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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...
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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,...
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Updated: May 25, 2025

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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Running Parameter Analysis in 400 m Sprint Using Real-Time Kinematic Global Navigation Satellite Systems.

Keisuke Onodera1,2,3, Naoto Miyamoto3, Kiyoshi Hirose3,4

  • 1Faculty of Education and Welfare, Biwako-Gakuin University, 29 Fusecho, Higashiomi 527-8533, Japan.

Sensors (Basel, Switzerland)
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

Real-time kinematic global navigation satellite systems (RTK GNSS) offer a new way to measure running parameters like step length and frequency. A velocity minima method using RTK GNSS provides accurate, drift-free sprint analysis for training optimization.

Keywords:
GNSSsprint runningstride frequencystride lengthvelocity

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Area of Science:

  • Biomechanics
  • Sports Science
  • Navigation Systems

Background:

  • Accurate measurement of running parameters (step length, step frequency, velocity) is crucial for optimizing sprint performance.
  • Traditional methods like 2D video analysis and inertial measurement units (IMUs) have limitations in precision and practicality for outdoor settings.
  • Real-time kinematic global navigation satellite systems (RTK GNSS) present a potential alternative for high-frequency kinematic data acquisition.

Purpose of the Study:

  • To introduce and evaluate two novel methods for estimating running parameters using 100 Hz RTK GNSS.
  • To compare the accuracy and reliability of these RTK GNSS methods against established 3D video analysis and IMU data.
  • To assess the suitability of RTK GNSS for detailed per-step sprint analysis, including curved sections and stride asymmetry detection.

Main Methods:

  • Two methods for estimating running parameters were developed using 100 Hz RTK GNSS data.
  • Method 1 identified mid-stance via vertical position minima; Method 2 utilized vertical velocity minima aligned with initial contact.
  • Measurements were validated against 3D video analysis and IMU data during 400 m sprints by collegiate sprinters.

Main Results:

  • Both RTK GNSS methods successfully estimated step frequency, step length, and velocity.
  • Method 2 (vertical velocity minima) demonstrated superior accuracy with lower RMSE for SF (0.205 Hz vs. 0.291 Hz) and SL (0.143 m vs. 0.190 m) compared to Method 1.
  • Method 2 showed higher correlation with reference data, better performance on curves, and more consistent detection of stride asymmetries.

Conclusions:

  • RTK GNSS, particularly the velocity minima approach (Method 2), provides a robust, drift-free, single-sensor solution for per-step sprint analysis.
  • This RTK GNSS method offers a practical and accurate alternative to IMU-based systems for outdoor running analysis.
  • The findings support the use of RTK GNSS for enhanced training optimization and performance evaluation in track and field athletes.