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相关概念视频

Field Application of Global Positioning System01:28

Field Application of Global Positioning System

306
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
306
Errors in Global Positioning System01:26

Errors in Global Positioning System

321
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
321
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

376
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...
376
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

334
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
334
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

451
The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
451
The Midpoint Formula01:24

The Midpoint Formula

614
In coordinate geometry, determining the central point between two locations is common. This central point, or midpoint, lies exactly halfway along the line segment connecting two points in a two-dimensional space. It has applications in mathematics, physics, engineering, and various planning disciplines.Given two points labeled as A (x1, y1) and B (x2, y2) on a coordinate plane, a straight line segment can be plotted between them. The midpoint, labeled point M, divides this segment into two...
614

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相关实验视频

Updated: Jan 11, 2026

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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通过Wi-Fi RSSI跟踪破坏位置隐私.

Mariana Cunha1,2, Ricardo Mendes3, Yves-Alexandre de Montjoye4

  • 1CRACS/INESCTEC and Department of Computer Science, University of Porto, Porto, Portugal. mccunha@dei.uc.pt.

Scientific reports
|November 10, 2025
PubMed
概括
此摘要是机器生成的。

来自Wi-Fi的接收信号强度指标 (RSSI) 可以以超过90%的准确度推断用户的存在和位置上下文. 这突显了重大隐私风险,以及需要更好地保护无线连接数据.

关键词:
指纹的风险指纹的风险移动设备 移动设备隐私 隐私 隐私 隐私 隐私 隐私收到的信号强度指示器 (RSSI)没有Wi-Fi的Wi-Fi.

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Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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相关实验视频

Last Updated: Jan 11, 2026

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
06:43

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Published on: May 2, 2018

7.4K
Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

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科学领域:

  • 计算机科学 计算机科学
  • 网络安全 网络安全
  • 移动计算 移动计算

背景情况:

  • 无处不在的Wi-Fi和移动设备产生了大量的数据,引发了隐私问题.
  • 由于位置推断风险,现有的限制限制了访问像BSSID这样的Wi-Fi连接数据.
  • 其他无线数据源,如RSSI,仍然是可访问和潜在的可利用的.

研究的目的:

  • 调查使用Wi-Fi接收信号强度指标 (RSSI) 来推断用户的存在和位置的可行性.
  • 评估将RSSI数据与其他特征 (例如一天的时间) 相关联的潜力,以推导语义上下文.
  • 分析与可访问的RSSI测量相关的隐私影响和指纹风险.

主要方法:

  • 从各种常见地点的移动设备收集和分析Wi-Fi RSSI测量结果.
  • 开发预测模型,将RSSI数据与时间特征 (一天中的小时) 相关联,以推断用户的存在.
  • 评估了这些模型在预测用户位置和语义上下文方面的性能.

主要成果:

  • 证明Wi-Fi RSSI可以有效地推断随着时间的推移在特定位置的用户存在.
  • 当将RSSI与当天的小时等上下文特征相关联时,实现了超过90%的预测性能.
  • 鉴定出严重的隐私风险和大量的指纹风险,原因是RSSI数据不受保护.

结论:

  • 无线网络RSSI作为一个可行的,但未受保护的来源,用于推断用户位置和活动上下文.
  • 这些发现强调了关于收集和使用RSSI数据的增强隐私措施的关键需求.
  • 需要进一步的研究来开发针对基于RSSI的位置跟踪和指纹的强大防御.