第二种是运用多种正交变换结合的算法对回波进行特征提取工作。
The other one is to apply multiple sorts of orthogonal signal transformation to extract the information of the targets.
提出了一种先对回波信号进行多普勒补偿后再进行相干积累的方法。
The method in which coherent accumulation is carried out after the echo is compensated by a Doppler frequency shift is introduced.
该算法利用相邻回波的多普勒频率基本相等的特性对回波进行对消；
The returns can be cancelled through the algorithm which utilizes the characteristics that neighbouring returns have approximately equal Doppler frequency.
由于其信号带宽宽，对回波信号进行实时脉冲压缩处理是个技术难点。
Because of its wide bandwidth, real-time pulse compression of returned signal is always difficult.
并设计了先对回波信号进行高速采样然后同步累加进行脉冲积累的方案。
The according pulse accumulation method is designed and realized, i. e. digitalizing the echo and synchronously accumulating them in RAM.
因此，数据采集后需对回波信号进行适当的反演，从而获得大气消光系数。
So, it is important to processing the return signal for getting extinction coefficient.
论述了各种同步误差的来源，分析了引入各种同步误差后对回波相位的影响；
The sources of variant synchronization errors are discussed, the analysis of echo phase effected by variant errors is given.
提出了对回波信道的初估计并利用变换域LMS算法进行信道跟踪的一种方案。
Echo channel estimation and the tracking of channel using the transform domain LMS algorithm are introduced in this article.
提出了对回波信号逆滤波以恢复目标特征及采用匹配滤波来抑制成像旁瓣的方法。
An inverse filter for return signal to restore target signature and a restraining image sidelobe method used matched filter are provided.
采用该映射方法，在普通的PC机上即可完成实时坐标变换及对回波采样数据的进一步处理。
By this mapping method, the real time coordinate conversion and processing of the echo signal become possible to perform for an ordinary PC.
在高帧率超声成像算法中，对回波信号进行有限衍射波束加权处理占用了成像中大部分计算时间。
In the a high frame rate (HFR) ultrasonic imaging system, the weighting process by limited diffraction beams on echo signal takes the most of the calculation time for constructing an image.
该方法利用单脉冲雷达空间双路接收的特点，采用时-空二维联合处理的方法对回波信号进行处理。
This method utilizes the multiple receiver of monopulse tracking radar, and adopts the time-space processing method to process the echo.
基于成对回波理论，针对波导色散对宽带信号脉压的影响进行了理论分析，推导出了具体的数学表达式。
Based on the paired-echo theory, the effect of waveguide dispersion on performance of the wideband signal pulse compression was analyzed and the corresponding expression derived.
文章针对激光弱小回波信号的低信噪比，提出了运用数字信号处理技术对回波信号进行处理的方法，并进行了一系列仿真和计算。
In the paper the methods to process weak echo by using DSP technology based on low SNR of laser weak echo are presented. And the methods are simulated and calculated.
新模型不仅考虑到目标是光学区复杂目标的情形，而且分析了目标运动形成的多普勒频率对回波数据的影响，使动态目标雷达回波模拟数据更接近于真实。
The new model considers the state that the target is a comprehensive target, and includes the influence of the targets'movement. The data based on this model is more actual than the stop-and-go model.
研究结果表明：回波强度受导引头光路中光学镜头的相对孔径、摄像管靶面倾斜和离焦的影响较大；扫描激光光束的入射角等因素对回波强度也有一定的影响。
Research results show that the relative aperture of optical lens, the incline and defocusing of reflection plane in TV seeker optical system reduce the intensity of the "cat's eye" reflection.
分析了超宽带冲激脉冲雷达与连续波雷达的不同的回波特性，指出冲激脉冲雷达对超低空目标探测的潜在优势。
Differences of echo characteristic between impulse radar and continuous wave radar are analyzed, and the potential of UWB impulse for Super-Low-Altitude target-detection is remarked.
分析了高速运动目标的逆合成孔径雷达（ISAR）回波信号模型和目标高速运动对ISAR信号处理的影响。
The inverse synthetic aperture radar (ISAR) echo signal model of fast-moving target and the effect of target fast-moving on ISAR signal processing were analyzed.
普通声纳系统旋转它的电波，可连续或根据运营商的控制，以及对特定回波的最大响应状态被记录为与目标间的联系。
The normal sonar system rotates its beam, either continuously or under the operator's control, and the position of maximum response to a particular echo is taken as the bearing of the target.
根据三脉冲激光雷达回波信号的特点，对信号进行差分滤波和匹配滤波处理，信噪比提高约1.5倍；
According to laser radar echo characteristic, the difference filter and the match filter were adopted. As a result, the SNR is advanced about 1.5 times.
本方法对目标回波信号采用了相干视频模拟法，在视频上模拟目标回波的多普勒频率。
In the method, the target reflected signal is generated by the way of coherent video simulation and the Doppler frequency of target is simulated on video.
结果表明：该方法提取的缺陷回波信号特征值，其可分性测度均值达91.7%，从而证明该方法对超声检测缺陷回波信号的特征提取是相当有效的。
The average value of separability measure is as high as 91.7%, which indicates that this method is quite effective in the feature extraction of ultrasonic flaw echoes.
通过对比研究激光对漫反射大目标、小目标和“猫眼”光学镜头的回波信号，给出激光主动侦察原理：对目标的距离测量应用脉冲激光测距原理实现；
Theprinciples of the laser active reconnaissance are explained via the comparison of the echo signal. target ranging isrealized by adopting the principle the pulse laser ranging.
利用等效相位中心原理建立了天线斜置情况下三通道运动目标回波信号模型，给出了天线倾斜角对动目标检测、最小可检测速度和盲速的影响。
The echo model of moving target is established based on three channels with the slant-placed antennae in terms of the equivalent phase center principle.
根据2003年几次强对流天气的观测资料，对其中三体散射长钉、二次回波旁瓣回波等虚假回波进行了分析。
The analysis of the virtual echo such as three -body scatter spike echo, the secondary echo, the side -lobe echo is given echo based on observational re cords of severe convectional weather in 2003.
该记录器对海底回波信息的记录是实时的。
The returned signal from the sea bottom can be recorded by the recorder on a real time basis.
结果表明，渐消记忆滤波器通过引入旧数据对图像更新的影响，使得回波图像中目标位置的变化具有连续性。
The results show that the fading memory filter makes the position of target in echo images continuous by introducing the influence of old data on image update.
综合分析龙卷涡旋特征(TVS)、中气旋(m)和径向速度场上的速度对是识别龙卷回波的有效方法。
Comprehensive analysis on the characteristics of tornado Vortex (TVS), mesocyclone (m) and radial velocity Pairs are effective ways to identify tornado echoes.
综合分析龙卷涡旋特征(TVS)、中气旋(m)和径向速度场上的速度对是识别龙卷回波的有效方法。
Comprehensive analysis on the characteristics of tornado Vortex (TVS), mesocyclone (m) and radial velocity Pairs are effective ways to identify tornado echoes.
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