基于FMCW雷达的移动状态下降方向检测
Lei Ma1, Xingguang Li1, Guoxiang Liu1
1School of Electronic Information Engineering, Changchun University of Science and Technology, Changchun 130022, China.
Sensors (Basel, Switzerland)
|June 10, 2023
概括
这项研究引入了一种使用频率调制连续波 (FMCW) 雷达检测下降方向的新方法. 该系统达到96.27%的准确性,有助于更快的医疗救援和减少伤害.
科学领域:
- 医疗技术 医疗技术 医学技术
- 信号处理 信号处理
- 人工智能的人工智能
背景情况:
- 跌倒检测对于及时的医疗干预和尽量减少二次伤害至关重要.
- 现有的方法可能缺乏可移植性或损害用户隐私.
- 准确的落地方向识别可以提高救援计划和效率.
研究的目的:
- 开发一种使用FMCW雷达检测落方向的便携式和保护隐私的方法.
- 使用范围时间 (RT) 和多普勒时间 (DT) 功能分析运动和下降状态.
- 通过消除噪音和异常值来提高下降方向检测的可靠性.
主要方法:
- 利用FMCW雷达捕捉运动和跌落事件期间的范围时间 (RT) 和多普勒时间 (DT) 功能.
- 开发了一个双分支卷积神经网络 (CNN) 来分析提取的特征和分类掉落方向.
- 实现了一个模式特征提取 (PFE) 算法,以消除RT和DT图,提高模型可靠性.
主要成果:
- 拟议的方法实现了对不同下降方向的96.27%的高识别精度.
- 该系统有效地区分了基于雷达信号的各种运动和下降状态.
- 该PFE算法成功地减轻了噪声和异常值,提高了检测模型的稳定性.
结论:
- 新的FMCW基于雷达的方法提供了准确可靠的降落方向检测.
- 这项技术可以大大帮助医务人员制定及时的救援计划.
- 该系统的可移植性和保护隐私的性质使其适合广泛应用.
相关概念视频
01:24Relative Motion Analysis - Velocity
396
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
396
01:25Relative Motion Analysis using Rotating Axes
490
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
490
01:10Relative Motion Analysis - Acceleration
385
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
385
01:22Relative Motion Analysis using Rotating Axes - Acceleration
357
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
Time differentiation is...
357
01:24Absolute Motion Analysis- General Plane Motion
243
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
243
01:29Relative Motion Analysis using Rotating Axes-Problem Solving
425
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
Here, in order to determine the magnitude of velocity and acceleration for point...
425