Abstract
The heading sensitive drift of inertial platform system changes along with the degradation of components’ performance and the coupling characteristics under long-term storage conditions. Such heading sensitive drift is different from the drift during operation. It is also difficult to analyze its drift behavior for the model-based PHM system designing of inertial platform systems in engineering application. While the heading sensitive drift is influenced by various factors, this paper aims at dealing with part of this problem from one of the factors, i.e. magnetic field influence. This paper at the beginning derived the principle and the expression of the heading sensitive drift caused by magnetic field. And then, various drift parameters in such expressions were discussed, and the behavioral model of the heading sensitive drift influenced by the magnetic feature of components (such as the sensor, the torquer and the gyrorotor) was obtained. Finally, the long-term drift feature, the acceleration feature and the storage stability of the heading sensitive drift behavior were analyzed with the actual storage profile. The results of this paper indicate that although the heading sensitive drift caused by magnetic field has acceleration feature, the stability is able to meet the accuracy requirement of the inertial platform system under the current storage conditions. The drift value is so small that it can be ignored under the storage conditions. This study has great significance to the model-based PHM system design of inertial platform systems, which aims at improving the inertial platform systems parameters stability.
