Research on Heading Sensitive Drift Behavior of Inertial Platform System under Long-term Storage Condition

Huang Xiakai,Chen Yunxia

doi:10.4172/2168-9792.1000101

Abstract

The heading sensitive drift of inertial platform system changes with the degradation of components’ performance and the coupling characteristics under long-term storage conditions. Such heading sensitive drift is different from the drift under working conditions, and it is difficult to analyze its stability for allocating resources for the calibration and maintenance in engineering application. In this paper, firstly the theory and expression of heading sensitive drift caused by servo loop zero and structure disturbing torque was presented and derived. Secondly, the drift characteristic of influence parameters was analyzed thoroughly based on the expression, and the integrated behavioral model of heading sensitive drift under servo loop zero and disturbing torque influence was concluded. And then, the long-time drift characteristic, acceleration performance and stability of heading sensitive drift behavior were analyzed with actual storage condition profile. The results indicate that heading sensitive drift on the X, Y and Z axis has the similar long-term drift characteristics without acceleration response, which is different from the response characteristic in actual use and therefore has great significance for allocating resources for the calibration and maintenance in inertial platform system.

Highlights

Heading sensitive drift mainly refers to the phenomenon of output of Gyro drifts along with the heading altitude change of inertial platform system, and its value is more than ten times or even scores of times of Gyro precision level with unpredictable drift status, which is a difficult issue for the research of inertial platform system precision nowadays [1,2,3].The influence mechanism of heading sensitive drift is complicated and inter-correlated, and its influencing factors are generally summed up into the following four: servo loop zero and structure disturbing torque, vibration, temperature and magnetic influence
The results indicate that heading sensitive drift on the X, Y and Z axis has the similar long-term drift characteristics without acceleration response, which is different from the response characteristic in actual use and has great significance for allocating resources for the calibration and maintenance in inertial platform system
Under the long-term storage conditions, servo loop zero and structure disturbing torque of inertial platform system in Figure 1 will change with the materials creep or heading altitude angle drift, which makes the gyros output additional angle related to the heading altitude angle drift [12]

Summary

Introduction

Heading sensitive drift mainly refers to the phenomenon of output of Gyro drifts along with the heading altitude change of inertial platform system, and its value is more than ten times or even scores of times of Gyro precision level with unpredictable drift status, which is a difficult issue for the research of inertial platform system precision nowadays [1,2,3]. The influence mechanism of heading sensitive drift is complicated and inter-correlated, and its influencing factors are generally summed up into the following four: servo loop zero and structure disturbing torque, vibration, temperature and magnetic influence. Under the long-term storage conditions, servo loop zero and structure disturbing torque of inertial platform system in Figure 1 will change with the materials creep or heading altitude angle drift, which makes the gyros output additional angle related to the heading altitude angle drift [12]. The detailed block diagram of the rolling ring and pitch ring’s servo loops of vertical gyros is shown, and the detailed block diagram of the servo loop and its self-locking loop of traverse gyro is shown in Figure 3 [6,7,13]

JrS x φ Cey y

Conclusion