稀疏阵列时间反演脉冲信号空间功率合成方法

时间反演电磁波具有时空二维同步聚焦特性.基于时间反演电磁波原理建立了稀疏阵列脉冲信号相干合成的数学模型, 通过理论分析与蒙特卡洛实验相结合的方法研究了合成信号幅度最大时刻目标点合成效率值的统计特征与相位误差及阵元数的关系.分析表明, 在工程实践中, 除尽可能提高相控精度外, 可以通过增加阵列的阵元数来减小目标点合成效率的方差, 以降低相控误差的影响.利用仿真计算研究了相位误差及信号形式对时间反演脉冲信号合成效果的影响, 证实了稀疏阵列时间反演脉冲信号空间功率合成的可行性; 分析方法和结果可以为工程实践中如何折衷需求与条件确定相位误差的控制精度提供理论依据.

Spatial power combining of time reversal pulse signal using sparse array

The most important characteristics of time reversal (TR) technique are temporal and spatial focusing properties. Based on these, a model of time reversal pulse signal power combining using sparse array is established. The relationship of the statistical characteristics of combining efficiency at the time of maximum amplitude with the phase error and the number of array elements is analyzed. And the influence of phase error and signal type on the combining efficiency is investigated by both theoretical analysis and the numerical simulation. The analysis shows that, in the engineering application, a large number of small power nodes could be used to reduce the effect of phase error. And when the array elements work in the same frequency, polarization and antenna type, the parameter of phase error would affect the combing result. Even though the phase error occurs, the spatial power combining can still be realized with the time reversal technique. The methods and results presented in this paper are useful for the determination of the compromise between the requirements and the possibility.