Related Experiment Video
Updated: Nov 23, 2025
06:52
An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
Published on: May 26, 2020
8.3K
iBeacon Indoor Positioning Method Combined with Real-Time Anomaly Rate to Determine Weight Matrix
Yu Guo1, Jiazhu Zheng1, Weizhu Zhu1
1Civil Engineering College, Nanjing Forestry University, Nanjing 210037, China.
Sensors (Basel, Switzerland)
|December 30, 2020
Summary
This study introduces an improved indoor positioning system using iBeacon technology, anomaly detection, and a weighted Levenberg-Marquardt algorithm. The method enhances accuracy by filtering signal errors, achieving precise location determination.
Area of Science:
- Engineering
- Computer Science
- Signal Processing
Background:
- Accurate indoor positioning remains a challenge.
- Existing methods often struggle with signal interference and noise.
Purpose of the Study:
- To develop a robust indoor positioning method using iBeacon technology.
- To enhance positioning accuracy by integrating anomaly detection with a weighted algorithm.
Main Methods:
- Utilized iBeacon technology for data collection.
- Employed the isolation forest algorithm for anomaly detection in Received Signal Strength Indicator (RSSI) data.
- Applied a weighted Levenberg-Marquardt (LM) algorithm with a dynamically generated weight matrix.
Main Results:
- Achieved an average positioning error of 1.540 m and an RMSE of 1.748 m.
- 85.71% of positioning errors were below 3 m.
- Demonstrated significant RMSE reduction compared to three other methods (38.69%, 36.60%, 29.52% lower).
Conclusions:
- The proposed iBeacon-based method effectively improves indoor positioning precision.
- The integration of anomaly detection and weighted LM algorithm offers practical advantages for real-world applications.
Related Concept Videos
01:09Apparent Weight
9.4K
True weight is the measure of the gravitational force acting on an object. However, if the object accelerates, its measured weight is different from its true weight. Similar observations can be made when the object is submerged in water. An object's weight in water is its apparent weight, which is equal to the difference between its true weight and the buoyant forces.
Consider a person standing on a bathroom scale inside an elevator. If the scale is accurate at rest, its reading equals the...
Consider a person standing on a bathroom scale inside an elevator. If the scale is accurate at rest, its reading equals the...
9.4K
00:57Weighted Mean
6.0K
While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
6.0K
01:12Measuring Acceleration Due to Gravity
983
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
983
01:03Finding the Center of Gravity
4.1K
The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate...
4.1K
01:30Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device
259
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...
259
01:28Apparent Weight and the Earth's Rotation
3.9K
Since all objects on the Earth's surface move through a circle every 24 hours, there must be a net centripetal force on each object, directed towards the center of that circle. The points of the north and south poles are the only exception to this rule.
For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface....
For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface....
3.9K