为解决通信卫星真空热试验中有效载荷的部分测试电缆工作温度超出正常区间导致电缆相位特性发生极大跃变的问题,文章设计了一种新型电缆控温方法,实现了测试电缆在真空低温复杂环境下的集中控温.在某新一代通信卫星真空热试验中,应用该集中控温方法后测试电缆网的温度被严格控制在40 ℃±5 ℃,单根电缆沿路径的温度差异被控制在±3 ℃之内,满足了星上有效载荷的时序和相位要求,提高了地面测试的准确性.%In the thermal vacuum test, a large number of cables are connected to the communication satellite through a flange outside the space environmental simulator. A part of the cables would work beyond the normal temperature range, which may lead to undesirable phase jumps. To solve this problem, a new type of cables temperature control device is proposed. With it, the centralized temperature control of the cables in complex vacuum cryogenic environment is realized. In the thermal vacuum test of a new-generation communications satellite, the temperature of the related cables is controlled within a range of 40 ℃±5 ℃, and the temperature difference of a single cable along its path is kept within ±3 ℃. Under the controlled temperature, the requirements of timing and phase of the satellite payload is guaranteed, and therefore the accuracy of the ground testing is also improved.
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