MEO导航卫星热控系统设计及验证

为解决MEO导航卫星整星热控设计以及有特殊温控指标要求设备的温度控制问题，结合卫星构型、轨道姿态、工作模式等特点，采用被动散热、扩热及局部隔热的热控措施，辅以开关或高精度比例控温算法分级主动热控设计原则。针对载荷大功率设备和相控阵天线，采用热管网络结合扩展散热区的热控措施；针对有温度敏感指标要求的蓄电池组、原子钟等采用隔热措施，辅以主动热控进行独立控温设计；热控软件设计采用在轨自主故障诊断及自动隔离设计方法，显著提升热控系统在轨自主运行能力。经过地面整星级热平衡试验验证及优化设计，在轨多颗卫星的飞行数据表明:整星热控方案设计合理，星上各仪器设备温度满足要求，温度设计余量及变化趋势符合预期。 

Thermal Control Design and Validated for MEO Navigation Satellites

In consideration of the configuration design, orbital attitude, and operation mode of the MEO navigation satellite, both passive and active thermal designs including conduction, diffusion, insulation, switch or proportional control and multistage control strategy are used in the satellite thermal system to satisfy the strict temperature requirements. For high-power payloads and phased array antennas, heat pipe networks along with extended radiators are employed; for temperature-sensitive equipment like battery and atomic clock, thermal insulation along with active control are applied. On-orbit fault diagnosis and automatic isolation designs are utilized in the thermal control software to improve the on-orbit autonomous operation capability. The satellite thermal design is validated by the ground thermal balance test and the performance of satellites in orbit. Validation results illustrate that on-board equipment satisfies temperature requirements, and the design margin and temperature trend lines well with expectation.