摘要
针对多板式合成孔径雷达天线展开机构中由于多误差耦合传递导致的装配精度控制难题,文章提出一种模块化误差处理方法。首先依据串并联机构原理将复杂天线展开机构分解为铰链、杆件及面板功能模块,基于闭环矢量原理建立各模块的装配误差参数化模型;然后通过线性叠加各模块的误差传递函数,构建天线板位姿误差与几何公差等误差源的完整映射关系,实现超静定杆系结构的几何精度预测;最后采用偏微分法量化各误差源对装配精度的灵敏度系数,并对22 m×3 m的天线开展了装调试验。结果表明,使用该方法可快速优化天线指向精度至0.012°以下。该方法为SAR天线的数字化装调与公差优化提供了理论工具,其应用可有效提升在轨展开精度与成像性能。
To address the challenge of controlling assembly accuracy due to the coupled transmission of multiple errors in multi-panel synthetic aperture radar(SAR)antenna deployment mechanisms,a modular error modeling approach was proposed.The complex deployment structure was decomposed into functional modules—hinges,rods,and panels—based on series-parallel mechanism principles.Parametric assembly error models for each module were established using the closed-loop vector method.By linearly superimposing the error-transfer functions of the modules,the pose errors of the antenna panels were mapped to global geometrictolerance sources,enabling the prediction of geometric accuracy in statically indeterminate rod systems.Partial differential methods were further employed to quantify the sensitivity coefficients of individual error sources.Assembly and adjustment tests on a 22 m×3 m antenna yielded a pointing accuracy better than 0.012°.The results demonstrate that the method provides a systematic theoretical tool for the digital assembly,adjustment,and tolerance optimization of SAR antennas,effectively enhancing on-orbit deployment accuracy and imaging performance.
作者
余精汉
侯鹏
马海龙
刘俊杰
YU Jinghan;HOU Peng;MA Hailong;LIU Junjie(Shanghai Institute of Satellite Equipment;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处
《航天器环境工程》
2025年第6期650-659,共10页
Spacecraft Environment Engineering
基金
国防基础科学研究计划项目。
关键词
SAR天线机构
串并联耦合
闭环矢量法
装配误差建模
灵敏度分析
SAR antenna mechanism
series-parallel coupling
closed-loop vector method
assembly error modeling
sensitivity analysis
