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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第3期    总第259期    2016年3月

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文章编号:1672-7207(2016)03-0800-07
无源时间反转聚焦方法
刘伟1,付永庆1,许达2

(1. 哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨,150001;
2. 哈尔滨工程大学水声工程学院,黑龙江哈尔滨,150001
)

摘 要: 为了提高时间反转聚焦方法在电子战中的适用性,提出一种基于电磁波波动方程的无源时间反转聚焦方法。该方法以平面电磁波波动方程的时间反转不变性为基础,利用时间反转阵列接收并记录一段时间的信源发射信号,然后对该信号进行时间反转处理,利用计算已知目标域内各观测点处的虚拟接收和信号及其能量代替时间反转后信号的物理传输过程,实现时间反转后信号在信源处的重聚焦,其中能量最大点所对应的观测点即为信源点。在理论上验证该方法的正确性,然后以均匀圆形时间反转阵列为例进行仿真实验。研究结果表明:该无源时间反转聚焦算法具有有效性和准确性,在低信噪比下具有良好聚焦性能。

 

关键词: 无源时间反转;波动方程;聚焦;观测点

Passive time reversal focusing method
LIU Wei1, FU Yongqing1, XU Da2

1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China;
2. College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China

Abstract:In order to improve the applicability for time reversal focusing method in electronic warfare, a passive time reversal focusing method based on wave equation of electromagnetic wave was proposed. Based on the time reversal invariance of wave equation in electromagnetic plane wave, a part of signals emitted from source were received and recorded by the time reversal array, and then the recorded signals were time reversed. After that, by calculating the virtually received sum signals and energy values of every observed point in the given targets area instead of the physical transmission process of time-reversed signals, are refocused at source and the observed point whose energy value of virtual received sum signals is maximal is the source point. The correctness of the proposed method was verified theoretically, and then, the simulations with the time reversal array which is a uniform circular array were performed. The results show that the passive time reversal focusing method has effectiveness and accuracy, and the proposed method has good focusing performance at low SNR.

 

Key words: passive time reversal; wave equation; focusing; observed points

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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