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As one of the key technologies of the future development of the Internet, Virtual reality technique is more and more used in the field of Physical Education. Its appearance will subvert traditional sport sports teaching mode and education thinking, and brings a series of major changes for sports education. As for the limitations of modern sports teaching mode, this article is to analyze how virtual reality technique apply to physical education, and build a new sports teaching mode based on virtual reality technique and provide a more scientific, systematic theoretical reference for improving the quality of teaching and optimizing teaching methods with the combination of situational cognitive theory.

The output signal of the free-drive three-axis MEMS gyroscope used in Spinning Projectiles contains rolling is sine period signal. In order to demodulate the yawing and pitching angular rates, extracting the fringe phase information is needed. It is difficult to realize the phase demodulation of single signal. To solve this problem, reference signal is provided. The phase of the gyroscope is extracted by computing the phase difference. Then, three methods of phase difference measurement are introduced and simulated by MATLAB. According to the signal feature, the contrastive analysis of measurement error is made and the maximal precision of measuring method for phase difference is obtained. The last part is the analysis of performance.

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