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相关概念视频

Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

193
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...
193
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

370
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...
370
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

14
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
14
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

433
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...
433
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

18
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
18
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

310
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...
310

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相关实验视频

Updated: May 10, 2025

Electroantennography-based Bio-hybrid Odor-detecting Drone using Silkmoth Antennae for Odor Source Localization
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基于相差信息的无人机群的相对DOA估计方法,没有固定.

Yi Han1, Jingjing Zhang2,3, Jinglin Luo4

  • 1School of Intelligent Manufacturing and Equipment, Shenzhen Institute of Information Technology, Shenzhen, 518172, China.

Scientific reports
|April 24, 2025
PubMed
概括

这项研究引入了一种超宽带宽 (UWB) 方法,用于无人机 (UAV) 群,在没有GPS的情况下估计到达方向 (DOA). 基因算法 (GA) -UWB方法在具有挑战性的环境中提高了准确性.

关键词:
所有方向的DOA估计没有GNSS的环境.没有基站,没有基站.无人机群是无人机的群体

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科学领域:

  • 机器人和控制系统 机器人和控制系统
  • 信号处理 信号处理
  • 导航和定位 导航和定位

背景情况:

  • 无人驾驶飞行器 (UAV) 群需要在全球导航卫星系统 (GNSS) 拒绝的环境中强大的相对导航.
  • 现有的方法往往依赖于固定基础设施,或者在飞机间到达方向 (DOA) 估计中缺乏精度.
  • 缺乏可靠的定位挑战了协调的群体行动.

研究的目的:

  • 开发一种新的方法,用于在没有GNSS的情况下运行的UAV群体中进行机际DOA估计.
  • 为了使每个无人机能够作为移动基站进行增强定位.
  • 在噪音条件下提高相对DOA估计的准确性和成功率.

主要方法:

  • 提出了一个基于超宽带宽 (UWB) 的系统,无人机在其中充当发射器和接收器.
  • 通过使用正规四面体数组,推导出用于全方向DOA估计的理论框架.
  • 采用遗传算法 (GA) 用相差信息来解决相位模两可的情况.

主要成果:

  • 拟议的GA-UWB算法与宽相UWB (WP-UWB) 方法相比显示出更高的性能.
  • 模拟证实了基于UWB的方法在没有GNSS的场景中的有效性.
  • 该算法取得了更高的成功率,特别是考虑到时间和相差测量的噪声.

结论:

  • 基于UWB的方法与基于GA的阶段模糊性分辨率为无人机群中的机际DOA估计提供了可行的解决方案.
  • 这种方法在GNSS无法使用的环境中增强了群体导航能力.
  • 该方法在提高合作无人机操作的可靠性和准确性方面具有前景.