从吉林一号卫星某空间相机的实际应用角度出发,提出采用基于碳纤维复合材料的高精密薄壁筒和桁架杆作为主、次反射镜间的支撑结构,并完成相关设计和工程分析。深入开展相关振动、静力和温度稳定性试验,分析和试验结果表明,所提的支撑结构具有较好的结构稳定性和抗视轴抖动性能,碳纤维桁架的质量仅为2.11 kg,当基频达到186 Hz时,在重力和4 ℃温升条件下的稳定性优于1″。对在轨获取的全色遥感影像进行动态传函(MTF)分析,结果表明空间相机在轨动态MTF值为0.08,进一步证明CFRP桁架结构支撑技术的可靠性和有效性。

From the perspective of the actual application of a space camera on the JL-1 satellite, this paper proposed to use high-precision thin-walled tubes and truss rods based on carbon fiber reinforced polymer (CFRP) as the support structure between the primary and secondary mirrors. Besides, related design and engineering analysis are completed. Furthermore, relevant vibration, static and temperature stability tests are carried out in depth. The analysis and test results show that the proposed support structure has good structural stability and resistance to the line of sight jitter and the mass of the carbon fiber truss is only 2.11 kg. Additionally, when the fundamental frequency reaches 186 Hz, the stability under gravity and 4 ℃ temperature rise is better than 1″. The dynamic modulation transfer function (MTF) analysis of the panchromatic remote sensing images obtained in orbit shows that the in-orbit dynamic MTF value of the space camera is 0.08, which further proves the reliability and effectiveness of the truss structure support technology based on CFRP.