长期贮存平台惯导系统壳体效应变化行为模型

Heading sensitive drift behavior model for platform inertial navigation system under long-term storage

长期贮存条件下平台惯导系统壳体效应具有与使用状态不同的漂移特性,其漂移规律与各性能参数退化及其相互耦合特性相关,在工程应用中往往难以分析贮存条件下壳体效应稳定性水平和合理配置标定维护资源。本文通过全面分析伺服电路零位和框架轴上干扰力矩引起壳体效应漂移的原理及其漂移表达式,在此基础上深入挖掘了表达式中漂移参数的变化特性,综合给出了伺服电路零位和框架轴上干扰力矩引起壳体效应漂移的变化行为模型,并结合实际贮存环境剖面对其进行了长期漂移特性、加速特性和稳定性分析,分析表明在现有贮存条件下,伺服电路零位和框架轴上干扰力矩引起的壳体效应在X、Y和Z轴的长期漂移特性相近,与实际使用状态的响应特性不同,且无加速特性,具有较好的稳定性水平,从而为合理安排标定维护资源提供了依据。

The heading sensitive drift of platform inertial navigation system varies with the degradation of performance and the coupling characteristics under long-term storage conditions. Such heading sensitive drift is different from those under working conditions,which makes it difficult to analyze the stability for allocating resources for the calibration and maintenance in engineering application. The theory and expression of heading sensitive drift caused by servo loop zero and structure disturbing torque are firstly presented and derived. Secondly,the drift characteristics of influence parameters are analyzed thoroughly,and the integrated behavioral model of heading sensitive drift under servo loop zero and disturbing torque influence is concluded. And then,the long-time drift characteristic,acceleration performance,as well as the stability of heading sensitive drift behavior are analyzed with actual storage condition profile. 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 of inertial platform system.