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A Sampling Method of Plane Wave Generator

A plane wave and generator technology, applied in the sampling field of plane wave generators to achieve better performance

Active Publication Date: 2021-05-28
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problem existing in the existing scheme is: In the traditional PWG design scheme, the non-redundant sampling theory is applied to the sampling of the PWG and AUT plane at the same time

Method used

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  • A Sampling Method of Plane Wave Generator
  • A Sampling Method of Plane Wave Generator
  • A Sampling Method of Plane Wave Generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1: When for x 1 = 1.0 and χ 2 = 1.11, the PWG uses deterministic non-redundant sampling, then samples K A = 1159 positions of PWG radiation sources. When sampling based on the proposed scheme, it is possible to assume candidate PWG radiation source sampling locations with λ / 2 spacing initially, which will be at D p 5013 candidate positions are generated in the PWG region of =20λ, and then 1159 PWG radiation sources serving as atoms are selected from the 5013 candidate positions by the OMP algorithm, so as to obtain the same number of PWG radiation sources as the non-redundant sampling. The magnitudes of the synthesized fields on the AUT using the two methods are shown in Figure 4 and Figure 5, respectively. Under the non-redundant sampling method, perfect symmetry with respect to the center of the radiation field can be observed in Fig. 4(a), while irregular fluctuations exist outside the AUT aperture of Fig. 5(a). A target plane area with a radius of 17λ ca...

Embodiment 2、 Embodiment 3

[0075] Example 2, Example 3: by configuring parameters (χ 1 ,χ 2 )=(1.0,1.0) (Example 2) and (χ 1 ,χ 2 ) = (0.9, 0.9) (Example 3) shows the radiation source positions selected by the PWG under the two non-oversampling examples. When deterministic non-redundant sampling is used to select the PWG radiation source, Embodiment 2 and Embodiment 3 will sample 1043 or 613 PWG radiation source positions, respectively. In the OMP-based approach, 1043 or 613 PWG radiation source locations would be selected as outputs. Figure 6(b) shows that when the PWG sampling is insufficient, that is, in Example 3, the quality of the synthesized field is significantly degraded under the deterministic non-redundant sampling method; under the same example, as shown in Figure 7(b), in the The quality of the synthetic field based on the method of the present invention meets the requirements.

[0076] Table 1

[0077] Example 1 Example 2 Example 3 traditional solution 0.0175 0...

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Abstract

The invention discloses a sampling method of a plane wave generator, comprising the following steps: Step 1, determining the input parameters of the PWG sampling model in the plane wave synthesis process, including determining the PWG synthesis target, the number of target atoms, and a candidate atom dictionary: Step 2, Initialize the relevant parameters used when establishing the PWG plane sampling model, step 3, traverse the entire atom dictionary, and loop to find the atoms used to synthesize plane waves on the final PWG plane, step 4, determine the weight of the atoms on the selected PWG; step 5 , to determine the output parameters of the PWG sampling model, including the information of the atoms selected in step 3 and step 4 and the weight corresponding to each atom. The method of the invention can simultaneously calculate the weight value of the sampled atoms, has the advantages of better synthetic plane wave performance and more sparse PWG sampling points, and is innovative in the problem description of plane wave synthesis in the field of near-far field conversion.

Description

technical field [0001] The invention belongs to the technical field of plane wave generator (PWG), near-far field transformation, and orthogonal matching pursuit algorithm (OMP), and in particular relates to a sampling method of a plane wave generator. Background technique [0002] At present, with the rapid development of chips, sensors, memory and other hardware devices, many fields are faced with the problem of excessive data volume and long processing time. Traditional signal processing methods have been unable to meet people's needs for processing large amounts of data. Simple, efficient, and sparse signal representation methods are the focus of research and attention. Sparse representation and dictionary learning methods have unique advantages in solving the problem of excessive data volume. Sparse representation and dictionary learning methods were first used in signal processing problems in compressed sensing, and now more and more researchers use sparse representati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/10G01R1/28G06F30/20G06F111/10
CPCG01R1/28G01R29/105G06F30/20G06F2111/10
Inventor 李勇高凌宇孙浩
Owner BEIJING UNIV OF POSTS & TELECOMM