The inherent distance ambiguity of pulse Doppler radar increases the requirement of Doppler filter group to the clutter-suppression ability.
脉冲多普勒雷达的固有距离模糊，增大了多普勒滤波器组对杂波抑制能力的要求。
This article introduces the basic principle of radar narrow band doppler filters, puts up the designing method of the hardware circuit and analyzes the filter accuracy.
介绍了采用数字方法实现雷达窄带多普勒滤波器组的基本原理，给出了硬件电路的设计方法，并对滤波器精度进行了分析。
In medical Doppler ultrasound systems, a high-pass filter is usually employed to remove wall clutter components which may also remove the information of the low velocity blood flow.
医学超声多普勒系统的高通滤波器在消除血管壁搏动带来的回波干扰时，也滤除了低速血流信息。
Objective in vivo study was performed using color Doppler ultrasound to evaluate the effect of artery filter on swine's carotid blood flow.
目的应用彩色多普勒超声观察动脉滤器对活体猪颈动脉血流的影响。
This paper presents a simple tracking filter circuit, which is applicable to Doppler radar sets and consists mainly of a switched bandpass filter and a phase-locked loop.
本文提出一种简单的跟踪滤波器电路，该电路可用于多普勒雷达，主要由开关式带通滤波器和锁相环组成。
In order to detect the low-speed weak target in the stationary sea clutter, the clutter-whitening processing module is proposed to replace the conventional MTI filter and Doppler filter bank.
为了检测平稳海杂波中的低速弱目标，本文引入杂波白化处理模块取代雷达常用的MT I滤波器和多普勒滤波器组。
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。
The reason of Doppler migration and the restraint of conventional Doppler filter were analyzed firstly.
分析了多普勒走动出现的原因，以及常规多普勒滤波器的限制。
Objective To evaluate the feasibility and clinical value of color Doppler flow imaging(CDFI) guided inferior vena caval filter insertion(IVCFI).
目的探讨超声引导经皮穿刺下腔静脉滤器置入（IVCFI）术的可行性、安全性和临床实用价值。
Objective Transcranial Doppler (TCD) can be used to monitor microembolic signals (MES) in different procedure phases during filter-protected carotid angioplasty and stenting(CAS).
目的应用经颅多普勒超声（TCD）动态观察脑保护滤网下颈动脉支架成形术中各操作阶段所产生的微栓子信号（MES）数量。
Objective Transcranial Doppler (TCD) can be used to monitor microembolic signals (MES) in different procedure phases during filter-protected carotid angioplasty and stenting(CAS).
目的应用经颅多普勒超声（TCD）动态观察脑保护滤网下颈动脉支架成形术中各操作阶段所产生的微栓子信号（MES）数量。
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