但是，包含外部噪声、各种不同杂波和干扰的信号环境将大大限制探测性能和系统能力。
But the signal environment that includes external noise, different kinds of clutter and interference will significantly limit the detection performance and system capability.
在实际的雷达检测环境中，杂波、热噪声等产生的干扰功率通常是未知的。
In a realistic radar detection scenario, the disturbance power generated by thermal noise and clutter is unknown.
本文研究的雷达视频回波信号模拟与仿真是针对机载下视脉冲多普勒雷达，包括目标信号、地杂波信号和噪声信号的模拟与仿真。
In the thesis, the video echo of the airborne PD radar was simulated. The simulated echoes include the signals of the target, the ground clutter and the noise.
相关随机序列是描述随机噪声、杂波和干扰的主要工具，在卫星通信、常规雷达及星载雷达中有着重要应用。
Correlated random series is the mainly tool for describing the property of random noise, clutter and jamming, which is widely used in satellite communications, normal radar and spaceborne radar.
研究了用脉间步进频率雷达对杂波背景噪声下地面或海面动目标的探测。
This paper studies how to detect the moving targets on the land and sea surface in the background of clutters by using pulse-pulse step frequency radar.
研究了信号及杂波、噪声在信号处理之后的统计特性，并通过仿真系统产生了目标回波数据及检测背景噪声。
This paper also studies the statistics characteristic of signal, clutter and noise after the system disposal, and generates target data and detecting background noise using the simulated system.
提出了利用小波来去除雷达平面位置图像(PPI)的散点噪声，然后利用形态学原理构造目标结构元来滤除斑点噪声和杂波。
In this paper, wavelet is used to erase speckle noise in radar PPI, and the principle of morphology is used for building structure element to filter off the speckle noise and clutter.
经过相关检测后，图像序列中的噪声几乎完全被门限所抑制，只有极少数噪声像素、全部目标像素和一小部分杂波像素可以通过相关检测门限。
After correlation detection step, noise pixels in the image sequences are almost suppressed, and only target pixels and a few clutter pixels can pass the detection threshold.
阐述了视频回波信号、杂波及噪声的产生依据及方法。
Also, the sources and the methods of video echo signal, clutter and noise are introduced.
通过RLS自适应滤波器，背景杂波分量被准确地预测并从输入信号中去除，从而只剩下目标信号与残留噪声。
The clutter is predicted exactly and subtracted from the input signal by RLS adaptive filter, leaving components of the target signal in the residual noise.
该方法对提取目标回波信号、提升其信号强度、抑制杂波干扰和噪声有良好的效果。
This method is good for the echo signal is distilled and the intensity is advanced and the clutter and the yawp are restrained.
将旁瓣杂波合理等效为白噪声，处理目标频移落在旁瓣杂波区的情况。
To solve the problem of the targets signal located in sidelobe clutters area, the sidelobe clutters of LPRF PD radar is treated as noise.
海杂波指雷达波束照射到海面上后引起的后向散射杂波，是海防预警雷达的主要噪声干扰。
Sea clutter is the backscatter from fluctuant sea surface. Sea clutter is the major noise interference of seaborne radar.
利用相应的高层次模型，详细分析并仿真了电流源匹配误差和电流源输出阻抗对DAC的非线性误差nl、信号噪声失调比SNDR、无杂波动态范围SFDR的影响。
With corresponding models how the matching errors and output resistance of current source affect the NL, SNDR and SFDR of DAC is analyzed and simulated in detail.
着重从目标回波、海杂波、噪声三个方面对雷达回波信号进行了分析和建模。
This paper realize the radar echo signal analysis and modeling from three aspects: contain the target echo, sea clutter, rain clutter and noise.
首先分析了红外小目标、噪声及其杂波特性，提出了用小窗口的二维中值滤波进行背景估计；
Firstly, a background estimation method based on small window and two dimension median filter is presented after detail analysis of the model of small infrared target, noise and clutter.
提出了一种强噪声背景下弱小目标的快速检测方法，解决了在此背景下存在厚云层和大运动杂波的问题。
A new method of IR small dim target detection based on big clutter background was provided. It worked well in heavy cloud and big moving clutter background.
试验表明改进后的算法具有较好噪声、杂波抑制性能。
The experimental result shows that modified algorithm can filtrate effectively the noise and the clutter from the images.
SAR图像存在相干噪声以及水面背景杂波的复杂性，传统方法对于弱目标检测存在困难。
Because there is speckle noise in SAR image and the background clutter of water is usually very complex, weak target detection is a big challenge for conventional methods.
SAR图像存在相干噪声以及水面背景杂波的复杂性，传统方法对于弱目标检测存在困难。
Because there is speckle noise in SAR image and the background clutter of water is usually very complex, weak target detection is a big challenge for conventional methods.
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