateral sparse nested array design method for direction of arrival estimation. The method is based on an existing nested structure and implements the sparse layout of the bilateral subarrays to ensure the nonporous performance of the differential virtual array and then obtain the improvement of the degree of freedom. Tthe implementation steps are as follows: calculatingthe array element spacing basic units, determining the array element spacing, the array element number and the array element spacing parameters of the middle uniform linear array subarrays, and determining the physical positions of the array elements according to an analytic expression. OThe degree of freedom of the differential virtual array is effectively increased without changing the number of array elements, and high-precision target detection and azimuth estimation are achieved.

Description

technical field [0001] The present invention relates to sparse optimal array arrangement, specifically, relates to a sparse array optimal layout and design method suitable for radar phased array direction of arrival estimation, which can be used for passive sparse array target detection and azimuth estimation, while ensuring the use of the same number In the case of array elements, the virtual aperture is improved by optimizing the layout of the array elements, thereby improving the accuracy of target azimuth estimation. Background technique [0002] Sparse array is an array layout method that uses a smaller number of sensors to obtain the same or greater degrees of freedom as traditional phased arrays, and thus has stronger space detection capabilities and target orientation estimation accuracy. The sparse array calculates the covariance of the received signals of each array element, and then vectorizes the covariance matrix to obtain an equivalent virtual phased array. Th...

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 任仕伟董文涛王卫江
Owner BEIJING INSTITUTE OF TECHNOLOGYGY