TRC路径特征及其对时间反演信噪比的影响

陆希成; 邱扬; 江凌; 汪海波; 田锦; 郭昕伟

doi:10.11884/HPLPB202133.210171

TRC路径特征及其对时间反演信噪比的影响

doi: 10.11884/HPLPB202133.210171

1.
西安电子科技大学机电工程学院，西安 710071
2.
西北核技术研究所，西安 710024
3.
西安新佳腾电子科技有限公司，西安 710000

详细信息

作者简介:
陆希成，luxcheng2012@163.com

中图分类号: O441.4 TN011
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-10
- 修回日期: 2021-09-16
- 网络出版日期: 2021-10-16
- 刊出日期: 2021-12-15

Time reversal cavity path and its influence on signal to noise ratio

1.
College of Mechanical and Electrical Engineering, Xidian University, Xi’an 710071, China
2.
Northwest Institute of Nuclear Technology, Xi’an 710024, China
3.
Xi'an Sigten Electronic Technology Co., Ltd., Xi’an 710000, China

摘要

摘要: 时间反演具有时空聚焦特征，在许多方面有着潜在的应用。其中，基于时间反演腔的系统是一种主要的反演系统，可用于脉冲压缩、波束成形、微扰探测等。时间反演腔通常是一个电大的微波混沌腔，内部电磁波的传播具有明显的多径特征，即时间色散特征。因此，在时间反演过程中，反演腔可对反演信号进行相位补偿，重构出初始信号，从而在初始位置形成脉冲的时间压缩和空间聚焦。为了拓展时间反演腔的实际应用，本文基于多径信道模型研究腔体参数对反演性能的影响，重点分析路径的衰减特征、串扰特征和叠加特征对反演信噪比的影响，并总结给出影响反演信噪比的主要参数以及基本规律。
- 时间反演腔 /
- 多径信道模型 /
- 多径效应 /
- 信噪比
Abstract: Time reversal has the characteristics of spatiotemporal focusing and has potential applications in many field. The reversal system based on time reversal cavity (TRC) is an important reversal system. It can be used for pulse compression, beam forming, perturbation detection and so on. The TRC is usually an electrically large microwave chaotic cavity, and the propagation of electromagnetic wave in it has obvious multipath characteristics. That is, time dispersion characteristics. Therefore, in the process of time reversal, the TRC can compensate the phase of the reversal signal and reconstruct the initial signal, which can give time compression and spatial focusing at the initial position. To enhance the application of TRC, this paper studies the influence of cavity parameters on the reversal signal to noise ratio (SNR) based on the multipath channel model, focusing on the analysis of the influence of path attenuation, crosstalk and superposition. Moreover, it summarizes the main parameters and basic laws affecting the SNR.
- time reversal cavity /
- multipath channel model /
- multipath effect /
- signal to noise ratio

HTML全文

图 1 典型时间反演腔和其时间反演结果

Figure 1. Typical time reversal cavity (TRC) system and its time reversal results

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图 2 典型的路径特征

Figure 2. Typical path properties

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图 3 初始信号、反演信号、重构信号的频谱分布特征

Figure 3. Spectrum distribution of initial，reversal and reconstructed signal

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图 4 腔体的归一化阻抗特征

Figure 4. The normalized impedance of cavity

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图 1 全光纤保偏超窄线宽光纤激光器结构示意图

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图 2 放大器的测试结果

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表 1 腔体损耗的路径统计特征与信噪比的关系

Table 1. Relationship between cavity loss and signal to noise ratio

No.	conductivity/（S·m⁻¹）	mean	standard deviation	mainlobe	SNR/dB
1	∞	0.0056	0.0085	0.45	18.3
2	3.56e+7	0.0044	0.0072	0.26	15.9
3	1e+6	0.0037	0.0065	0.23	15.6
4	1e+5	0.0017	0.0039	0.11	14.9

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表 2 不同结构腔体路径统计特征与信噪比的关系

Table 2. Relationship between cavity structure and signal to noise ratio

No.	structure	mean	standard deviation	mainlobe	SNR/dB
1		0.0049	0.0069	0.43	18.4
2		0.0034	0.0055	0.34	17.6
3		0.0016	0.0017	0.174	12.8
4		0.0012	0.0012	0.16	14.1

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表 3 腔体尺寸与信噪比的关系

Table 3. Relationship between cavity size and signal to noise ratio

No.	size/(mm×mm)	decay time	mean	standard deviation	SNR/dB
1	400×300	1.14	0.0069	0.0136	14.0
2	600×400	1.60	0.0056	0.0085	18.3
3	800×600	2.28	0.0044	0.0058	18.9

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