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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: 2020-10-30
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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  • Sampling method of plane wave generator
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  • Sampling method of plane wave generator

Examples

Experimental program
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Effect test

Embodiment 1

[0074] Example 1: When for x 1 = 1.0 and x 2 =1.11, the PWG uses deterministic non-redundant sampling, then samples K A = 1159 locations of PWG radiation sources. When sampling based on the proposed scheme, it is possible to assume initially candidate PWG emitter sampling locations with λ / 2 spacing, which will be at D p 5013 candidate positions are generated in the PWG region of =20λ, and then the OMP algorithm is used to select 1159 PWG radiation sources as atoms from the 5013 candidate positions, so as to obtain the same number of PWG radiation sources as in non-redundant sampling. The amplitudes of the synthesized fields on the AUT using two methods are shown in Figure 4 and Figure 5 respectively. Under the non-redundant sampling method, a 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 in Fig. 5(a). In both Fig. 4(a) and Fig. 5(a), the target plane area with a r...

Embodiment 2、 Embodiment 3

[0075] Embodiment 2, embodiment 3: through configuration parameter (x 1 ,x 2 =(1.0,1.0) (embodiment 2) and (x 1 ,x 2 =(0.9,0.9) (Example 3) shows the positions of radiation sources 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 respectively sample 1043 or 613 PWG radiation source positions. In OMP-based methods, 1043 or 613 PWG emitter locations will be selected as output. Figure 6(b) shows that when the PWG sampling is insufficient, that is, in embodiment 3, the quality of the synthetic field under the deterministic non-redundant sampling method is obviously reduced; under the same embodiment, as shown in Figure 7(b), in 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 0.0338 0...

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Abstract

The invention discloses a sampling method of a plane wave generator. The method comprises the following steps that: step 1, input parameters of a PWG sampling model in a plane wave synthesis process are determined, the determination process involves determining a PWG synthesis target, the number of target atoms and a candidate atom dictionary; step 2, related parameters used during the establishment of the PWG plane sampling model are initialized; step 3, the whole atom dictionary is traversed, and atoms used for synthesizing plane waves on a final PWG plane are cyclically searched; step 4, the weights of the atoms on the selected PWG are determined; and step 5, output parameters of the PWG sampling model are determined, wherein the output parameters comprise the information of the atoms selected in the step 3 and the step 4 and the weight corresponding to each atom. The method can calculate the weights of the sampling atoms at the same time, has the advantages of better performance ofthe synthesized plane waves and more sparse PWG sampling points. According to the method, the description of the problem of plane wave synthesis in the field of near-field and far-field conversion isinnovated.

Description

technical field [0001] The invention belongs to the technical field of a plane wave generator (PWG), near-far field transformation, and an 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 facing the problem of excessive data volume and long processing time. Traditional signal processing methods can no longer meet people's needs for massive data processing. Simple, efficient, and sparse signal representation methods are the focus of people's 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. Now more and more researchers use sparse representation in ima...

Claims

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Application Information

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Patent Type & Authority Applications(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