ID 原文 译文
17195 海水越浅、声源频率越小、声源深度越大，都会导致海水中的能量越少，越有利于Scholte波的激发，此时声源辐射的能量主要以Scholte波的形式传播出去，能量更多地集中在海底界面处。 The shallower the sea water, the lower the frequency and the greater the depth of the sound source, the less energy in the sea water will be. The energy radiated by the acoustic source is mainly propagated in the form of Scholtewave, and the energy is mostly concentrated at the seabed interface.
17196 水声定位系统是现代深海作业必备的高精度水下定位装备，精确的时延估计是实现高精度水声定位的基础，但由于信号远距离传输以及强干扰的影响，水声定位系统时延估计精度较低。 The underwater positioning system is the essential and necessary equipment for modern deep-sea operations. Accurate time delay estimation is the basis for achieving high-precision localization. However, the performance of time delay estimation will decrease due to the long-distance transmission and strong clutter.
17197 针对此问题该文提出一种基于子空间理论的宽带强干扰抑制方法， To solve this problem, a novel interference suppression method based on the subspace theory is proposed.
17198 首先通过贝叶斯信息量准则估计子空间维度，然后推导了不同信号假设下的概率密度函数，求解未知参数的最大似然估计，构造广义似然比并通过最优匹配广义似然比检测法估计与期望信号最匹配的子空间， The dimension of the subspace is estimated using Bayesian information criterion at first, and the probability density function under different assumptions are then derived by estimating the unknown parameters to construct the generalized likelihood ratio. Finally, the most suitable subspace may be estimated using the optimal matchinggeneralized likelihood ratio detection method.
17199 然后以此构造空间投影算子对接收数据进行线性投影，最终抑制干扰和噪声，提高时延估计精度。 The projection operator is constructed to linearly project the received data, suppressing the interference and noise as a result of improving the accuracy of time delay estimation.
17200 仿真结果表明该方法能够有效抑制干扰和噪声的影响，提高定位系统时延估计精度。 The simulation results show that the proposed method can effectively suppress the influence of theclutter and improve the estimation accuracy of the time-delay.
17201 单载波频域均衡(SC-FDE)是水声通信中实现高数据率传输的重要技术之一，但传输序列中周期性插入的循环前缀或保护间隔等前后缀降低了频带利用率和通信速率。 Single-Carrier Frequency-Domain Equalization (SC-FDE) is one of the key techniques to achieve highdata-rate transmissions in underwater acoustic communications. However, the periodically inserted prefixes orsuffixes, in forms of cyclic-prefixes or guard intervals in transmission sequence, reduce the bandwidth efficiencyand data rate.
17202 该文在时间反转(TR)处理的基础上提出一种新型无前后缀的水声单载波频域均衡技术，即发射机传输无前后缀的单载波信号，接收机对各个数据块的后缀进行重构并利用频域均衡技术消除符号间干扰。 A SC-FDE technique without prefix or suffix is proposed based on the Time Reversal (TR) forunderwater acoustic communications. At the transmitter side, the single-carrier signal without prefix or suffix istransmitted. At the receiver side, the suffix is reconstructed in each block before canceling the intersymbolinterference with FDE.
17203 重构数据块后缀作为接收机的核心部分，主要包括3个步骤：TR处理、干扰消除和后缀重构。 The suffix reconstruction, which is the core of receiver, contains three main procedures:the TR processing, interference cancelation, and suffix reconstruction.
17204 首先，TR处理将来自接收阵元的多通道信号融合为单通道信号，并且其等效信道冲激响应(即q函数)的稳定主峰避免了后缀重构中的噪声放大。 First, the TR processing convertsreceptions from an array of receiving elements into a single composite signal. The equivalent impulse response(namely the q-function) has a stable peak, which avoids the noise amplification.