垂直线列阵结构对PTRM阵处理空间增益的影响

Influence of ULA Structure on PTRM Array Spatial Gain

水声信道多径的复杂性使得被动时间反转镜(PTRM)技术成为一大研究热点。该文推导了多阵元PTRM原理表达式,在此基础上给出了PTRM阵处理获得空间增益的机理,首次从理论上分析了垂直线列阵结构对PTRM阵处理空间增益的影响,并通过计算机仿真验证了理论分析,结果表明,PTRM阵处理空间增益随着阵元数目的增加而得到提高;当阵元间距足够大时(大于半个波长,使噪声不相关),阵元间距对PTRM阵处理的空间增益没有明显影响,此时影响到通信质量的主要是信噪比。

In order to overcome the complexity of acoustic channel′s multipath,theoretical expressions of the multi-element passive time reversal mirror(PTRM) are deduced,hence the principle of obtaining spatial gain by PTRM is proposed,and the influence of uniform linear array(ULA) structure on PTRM array spatial gain is studied theoretically for the first time.The proposed PTRM method is validated and analyzed with simulative data,and the computational results indicate that:(1) With the increase of array element number,PTRM array spatial gain is heightened;(2)When the element spacing is long enough(longer than the half of wavelength to let noise become incorrelate),element spacing has little effect on PTRM array spatial gain,where signal to noise ratio(SNR) influences the quality of communication predominantly.