物理学报2025，Vol.74Issue(8)：10-21,12.DOI:10.7498/aps.74.20241376
空间引力波探测太极计划惯性传感器标度因数与质心偏差的在轨定标方案设计
Design of in-orbit calibration scheme for scale factor and center-of-mass deviation of inertial sensor of Taiji program for space gravitational wave detection
摘要
Abstract
The Taiji program-frequency gravitational waves.The mission's success hinges on the precise operation of its core payloads,particularly the inertial sensors,which are responsible for measuring the residual acceleration noise of the test masses.The duration of a space-based gravitational wave detection mission is 3 to 5 years.During this period,the shift in the satellite's center of mass due to propellant consumption and other factors,as well as the drift in the scale factors caused by electronic component aging,will gradually degrade the accuracy of inertial sensor data.Therefore,it is necessary to regularly perform in-orbit calibration of inertial sensor parameters. In this work,we develop a calibration scheme,which actively applies controlled satellite oscillations and is tailored according to the installation layout of the inertial sensors in the Taiji program and the noise models.For the calibration of scale factors,high-precision star sensors are used to measure the satellite attitude signal,which is then combined with the driving voltage data from inertial sensors.By using the linear relationship between these signals,the scale factors are estimated using an extended Kalman Filter.For the calibration of center of mass(CoM)offsets,the calibrated scale factors are utilized,along with the driving voltage data from the front-end electronics of inertial sensors,to derive the test mass's angular acceleration,linear acceleration,and angular velocity.These parameters are then used to complete the CoM offset calibration according to the dynamic equation. The feasibility of the proposed calibration scheme is validated through a simulation experiment.The results demonstrate that the scale factors of the three axes can be calibrated to relative accuracies of 33×10-6 and 173×10-6,respectively,meeting the requirement within 300×10-6.The CoM deviation are calibrated with accuracies of δr1=[15 μm,31 μm,34 μm],δr2=[5 μm,15 μm,13 μm],satisfying the 75 μm threshold.These results confirm that the proposed scheme can effectively maintain the inertial sensors'performance within the required accuracy range. All in all,the calibration scheme developed in this study is crucial for maintaining the high performance of inertial sensors in the Taiji program.By achieving the precise calibration of the scale factors and deviation of center of mass within the required accuracy ranges,the scheme ensures the reliability of inertial sensor data,thereby significantly enhancing the sensitivity of space-based gravitational wave detection,which paves the way for groundbreaking discoveries in astrophysics and cosmology.关键词
惯性传感器/在轨定标/标度因数/质心偏差Key words
inertial sensor/in-orbit calibration/scale factor/center of mass offset引用本文复制引用
刘畅,魏晓通,张昊越,邓琼,梁博,强丽娥,徐鹏,齐克奇,王少鑫..空间引力波探测太极计划惯性传感器标度因数与质心偏差的在轨定标方案设计[J].物理学报,2025,74(8):10-21,12.基金项目
国家重点研发计划(批准号:2020YFC2200603,2020YFC2200601,2020YFC2200602,2021YFC2201901)、国家自然科学基金青年科学基金(批准号:11905017)和中国科学院战略性先导科技专项(批准号:XDA15020700,XDA15018000)资助的课题. Project supported by the National Key R&D Program of China(Grant Nos.2020YFC2200603,2020YFC2200601,2020YFC2200602,2021YFC2201901),the National Natural Science Foundation for Young Scientists of China(Grant No.11905017),and the Strategic Priority Science and Technology Project of the Chinese Academy of Sciences(Grant Nos.XDA15020700,XDA15018000). （批准号:2020YFC2200603,2020YFC2200601,2020YFC2200602,2021YFC2201901）
