卫星使用频段的逐渐提高对星载天线反射器的型面精确度提出了越来越高的要求。模具设计和制造是制造高精确度反射器的关键技术之一, 温度对模具的影响主要表现在型面精确度和热膨胀变形。建立了一个偏置抛物反射面天线成型模具的设计补偿公式, 并对该补偿公式进行了理论推导、仿真分析和试验验证。结果表明, 基于该补偿方法, 模具在反射器固化温度下型面精确度达到了0.05 mm均方根(RMS), 能够有效降低模具热变形对反射面天线型面精确度的影响。

With the gradual increasing of utilized satellite bands, the requirement on the surface accuracy of reflectors is growing higher rapidly. The mould design and manufacture is one of the key factors of manufacturing higher accuracy reflectors. The mould properties would be influenced by temperature in the surface deviation of the Root Mean Square(RMS) and the thermal expansion deformation. A mould surface compensation formula of an offset parabolic mould is established. The compensation formula is theoretically derived, simulated and verified. Results show that the mold surface accuracy achieves 0.05 mm RMS at the curing temperature of the reflector by this compensation method; the influence of the mould’s thermal deformation on the antenna surface accuracy can be effectively weakened.