CAJ | 학술논문

基于Pattern时延编码体制，针对水下超短基线定位系统设计了呼叫信号的正、负调频时延编码结构，并提出利用二次互相关技术进行时延估计。该方法在一定程度上能够提高呼叫方的可检测信噪比，同时在复杂环境下对信道中包括直达波在内的多径信号能量进行累加，能够准确地完成峰值检测，进而达到提高时延估计精度的目的。海试实验结果表明二次相关法在不同信噪比条件下能有效地抑制界面反射产生的多径干扰。
기우Pattern시연편마체제，침대수하초단기선정위계통설계료호규신호적정、부조빈시연편마결구，병제출이용이차호상관기술진행시연고계。해방법재일정정도상능구제고호규방적가검측신조비，동시재복잡배경하대신도중포괄직체파재내적다경신호능량진행루가，능구준학지완성봉치검측，진이체도제고시연고계정도적목적。해시실험결과표명이차상관법재불동신조비조건하능유효지억제계면반사산생적다경간우。
Based on pattern time delay shift coding regime, the structure of positive and negative frequency modulation calling pulses of underwater ultra-short base line acoustic positioning system is given, and a second correlation method of time delay estimation is proposed in this paper. As the second correlation method improves the detectable sig-nal-to-noise ratio of calling end to certain extent, it could accumulate the energies of multipath reflections including the direct wave effectively in the complex underwater channel environment, so as to achieve the peak detection accurately and to improve the accuracy of time delay estimation. The sea trial results show that the second correlation method could suppress the multipath interference from interface reflections under different signal-to-noise ratios efficiently.