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Unilateral sparse nested array design method for one-dimensional array direction finding

A design method and technology of nested arrays, which are applied in directions such as direction finder, direction finder using electromagnetic waves, direction finder using radio waves, etc., to increase the number of detections, increase spatial resolution, and reduce operating costs Effect

Active Publication Date: 2020-01-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these nested structures have significantly improved the degree of freedom of the array, compared with the minimum redundant array, there is still a lot of room for improvement in the degree of freedom

Method used

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  • Unilateral sparse nested array design method for one-dimensional array direction finding
  • Unilateral sparse nested array design method for one-dimensional array direction finding
  • Unilateral sparse nested array design method for one-dimensional array direction finding

Examples

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example 1

[0048] Simulation example 1: Set the total number of array elements N=13 unchanged, basic nested array (Nested Array, NA), augmented nested array (Augmented Nested Array, ANAI2), improved nested array (Improved Nested Array, INA) , maximum inter-element spacing constraint nested array (Maximum Inter-element Spacing Constraint, MISC) and unilateral sparse nested array (One-side Sparse Nested Array, OS-SNA) of the present invention middle large interval uniform line array element spacing Take it as N 1 +1=12, the number of array elements is taken as N 2 =1. This example uses the theoretical optimal array MRA as a reference. According to the analytical expressions of the above nested arrays, their normalized array element positions (omitting the spacing unit d) can be obtained as

[0049]

[0050] Assume that there are 23 uncorrelated information sources incident on the above sparse array in space, and the incident angles are evenly distributed between -30° and 30°. The si...

example 2

[0051] Simulation example 2: Set the total number of array elements to 14, N 1 =11,N 2 =2. The normalized array element positions of the six sparse structures are

[0052]

[0053] Assume that 11 uncorrelated signals are incident on the above six sparse structures, and the incident angles are uniformly distributed between -60° and 60°. Implement 200 Monte Carlo experiments, and estimate the root-mean-square error (Root-mean-square Error, RMSE) with the incident signal signal-to-noise ratio (Signal to noise ratio, SNR) when the number of signal snapshots is 2000 The curves are plotted in Fig. 4(a). The curve of RMSE changing with the number of snapshots is plotted in Fig. 4(b), and the signal-to-noise ratio is set to 10dB at this time. It can be seen from the figure that the OS-SNA proposed by the present invention has the closest estimation error to MRA, and is lower than the RMSE results of the other four structures. This is because for the above six sparse structures...

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Abstract

The invention discloses a unilateral sparse nested array design method for one-dimensional array direction finding. By performing sparse arrangement design on the left and right sub-arrays of a three-segment nested array and using a covariance recovery algorithm, a differential virtual array with a long continuous segment can be equivalently obtained. The implementation steps are as follows: calculating an array element spacing basic unit, determining array element spacing, the number of array elements and array element interval parameters of an middle uniform line array sub-array, determiningrelative positions of the array elements, and converting the relative positions into absolute positions of the array elements. By adopting the unilateral sparse nested array design method disclosed by the invention, the degree of freedom of the differential virtual array can be effectively increased under the condition of the same number of array elements, the estimation accuracy of the directionof arrival is improved, the detection capability of a space target is improved, and the array operating cost is reduced.

Description

technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a sparse array design method, in particular to a nested array-based free degree expansion structure, which can be used for phased array radar detection and orientation estimation of space multi-targets. Background technique [0002] Array signal processing technology has important application value in radar, communication, navigation and many other fields. As an important branch in the field of array signal processing, DOA estimation provides an important technical means for space target detection and azimuth estimation. Traditional direction of arrival estimation uses traditional phased array sensors. The characteristic of this type of phased array is that the array element spacing is less than or equal to half a wavelength, and the array elements are evenly arranged. This uniform arrangement ensures that the signal has a unique spatial spectrum form, no alia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S3/782G01S3/802
CPCG01S3/143G01S3/782G01S3/802
Inventor 任仕伟高巍董文涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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