Abstract
Due to the fact that attitude error of vehicles has an intense trend of divergence when vehicles undergo worsening coning environment, in this paper, the model of dynamic coning environment is derived firstly. Then, through investigation of the effect on Euler attitude algorithm for the equivalency of traditional attitude algorithm, it is found that attitude error is actually the roll angle error including drifting error and oscillating error, which is induced directly by dynamic coning environment and further affects the pitch angle and yaw angle through transferring. Based on definition of the cone frame and cone attitude, a cone algorithm is proposed by rotation relationship to calculate cone attitude, and the relationship between cone attitude and Euler attitude of spinning vehicle is established. Through numerical simulations with different conditions of dynamic coning environment, it is shown that the induced error of Euler attitude fluctuates by the variation of precession and nutation, especially by that of nutation, and the oscillating frequency of roll angle error is twice that of pitch angle error and yaw angle error. In addition, the rotation angle is more competent to describe the spinning process of vehicles under coning environment than Euler angle gamma, and the real pitch angle and yaw angle are calculated finally.
Highlights
Attitude algorithm is a key part of navigation technology and guarantees directly control system accuracy and navigation accuracy of aircrafts, ships, and vehicles
Synthesizing and analyzing research achievements above, we find that the recognized coning error and the pseudoconing error are generated directly while calculating rotation vector increment from gyro in rotation vector update cycle, and the optimization of attitude algorithm is mainly achieved by using the total model and the simplified model of the classical coning environment to restrain drifting component of coning error
Through investigation of the effect on Euler attitude algorithm for the equivalency of traditional attitude algorithm, we find that attitude error is the roll angle error including drifting error and oscillating error, which is induced directly by dynamic coning environment and further affects the pitch angle and yaw angle through transferring
Summary
Attitude algorithm is a key part of navigation technology and guarantees directly control system accuracy and navigation accuracy of aircrafts, ships, and vehicles. The crucial coning correction of noncommutativity, calculated from gyro data in a separate algorithm, is the critical process executed in rotation vector update cycle to improve the attitude accuracy, and it has attracted more attentions from demanding researchers in navigation technology. This is because the coning error induced by coning environment can affect navigation accuracy and control precision of vehicles [4, 5].
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