在水下信号处理中，参数估计和目标识别是两类非常重要的问题。
During underwater signal processing, parameter estimation and target identification are two kinds of important problems.
这些声音在水下行进，直到遇到水下物体，然后返回到发出信号的海豚，显示出目标的位置，大小和形状。
These sounds travel underwater until they encounter objects, then bounce back to their dolphin senders, revealing the location, size, and shape of their target.
但在Grex的系统内，水下机器人将充当一个中继站，将来自母船的控制信号传给连网的其他机器人，这种方式下的传输距离可达到数英里。
But in the Grex system, vehicles will be able to act as relay stations, bouncing a control signal from the mother ship to the networked submarines over many miles.
这是由于水下目标辐射信号和海洋环境的复杂性、多变性造成的。
This is caused by the complexity of underwater target radiated noise and the variety condition of the sea.
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.
声呐浮标测试系统能够模拟水下声信号，用以检测声呐浮标的工作状态和性能。
The sonar buoy testing system can emulate signal of underwater sound and detect the operating status and performance of sonar buoy.
水下声信号激光探测技术采用了激光接收技术。
The laser detection of underwater acoustic signals exploited a laser receiving technique.
该光发射模块可与计算机进行通信，接收岸基站传送的控制信号去监测和控制水下光电模块。
The optical transmitter module communicates with the computer and receives the control signal from the workstation in the shore to control and monitor undersea photoelectricity module.
由于水下通信信道对光信号的衰减极大，实际通信系统的编码应具有极强纠随机差错和纠突发差错的能力。
Because of the enormous fading of the optical signal in underwater laser communication, the capacity of the error-correcting code must be well enough.
水下武器系统综合检测系统采用模块化设计思想，由信号发生器模块、A/D模块、D/A模块、实时时钟模块、液晶及打印机模块等组成。
The synthesized test system for underwater weapon system adopts a modularized structure with signal generator, A/D converter, D/A converter, real-time clock, printer and LCD screen.
这一结果对于进一步开展水下目标信号的识别、分类研究具有重要参考价值。
The research results will be helpful in the further study of underwater acoustic signals.
水下声信号在水-空气界面会引起表面波动而对打在水表面的激光进行调制。
The underwater acoustic signal can cause surface wave motion at the water-air interface and hence modulate the magnitude of the laser beam falling on the water surface.
舰船辐射噪声信号的特征提取技术因其在水下装备中具有重要的应用价值，一直是国内外研究的热点和难点。
The technique of feature extraction of ship-radiated noise is of importance to underwater equipment, and it is a hotspot and difficult area in the national and international research.
水下弱信号的检测和分类是水声信号处理领域中的难题。
Detection and classification of weak underwater signals are difficult problems in processing acoustic signals.
本文提出了一种利用大动态范围脉冲幅度自动增益控制技术和数字波形存储技术，实现水下目标信号存储和目标回波波形模拟的方法。
A method for acoustic signal storage and simulation of underwater target is presented in this paper. The techniques of large dynamic pulse gain control and digital waveform storage are applied.
为了实现水下载体高精度的定位，GPS声纳浮标需解决两个方面的技术难点：高精度的系统时钟同步和定位信号的高精度时延估计。
As for the high precision positioning of underwater targets, the GPS sonobuoy technique has two bottlenecks: high precision system clock synchronization and high accuracy time delay estimation.
以大量的水下目标辐射噪声资料为依托，借助高阶累积量分析法，研究了目标信号的非高斯特性。
For the radiation noises from underwater targets apparently contain non-Gaussian ingredients, their non-Gaussion features were studied through high-order cumulants.
并根据一定的通信系统参量，利用蒙特卡罗方法模拟了水下目标接收信号的时间和空间分布。
With certain communication system parameters the temporal and spatial distributions of the received signal from submerged platform are simulated using Monte Carlo method.
线性调频信号可能将成为水下目标强度宽带测试的一种主要信号形式。
LFM signal will likely become the main signal form in underwater target strength broadband test.
论文首先对水下机器人传感器信息做小波变换，利用小波变换极值点来检测信号的突变故障。
Firstly, the wavelet transform is undertaken for the sensor information of the underwater vehicle, and the extreme points of the wavelet transform are used to detect the jumping faults of the signal.
研究了基于小波域多尺度树结构的水下噪声信号统计概率模型的建模方法。
The statistics modeling method of underwater noise signal is studied. The hidden Markov tree model in wavelet domain is adopted to model the sea noise and various ship-radiated noise.
水下目标回声信号的检测是主动声纳目标识别的重要内容。
Detection of echo signal is an important part of underwater object recognition.
以非线性动力学理论中的相空间重构理论为基础，利用延时法对水下噪声时间序列信号进行了相空间重构。
Time delay method was used to reconstruct the phase space of underwater noise time series based on nonlinear dynamics theory.
设计并实现了一套空中探测水下声信号的实验装置。
A research was made on detecting underwater acoustic signals using laser.
该系统能够实时实现信号的空间处理和时间处理等，并在水下弱信号检测中得到应用，取得了良好的结果。
The system can realize the space signal processing and real time signal processing. It has been successfully applied in underwater weak signal detection.
通过声压与振速的联合信号处理，充分利用水下目标辐射噪声场的信息。
Through processing sound pressure combine with particle velocity, the information of underwater target radiation noise field is entirely used.
介绍了一种结合嵌入式系统、DSP系统和PC机系统，并且利用网络进行数据传输的水下声信号采集系统。
This article introduces a kind of underwater-acoustic signal gathering system which combines embedded system, DSP system, PC system and etc, and USES network to carry out data transmission.
在水下多源探测与跟踪系统中，信号源数目估计不准确对波达方向估计以及整个系统性能会产生严重影响。
In an underwater multi-source detecting and tracking system, the incorrect estimation of source number will do bad effect on DOA estimation and the whole system.
在水下多源探测与跟踪系统中，信号源数目估计不准确对波达方向估计以及整个系统性能会产生严重影响。
In an underwater multi-source detecting and tracking system, the incorrect estimation of source number will do bad effect on DOA estimation and the whole system.
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