Based on the introduction of match filtering, a method of simulation focusing on the actual echo under pulse compression and the results are given combining with the projet practice. 在介绍匹配滤波工作原理的基础上,结合工程实际,给出了实际目标回波脉压的仿真方法及所能达到的性能指标。
Aiming at the deficiencies of single echo ultrasonic distance measurement and referring to the pulse compression technology in radar, the realization method for ultrasonic spread spectrum distance measurement based on PRBS ( m Sequence) is introduced. 针对单脉冲回波方式的超声测距方法存在的缺陷,借鉴雷达中的脉冲压缩技术,介绍了基于伪随机二进制序列(m序列)的超声扩频测距实现方法。
Then discussing the phase information and Doppler characteristic of target echo wave in the pulse Doppler phase radar. 并且讨论了在脉冲多普勒相参体制雷达下目标回波的相位信息以及目标信号的多普勒谱特性。
Steering exposure time of a camera through control electron shutter with laser echo pulse is an effective method for inhibiting background noise. 用激光回波脉冲控制电子快门来操纵摄像机的曝光时间,是抑制背景噪声的一种有效方法。
Some methods of enhancing detection performance in dealing with the single pulse echo signal and the multi-period pulse bunch echo signal by accumulating are summarized. 阐释了单个脉冲回波信号和多周期脉冲串回波信号,利用积累来提高检测性能的多种方法。
Simple method for monitoring spin echo and determination of relaxation time in pulse NMR 自旋回波的简易观测方法及共振弛豫分析
Base band radar transmits a narrow pulse sequence, and in the same way receives echo pulse, then converts high frequency echo pulse into low frequency image, from which target information is obtained, and used to detonating warhead. 基带雷达引信发射一个超窄脉冲序列,用采样的方法接收目标回波脉冲,把高频回波脉冲变换成低频图象,从低频图象中提取目标信息,并在精确的距离上引爆战斗部。
Wide-band radar has high range resolution. When illuminated by it, targets appear to be multi-scattering centers and occupy multi-range cells in range dimension. Echo signal forms one dimensional range profile after pulse compression. 宽带雷达具有高的距离分辨率,目标被其照射后呈现多散射中心,在径向上表现为多个距离单元,回波信号脉冲压缩后形成目标的一维距离像。
The scheme accomplishes range tracking by adopting three range gate tracking to make middle gate always centered at echo pulse center through feedback circuit and deviation calculation circuit. 该方案采用三波门跟踪,通过偏差计算电路和反馈控制电路使中间波门中心始终对准目标回波脉冲中心,完成距离跟踪。
Echo pulse ratio and attenuation of ultrasound method for the measurement of concentration of suspended particles 回波脉冲比值与声衰减法测量悬浮颗粒浓度
Echo Simulation of Air Pulse-Doppler Radar 机载脉冲多普勒雷达回波信号模拟
DAC curve ● Programmed the whole software of ultrasonic phased array testing system, including human-machine interactive interface, the echo pulse's wave display, standard DAC curve's fitting and the USB communication. 编制了整个超声相控阵探伤系统的软件部分。完成了人机界面的交互设计、采样回波的波形显示、标准DAC曲线的拟合、上位机与MCU之间的USB通讯程序等。
The detection of echo signals is an important technique in pulse laser fuzes. 回波检测是脉冲激光引信工作的关键环节之一。
Study on Digital Detection Technique of Weak Echo Signals in Pulse Laser Fuzes 脉冲激光引信微弱回波信号数字检测技术研究
And the waveform of the pulse echo is discussed in the software of intelligent pulse echo treatment system, and the some examples of the echo analysis methods are presented in the software. 最后,对智能回声接收软件的波形分析法进行了简单的介绍,并给出了一些智能化处理的实例。
To investigate the problem of serious influence of compressed echo pulse widening caused by target's high velocity on the range profile quality, a correction method based on a fast estimation of multi-component LFM parameters is proposed. 针对目标高速运动引起回波脉冲压缩结果展宽从而严重影响一维距离像质量的问题,提出了基于多分量调幅线性调频信号参数估计的校正方法。
The interface between radar signal processor and radar simulator is discussed for a biphase coded radar. The method of producing BK code and M code radar echo signals is analyzed while the pulse repeat period is changing. 研究二相编码体制雷达信号处理机与雷达模拟器之间的接口方式,以及在变脉冲重复周期时巴克码和M序列码雷达回波信号的产生方法。
This paper describes the radar data acquisition and data processing, and analyze the principles of continuous sampling of echo signals interrupted by the blank pulse. 分析了被压地波脉冲中断的雷达回波信号可以进行连续采样的原理;
The laser echo acquiring and processing technique is a key technique in laser pulse imaging. 激光回波信号采集和处理技术是激光脉冲成像的关键技术。
Testing bearing pile with low strain method will be of some defects in the bottom if the echo from the tip has the same phase as the pulse at the top. 用低应变法检测嵌岩桩,若桩底出现明显同相反射,多数因桩底缺陷引起。
Besides single "high light" echo, according to the forming mechanism of echo, puts forward that under the many high light echo circumstances, the steady scattering condition is that the incident pulse width must be greater than the extended width of narrow pulse echo. 除了单亮点回波外,根据回波形成机理,提出多亮点回波情况下建立稳态散射入射波脉冲的宽度必须大于窄脉冲回波的扩展宽度。
Digital signal processing method is presented to detect target, because laser echo pulse is narrow and weak. 针对激光回波脉冲窄、弱等缺点,提出数字信号处理技术检测目标的方法;
Signal conditioning system is responsible for sending the initial pulse, detecting the echo signal, measuring the precision pulse interval, data filtering and processing. 传感器信号调理系统负责起始脉冲发送、脉冲驱动放大、回波信号检测、高精度脉冲时间间隔测量、数据滤波及处理等。
For the several kinds of radio near-sensing detection systems, in order to extract the relevant characteristics of the target accurately, the most important part is to process the echo signal. Pulse, Continuous-wave ( CW) are two typical radio near-sensing detection systems. 在无线电探测器的各种体制中,为了准确的提取出目标的相关特征,最主要的是对目标的回波信号进行信号处理。
Echo signal is high frequency and narrow pulse width signal, the data acquisition method is based on equivalent-time sampling technique, and high-frequency of echo signal is converted to low-frequency signal by the receiver circuit, and then sent to the A/ D converter for data acquisition. 回波信号是高频窄脉冲信号,接收电路主要利用等效时间采样技术对回波信号进行采集,让高频信号变为低频信号,在送至A/D转换器进行数据采集。
In the course of data processing and echo detecting a single echo pulse detection algorithm, the local median filter and of four different echo characteristic time detecting method are used to determine the most accurate echo detection algorithm. 本系统在数据处理和回波检测过程中,采用单次回波脉冲检测算法、局部中值滤波并通过四种不同的回波特征时间进行回波检测,确定了精度最高的回波检测算法。
The ultrasonic echo signal processing method which based on the pulse of the reflection for echo signal processing is studied, which can analyze the defects of echo signal characteristics, their impact on the test specimen by the internal structure of the change. 本文采用基于脉冲反射法的超声回波信号处理方法对回波信号进行处理,使用该方法能够分析出缺陷对回波信号超声特性的影响及其被测试样内部结构的变化情况。
Generally, pulse compression radar must have a wide emission pulse to increase detection range, but it must have narrower echo pulse to get higher resolution. 通常,脉冲压缩雷达要增大探测距离,就必须有较宽的发射脉冲;而要得到较高的分辨力,就要有较窄的回波脉冲。