对距离模糊、多途干扰等问题亦作了分析。
Some problems about the distance ambiguity and multi-path interference are also analysed.
海洋水声信道是多途、时变和频散的信道。
Ocean underwater channel is a stochastic acoustic propagation channel with its multipaths, time variety, and frequency spread.
由于水声信道的多途效应造成水声通讯质量大大下降，误码率很高。
In underwater communications, multi-path effect leads to the reduction of communication quality and the high error code rate.
信道通带窄、多途干扰强、衰落严重是水声通信高速可靠传输信息的主要障碍。
Narrow channel band, severe multipath interferences and severe channel attenuation have demonstrated the great complexities and difficulties of high-speed UWA communications.
多途时延估计广泛的应用于目标定位，波达方向估计等领域，因此具有十分重要的意义。
Time delay estimation was widely used in many areas such as target localization, directions of arrival (DOA) estimation.
本文给出的逆波束形成（IBF）方法具有抗多途效应效果好、算法简单、易于工程实现等优点。
The inverse beamforming (IBF)algorithm is simple and easy to be used in the practical engineering.
由于拖船噪声是一种具有多途角扩展的宽带相干强干扰，拖船噪声抑制是拖线阵声呐系统中的关键技术之一。
Towing ship noise is a kind of wideband interference with strong multi-path and Angle dispersion for a towed line array sonar system.
实验表明，脉冲压缩可有效增加浅海低频声脉冲的传输距离，信道匹配可用于消除多途对脉冲信号检测信噪比的影响。
Experimental results show that low frequency pulse compression and channel match method can be used in shallow water sound channel to improve the SNR.
该系统采用主动工作方式，本文系统地研究了在多途信道中对声学信号进行处理的理论研究和仿真分析及工程软件设计。
The theoretical and simulation analysis about acoustic signal processing in multi-path channel and the engineering software design are given in the dissertation.
该系统采用主动工作方式，本文系统地研究了在多途信道中对声学信号进行处理的理论研究和仿真分析及工程软件设计。
The system works in active mode. The theoretical and simulation analysis about acoustic signal processing in multi-path channel and the engineering software design are given in the dissertation.
论文完整地设计并实现了一套能适用于浅海的抗多途水声跳频数据传输系统，并经过了水池和厦门港的海上现场实验验证。
The dissertation designs and implements the system of data transmission with FH communication in underwater seas, which is performed in field test in Xiamen Harbor.
利用矢量水听器接收确知脉冲信号来确定声源方位时，脉冲信号形式可以考虑采用M序列调相信号，具有良好的抗多途效应。
M sequence signal can be chosen as the receiving deterministic pulse signal when using acoustic vector to determine the direction of the sound source. It possesses favorable anti-multipath capability.
众所周知，水下声信道是相干多途信道，信号在信道中的多径传播使得接收信号序列复杂化，因而极大地增加了信号处理的难度。
It's well known that underwater acoustic channel is a coherent multi-path channel, which brings difficulties in signal processing because of the complexity of the received signal sequence.
海上实验结果表明：在传输距离为12公里时，系统的误码率为10 - 2至10 - 3，具有较强的抗多途和起伏干扰能力。
The field experimental results show: the system provides the performances of anti-interference of multipath and fluctuation, with the bit error rates on the order of 10-2 to 10-3 at distance 12km.
与之相反，欧洲的汽车制造者们，比如梅赛德斯·奔驰公司和大众公司，要积极主动的多。大众汽车已向美国市场推出了若干使用柴油发动机的型号，例如帕萨特和途锐。
In contrast, European carmakers such as Mercedes-Benz and Volkswagen are growing more aggressive: VW offers American buyers diesel engines in several models, such as its Passat saloon and Touareg SUV.
与之相反，欧洲的汽车制造者们，比如梅赛德斯·奔驰公司和大众公司，要积极主动的多。大众汽车已向美国市场推出了若干使用柴油发动机的型号，例如帕萨特和途锐。
In contrast, European carmakers such as Mercedes-Benz and Volkswagen are growing more aggressive: VW offers American buyers diesel engines in several models, such as its Passat saloon and Touareg SUV.
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