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Signal Extraction and Data Processing in the Testing and Guiding System for Freestyle Skiing Aerials

Author: LiuYanHua
Tutor: YangWeiPing；GeYunJian
School: Jiangxi Agricultural University,
Course: Agricultural Electrification and Automation
Keywords: Freestyle skiing aerials Human motion information Signal extraction Data processing Testing and guiding system
CLC: TN911.7
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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Abstract


The detection of human motion information is a current hot topic in sports research in order to understand human movement patterns more accurately and improve athletic performance. With the rapid development of computer technology, high-speed photography technology, sensor technology and so on, many human motion information acquisition instruments are applied in physical training, which are playing a more and more important role in improving the athletic performance.Freestyle skiing aerials is one of the high-risk and skill-demanding snow sports, in which any technical flaw of athletes may lead to the failure of the jump, even leading to injuries or fatalities. Despite our country’s recent breakthroughs in this sport, the understanding of the rules and characteristics of the sport needs further improvements due to our late entry. Currently, our analysis and research in the sport mainly take the form of the foreign video analysis system that records the instant movements of athletes, and analyzes the captured images based on biomechanics theory, so as to analyze and guide the athletes’movements. This system, however, has several shortcomings such as the high level of the complication of the analysis process, long process time, high equipment cost, etc., which made the improvement of athletic performance costly and ineffective.In this paper we build the testing and guiding system based on the features of the freestyle skiing aerials and combined with the knowledge of sports biomechanics, advanced sensing technology, information acquisition, and ergonomics. It overcomes several shortcomings of the current video analysis system. The main contents are as follows:1. A biomechanical information acquisition method is proposed, which can obtain acceleration, angular velocity and some other parameters, in addition, a prototype of testing and guiding system used for freestyle skiing aerials has been built.2. The system can capture the kinematic parameters of the athletes accurately. Subsequently the data can be processed so as to obtain more accurate position and orientation information of athletes. The final data can be displayed in the form of two-dimensional curves together with the video captured by the camera in the system to aiding the analysis.3. The prototype has been tested by professional athletes, and the results of the experiments showed that this system is capable of obtaining accurate data in real time, as well as extracting the key attitude features of the movement from the data, which proved the reliability and applicability of the system.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Signal processing
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