doppler超声介绍
时间: 2023-11-18 15:27:05 浏览: 28
Doppler超声是一种医学成像技术,利用声波反射的原理来评估血流速度和方向。它可以帮助医生检测血液循环问题,如血栓、动脉狭窄和心脏瓣膜问题等。Doppler超声可以通过放置一个小型传感器在身体表面上,向身体部位发射高频声波,然后记录声波反射的速度和方向,生成可视化的图像和声波频率变化的图表。这种技术非常安全,无辐射,对身体没有任何损害。它已广泛应用于心血管、妇科、产科、肝脏、肾脏等领域。
相关问题
Micro-Doppler
微多普勒效应是指在雷达信号返回中,由于目标物体上的微小运动引起的频率偏移现象。[1]具体来说,当目标物体上的某一部分以非零速度运动时,这种运动会在雷达波返回的信号中引起频率的变化,这就是微多普勒效应。
关于微多普勒效应,有几本参考资料提供了详细的解释。《The Micro-Doppler Effect in Radar》一书从多普勒效应开始讲起,介绍了微多普勒效应的相关内容。该书共分为六章,包括多普勒效应和微多普勒效应的介绍,雷达中微多普勒效应的应用基础,刚体和非刚体运动的微多普勒效应,以及微多普勒特征分析与解释等内容。
另外,《Micro-Doppler Effect in Radar: Phenomenon, Model, and Simulation Study》一书是对《The Micro-Doppler Effect in Radar》的缩减版,介绍了微多普勒效应的现象、模型和仿真研究。此外,《Advances in Applications of Radar Micro-Doppler Signatures》则介绍了微多普勒效应在多种应用场景中的应用。
综上所述,微多普勒效应是雷达信号返回中由于目标物体上的微小运动引起的频率偏移现象。有多本参考资料提供了对微多普勒效应的详细解释和研究。
range-doppler
Range-Doppler is a technique used in radar signal processing to determine the range and velocity of a target. It works by transmitting a radio frequency (RF) pulse towards the target and then detecting the reflected signal. By processing the received signal, it is possible to determine the range to the target based on the time delay between the transmitted and received signals. Doppler shift, which is caused by the relative velocity between the target and the radar, can also be extracted from the received signal. By combining the range and Doppler information, the speed and direction of the target can be determined. Range-Doppler processing is widely used in radar systems for various applications, including military, weather, and air traffic control.