These signals provide an important reference of the gain of antenna, the time reference, the phase reference and the frequency of carrier wave for generating stimulant echo signal.
这些信号分别为模拟回波信号的生成提供了天线增益大小、时间基准、相位基准和载波频率大小等重要的参考信息。
In processing of array signal, Direction of Arrival (DOA) of target can be obtained by extracting spatial frequency of echo.
在阵列信号处理中，提取回波信号中的空间频率，可以得到目标的方位信息。
By comparison with simple shape targets, the echo strength of the complex targets versus frequency and range is more complex.
与简单形状目标相比，复杂目标的回声强度随频率和距离的变化更为复杂。
The characteristics of the test signals were analyzed and weak defect echo signals were successfully extracted by cut-off frequency technique.
分析了检测信号的特征，并采用截止频率法成功地提取了微弱的缺陷回波信号。
Doppler frequency shift observation of ionospheric high frequency echo is an important method for studying ionospheric disturbances.
电离层高频反射回波的多普勒频移观测是研究电离层扰动的一个重要方法。
Besides amplitude, phase and Doppler frequency, polarimetric information is the fourth characteristic in the radar echo.
雷达回波信号中，除幅度、相位和多普勒频移外，还存在第四特征——极化信息。
In a certain medium structure, the echo energy transmission coefficient changing with the ultrasonic testing frequency is studied and the maximum magnitude is obtained.
得出了在被检测结构一定的条件下，大的回波能量透射系数对应有一最佳检测频率。
The basic work principle of a certain kind of Doppler radar is introduced, the relation between the echo Doppler frequency and other parameters is given.
介绍了多卜勒导航雷达的基本工作原理，推导了回波信号多卜勒频移与系统其它参量间的关系。
The speed of moving-target was measured based on the principle of PD frequency shift, and the range of moving-target on the pulse-echo principle.
利用多普勒频移原理实现了运动目标速度测量，利用脉冲回波测距原理实现运动目标距离测量。
The new methods can be used in both detection of FMCW echo and frequency estimation of correlative pulse train.
这两种方法既可用于多段线性调频连续波探测回波的积累检测，也可用于多个相参脉冲信号的积累与频率估计。
Then, the echo is shifted by introducing a phase ramp in the frequency domain.
然后，通过在频域引入一个相位斜坡来实现回波在距离向上的平移。
Fixing the spectrum width of the weather echo signals, we change theirs mean Doppler frequency and filter them using regression filter. After filtering, we analyze the attenuation of them.
在天气回波信号谱宽固定的情况下，通过改变天气回波信号的平均多普勒频率，分析了回归滤波器对它的衰减情况。
A way to measuring the vector miss distance using echo signal from Multiple Frequency CW-Tracking Radar is described in this paper.
本文详细介绍了利用多频连续波测量雷达回波信号进行脱靶量测量的方法。
Using the actual collected radar echo signals, we analyze the ground clutter suppression performance of the adaptive Gaussian frequency filter.
针对实际采集的雷达回波信号，分析了自适应高斯频域滤波器的地物杂波抑制性能。
The frequency response of the transducers is measured experimentally using laser ultrasound and a pulse echo reflecting method. The spectral analysis results are compared and analyzed.
由激光超声方法和自发自收脉冲反射法实验测定了所制作的换能器的频率响应，并比较了频谱分析结果。
Firstly, we introduce the radar equation of weather radar, the basic principles of detection weather targets, the time and frequency domain properties of weather radar echo and its simulation methods.
首先简要介绍了气象雷达的雷达方程、气象雷达探测气象目标的基本原理、气象目标回波的时域频域特性和气象回波信号的模拟方法。
Phase errors is introduced in echo demodulation process because of the frequency synchronization error, and then, the final focus result will be deteriorated.
在接收端解调过程中，该频率同步误差会引入一定的相位误差，进而影响下一步的成像处理。
The complex data samples are directly extrapolated to obtain the extrapolated echo data in the frequency domain.
对于频域，直接对散射场回波复数据进行外推，可获得外推散射场。
The chirping frequency of the pulsed echo from human tissue under normal condition is formulated. It will be helpful for the design of a chirping receiver.
本文专为迁频接收机的设计推导了在常态条件下人体中脉冲回声的频率迁移量的公式。
To suppress ionospheric clutter in the echo signal of high frequency surface wave radar (HFSWR), a method to suppress clutter based on time-frequency analysis and eigenvalue decomposition is proposed.
针对高频地波雷达回波信号中的电离层杂波，提出了利用时频分析与特征值分解抑制杂波的方法。
This paper analyzes the technology with intra-pulse chirp and inter-pulse stepped frequency to obtain high-resolution range profile. The echo expressions of static and moving targets are derived.
本文分析阐述了利用脉内调频、脉间跳频技术获取距离高分辨一维成像的可行性，导出了静止目标和运动目标的回波表达式。
The research would be summarized as follows:(1) MMWLFMCW radar target echo signal expressions are derived in the time and frequency domain respectively.
本文的主要内容包括以下几个方面：（1）推导了毫米波LFMCW雷达目标回波信号在时域和频域上的表达式；
For this purpose they generate a high frequency ultrasonic pulse the echo of which is detected and evaluated by the sensor.
为此，他们产生高频率的超声波脉冲回波是由传感器检测和评估。
High frequency ground wave radar for near ocean inspection and ocean remote sensor is a method that use ocean echo wave Dopier spectrum to deduce the parameters of ocean situation.
高频地波雷达近海监测和海态遥感技术是一种利用海洋回波多普勒谱反演海态参数的方法。
When the radar seeker transmits several different frequency pulses, the echo amplitude of the target follows the Rayleigh distribution and that of the decoy is assumed fixed.
当导引头雷达发射多个不同频率的脉冲信号时，在一定的检测处理时长内目标回波信号幅度服从瑞利分布，而诱饵干扰信号则是幅度固定的。
The transmission rule of the lamb wave in the structure of the flexible joint is discussed, and the ultrasonic pulse echo is analyzed in the time-field and frequency-field.
本文首先分析了板波诱发纵波在柔性接头构件中的传播规律，对原始回波信号进行时域和频域分析。
Both theoretical analyses and simulation results indicate that time-frequency mixed algorithm could generate sequential SAR echo waveform simulation data in real time.
理论分析和仿真结果表明，时频混合算法能够连续、实时地产生SAR模拟回波数据。
The result shows that in order to obtain the strong echo signal, a suitable selection of the ultrasonic transducer operating frequency is necessary.
由此表明，选择合适的声发射换能器，有助于提高液位检测回波信号的强度。
The arithmetic formulas for sine wave, linear frequency modulation signal, V-style frequency modulation signal, white noise signal, reverberation signal and echo signal are given by their definition.
根据信号类型的定义，给出了正弦信号、线性调频信号、V型调频信号、白噪声、混响和回波信号的合成公式。
Methods The manifestation, internal echo, the L/T ratio, CDFI and RI frequency spectrum feature of the superficial lymph nodes were studied with high frequency and color Doppler ultrasound 89 cases.
方法本组89例，应用高频率的彩色多谱勒超声检查肿大淋巴结的形态及内部回声、纵横比（L/T）、彩色多谱勒血流显像（CD FI）及阻力指数（RI）的频谱特征。
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