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DBF phased array system based on time modulation digital metasurface

A time-modulated, metasurface technology, applied in transmission systems, radio transmission systems, diversity/multi-antenna systems, etc., can solve the problem of insufficient degrees of freedom, and overcome the poor phase quantization accuracy, overall power consumption reduction, The effect of simplifying complexity

Active Publication Date: 2021-07-02
SHANGHAI AEROSPACE ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since there is only one receive channel behind the feed antenna, there is not enough degrees of freedom for adaptive beamforming to suppress interference and noise signals

Method used

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  • DBF phased array system based on time modulation digital metasurface
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  • DBF phased array system based on time modulation digital metasurface

Examples

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Embodiment 1

[0059] Embodiment 1: one bit time modulation digital metasurface transceiver antenna array

[0060] Please also see Figure 2 to Figure 3a , 3b.

[0061] In this embodiment, we build a one-bit digital metasurface antenna array with 8×8 array elements. The central operating frequency of the antenna is 7.5GHz, the array element spacing is λ / 2, and the overall size of the array is 160mm×160mm×2.339mm. Feed through the microstrip power division network, the detailed structure of the array can be found in figure 2 .

[0062] The one-bit digital metasurface antenna array includes alternately arranged 4 layers of metal structure layers and 3 layers of dielectric layers, from top to bottom: metal radiation patch layer 1 integrated with PIN diodes, upper dielectric substrate, bias Control network layer 3, semi-cured dielectric bonding sheet, metal floor layer, lower dielectric substrate, and power distribution feed network layer 4. Among them, the top metal radiation patch is comp...

Embodiment 2

[0064] Embodiment 2: Precise orientation perception based on time-modulated digital metasurface

[0065] First, the rationale is given as follows:

[0066] Consider an N-element linear time modulation array with element spacing D. Suppose the carrier frequency is F c The unit signal is incident on the array from the θ direction. Taking the first unit as a reference, the digital metasurface unit is periodically modulated, and after space feeding and combining, the received radio frequency signal passes through a low-noise amplifier, a mixer and a low-pass filter successively. After down-conversion, it is sampled by an analog-to-digital converter. In the digital domain, the fundamental wave and the first N-1 harmonic components are estimated by discrete Fourier transform or fast Fourier transform to obtain harmonic eigenvectors. Then, the Fourier series expansion is carried out on the modulation timing of each unit of the digital metasurface, and the harmonic characteristic ...

Embodiment 3

[0069] Example 3: Beamforming based on time-modulated digital metasurfaces

[0070] Please also see Figure 4 to Figure 8 .

[0071]In order to realize the digital metasurface adaptive beamforming based on time modulation, it is first necessary to restore the signals received by each unit on the digital metasurface under the constraints of time modulation. Since there is only one signal after spatial feed synthesis, in order to realize the separation of received signals on the digital metasurface, it is necessary to use the harmonic components generated after periodic time modulation. The idea is as follows: the signal received by the digital metasurface is time-modulated Finally, it enters the receiving antenna through space feeding, and after low-noise amplification and down-conversion, it is converted to digital domain for analog-to-digital conversion. In the digital domain, the sampled signal passes through a group of band-pass filter banks, and the 2*Q+1 fundamental wav...

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Abstract

The invention provides a DBF phased array system based on a time modulation digital metasurface. The DBF phased array system comprises a receiving and transmitting antenna composed of a digital metasurface array and a power division feed network, a single-path radio frequency module composed of a receiving and transmitting switch, a receiving channel and a transmitting channel, and a baseband signal processing and control board used for modulating the time sequence and coding of a metasurface unit. According to the basic principle, periodic time modulation is carried out on a digital metasurface array, harmonic characteristics of received signals are analyzed to calculate the incident direction of the signals, an autocorrelation matrix and arrival direction information of the signals are reconstructed and used for self-adaptive beam forming, interference null generation and the like, and the functions of shielding interference signals and the like are achieved. Compared with a traditional DBF antenna, the time modulation DBF metasurface only needs a single-path radio frequency module, the complexity of a radio frequency system is greatly simplified, and the overall cost and power consumption of the system are remarkably reduced.

Description

technical field [0001] The invention relates to a DBF phased array system based on time modulation digital metasurface. Background technique [0002] In recent years, in order to suppress the interference signal and noise received by the array antenna and extract the complete information in the received signal more effectively, the application of phased array system based on digital beamforming (DBF) was born. Different from traditional phased arrays, DBF phased arrays change the control of phase shifters and attenuators into direct weighting operations on digital signals, enabling the system to have super-resolution direction of arrival (DOA) estimation and adaptive beamforming capabilities. On the digital baseband, the efficient digital signal processing algorithm is used to process the received signal of the array, so that the main lobe of the beamforming is aligned with the direction of arrival of the desired signal, and the null trap is aligned with the direction of arr...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
CPCH04B7/0617H04B7/086Y02D30/70
Inventor 白旭东孙朦朦黄志凯贺冲吕艳亭钱婧怡孔凡伟熊勇华
Owner SHANGHAI AEROSPACE ELECTRONICS CO LTD
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