星载平板有源SAR天线热设计与验证  

Thermal Design and Verification of Spaceborne Panel SAR Antenna

作　　者：张传强 孟恒辉[1] 耿利寅[1] 殷亚州 

机构地区：[1]北京空间飞行器总体设计部空间热控技术北京市重点实验室,北京100094

出　　处：《航天器工程》2017年第6期99-105,共7页Spacecraft Engineering

基　　金：国家重大科技专项工程

摘　　要：合成孔径雷达天线是微波遥感卫星的重要载荷之一,一般具有尺寸大、收发单元多、热耗大、工作模式多等特点。载荷热耗峰值可达7000W,同时为减小热变形对指向精度的影响,设备温度一致性需优于10℃。因此大功率组件散热和温度一致性保持是合成孔径雷达天线热控的主要难题。采用被动和主动相结合的热控手段,合理设计散热通道,解决设备的散热难题;采用等温化设计,布置热管网络,降低设备间温差;采用新型智能随动控温方法,解决不同工作模式切换、空间外热流变化、辐射耦合带来的温度梯度保持难题。采用Thermal Desktop软件对天线进行了热仿真分析,并进行了热平衡试验。分析、试验结果和在轨测试结果表明温度和温差均满足要求。该设计方法可为大功率有源合成孔径雷达天线热设计提供借鉴。Synthetic aperture radar （SAR）is a kind of payload for microwave remote sensing spacecraft,with characteristics of huge scale,multi modes,numerous transceiver modules,and large heat dissipation.Peak heat dissipation can reach 7000 watts.In order to reduce thermal de-formation influence to pointing accuracy,temperature consistency is required to be less than 10℃.Active and passive thermal control method is used to solve the key thermal design difficul-ties such as heat dissipation temperature consisteney.Heat dissipation is solved by choosing rea-sonable heat transfer channel.Isothermal heat pipe network is arranged to reduce temperature difference among devices.A new intelligent temperature track control strategy is used to reduce temperature gradient caused by modes switching,out-flux variation and radiation couple.Nume-rical analysis using Thermal Desktop software and thermal balance test are accomplished.It is proves that the temperature level and difference can meet the requirements.This design method can provide guidance for thermal design of large-power SAR antenna.

关 键 词：SAR天线 热设计 试验验证 

分 类 号：V443.4[航空宇航科学与技术—飞行器设计]