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Motion platform expansion space fractal array design method for direction of arrival estimation

A technology of direction of arrival estimation and motion platform, applied in design optimization/simulation, radio wave measurement system, instrument and other directions, can solve the problems of difficulty in applying motion platform, large synthetic distance requirements, and increased signal coherence requirements, etc. Achieve superior estimation performance, convenient design, and reduce coupling effects

Pending Publication Date: 2022-08-05
XIDIAN UNIV
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Problems solved by technology

For larger apertures, the composite distance is required to be greater, and the requirements for signal coherence are further increased, making it difficult to apply to the motion platform requirements

Method used

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  • Motion platform expansion space fractal array design method for direction of arrival estimation
  • Motion platform expansion space fractal array design method for direction of arrival estimation
  • Motion platform expansion space fractal array design method for direction of arrival estimation

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Embodiment Construction

[0030] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0031] refer to figure 1 , the implementation steps of this embodiment are as follows:

[0032] Step 1, build the generator array.

[0033] 1.1) Determine the second-order nested array parameter N 1 and N 2 , to build a second-order nested array:

[0034] Nested arrays are composed of multiple sub-arrays with different spacings between array elements, which are usually divided into second-order nested arrays and multi-order nested arrays. Multi-order nested arrays are all extended on the basis of second-order nested arrays. Forming.

[0035] This example is mainly based on second-order nested arrays, which are implemented as follows:

[0036] Let the first uniform sparse array have N 1 array elements, the distance between the array elements is d 1 , N 1 >1, d 1 =λ / 2, λ is the signal wavelength;

[0037] Let the second uniform sparse array ha...

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Abstract

The invention discloses a motion platform expansion space fractal array design method for direction-of-arrival estimation, and mainly solves the problem that expansion of array element spacing of a sparse array on a motion platform in the prior art is not beneficial to improvement of uniform degree of freedom. According to the implementation scheme, the number of array elements of two uniform sparse arrays is determined, and a second-order nested array is obtained; the array element spacing of the second-order nested array is enlarged by three times, and a generator array is constructed; fractal is carried out on the generator array for multiple times, and an expanded space fractal array is obtained; carrying the expanded fractal array obtained after fractal on a motion platform to move for half wavelength, and synthesizing the expanded fractal array with the expanded space fractal array before motion to obtain a motion synthesis array; and carrying out direction of arrival estimation on the radar radiation source signal through a traditional spatial spectrum estimation algorithm by using the motion synthesis array. The method has the advantages of high degree of freedom, few recursion times and large array aperture, can be used for sparse array DOA estimation, and improves the DOA estimation performance.

Description

technical field [0001] The invention belongs to the technical field of direction of arrival estimation, and further relates to a space fractal array design method for expanding array element spacing, which can be used for sparse array DOA estimation to realize the estimation of the direction of arrival of multi-channel signals. Background technique [0002] The sparse array has the ability to measure the direction of arrival of more sources than the number of physical sensors, and the advantage is that it can be estimated with N sensors O(N 2 ) are uncorrelated sources, so they have played an important role in radar, radio, and communications in recent years. This feature depends on its differential array, which is defined as the difference between two physical sensors. To increase the degree of freedom of the array, the differential array should be as large as possible. As a result, different sparse array design methods have been proposed, including minimal redundancy arr...

Claims

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Application Information

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IPC IPC(8): G01S7/35G01S7/28G01S7/40G06F30/20
CPCG01S7/35G01S7/28G01S7/4004G06F30/20
Inventor 秦国栋黄耀华刘婧婧鲍丹刘高高武斌李鹏
Owner XIDIAN UNIV
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