CAJ | 학술논문

航天器在轨运行过程中，由于内部多种活动部件的存在，会使其结构体产生振幅较小、频率较高的微小角振动，这会影响航天器有效载荷的正常工作。光纤陀螺作为航天器的姿态测量部件，在设计原理上具有高带宽的特点，针对航天器微小角振动的特点，提出采用光纤陀螺测量该振动信息，同时提出采用经验模态分解的方法将光纤陀螺输出信号分解成各个时间尺度上的本征模态函数，再经过 Hilbert 谱分析方法检测出微小角振动信息。通过星载测试试验对该方法进行了有效性验证，结果表明：采用经验模态分解技术能够实现航天器微小角振动信号的检测，为航天器微小角振动的高精度测量提供了新手段和新方法。
항천기재궤운행과정중，유우내부다충활동부건적존재，회사기결구체산생진폭교소、빈솔교고적미소각진동，저회영향항천기유효재하적정상공작。광섬타라작위항천기적자태측량부건，재설계원리상구유고대관적특점，침대항천기미소각진동적특점，제출채용광섬타라측량해진동신식，동시제출채용경험모태분해적방법장광섬타라수출신호분해성각개시간척도상적본정모태함수，재경과 Hilbert 보분석방법검측출미소각진동신식。통과성재측시시험대해방법진행료유효성험증，결과표명：채용경험모태분해기술능구실현항천기미소각진동신호적검측，위항천기미소각진동적고정도측량제공료신수단화신방법。
Due to the existing of various moving parts, the smaller amplitude and lower frequency will appear in the structure of spacecraft, when a spacecraft moving in orbit. This phenomenon will affect the inner payload. As an attitude measurement equipment of spacecraft, FOG obtains the characteristics of high bandwidth. Thus it was put forward that FOG can be adopted to measure the micro vibration. Moreover, EMD was adopted to decompose the output signal of FOG to intrinsic mode function on time scale as well. After that, Hilbert analysis method will be used to detect available micro vibration information. This method was tested in the spacecraft examination. The result shows that empirical mode decomposition technique could realize spacecraft′s micro vibration, which brings a new method for the field of micro vibration measurement of spacecraft.