| There are many causes of simulation disease for the problem that there will be a loss of direction, nausea and vomiting and other simulation diseases when the simulation participants wear virtual reality helmet in a long time. Among them, Visual delay is one of the most important reasons for the simulation diseases. In this paper, to reduce visual delay produced in the simulation process is regarded as the goal. To establish the precise model of head movement, I start with improving the head movement forecasting precision of angle of view so that three effective prediction algorithms, which are based on CV and CA model Kalman filter head motion prediction algorithm and sEMG head movement time delay compensation algorithm, are proposed and compared. And the related results of the prediction algorithm are obtained.The main contents of the thesis are displayed as follows:(1) The sEMG signal was summarized, and the principle and characteristics of sEMG signal generation were described. The motion characteristics of human head and skeletal muscle were studied in virtual cockpit environment. What’s more, the visual delay was summarized, and the reason of visual delay was described.(2) The head movement experiment was designed and the type of experimental motion was determined. And Collecting 576 groups of EMG data and 432 groups inertial data by EMG and gyroscope.(3) Establishing the CV model and CA model and comparing the prediction results of two algorithms which are based on CV model Kalman filter head motion prediction algorithm and CA model Kalman filter head motion.(4) Designing the experiment of sEMG signal prediction head motion feasibility. Preprocessing sEMG signal and extracting the features of sEMG signal. And then the extracted features were input to a feedforward neural network to be trained. And inputting the trained angular acceleration into Kalman filter to predict as well. Establishing the model of head movement delay compensation which is based on sEMG. Moreover, comparing the prediction results of two algorithms based on CA model Kalman filter head motion prediction algorithm and sEMG head movement time delay compensation algorithm respectively. |
