摘要
大动态、高精度主动热控技术是高轨大型空间相机高性能、长寿命运行的核心关键。空间相机主动热控系统既要满足高精度测控温要求,又要实现小型化、集成化以降低资源和功耗需求。然而,传统以中央处理器(CPU)和数字信号处理器(DSP)为控制单元的架构难以满足高集成化的设计需要,且热控功率较大,需进行功率管理以满足整星能源要求。针对以上问题,面向地球同步轨道大型空间相机大动态、高精度的测控温需求,设计了以现场可编程门阵列(FPGA)为核心控制单元的主动热控系统,利用FPGA的高速并行处理能力和丰富接口资源,实现复杂空间相机高集成度高精度主动热控。设计了热控功率错峰功能,对加热片采用分时控制,动态实时检测热控功率,在保障相机关键部件控温精度的前提下,将热控功率限定在功率设定值。该系统已应用于地球同步轨道大型空间相机,对相机108路加热、138路测温和2个星上黑体进行高精度测控温,通过地面和在轨测试验证了主动热控系统设计的合理性和正确性。
Objective The complex space camera in geostationary orbit experiences significant changes in external thermal flux,leading to large temperature variations within the camera.The thermal stability and uniformity of optical components directly affect the imaging quality,thus requiring a large amount of high-precision active thermal control to provide the optimal operating temperature conditions for the camera.Geostationary satellites have multiple functions and limited resources,so the design of the active thermal control system for large space cameras must satisfy high-precision temperature control requirements while also being integrated to meet constraints on weight and power consumption.However,the traditional architecture using central processing unit(CPU)and digital signal processor(DSP)as control units is not well-suited for high integration design requirements,and the high thermal control power requires power management to meet the energy requirements of the entire satellite.Methods This article analyzes the characteristics,difficulties,and index requirements of thermal design for large geosynchronous orbit cameras,and proposes an integrated electronic active thermal control scheme with field programmable gate array(FPGA)as the core control unit.By utilizing the high-speed parallel processing capability and rich interface resources of FPGA,the scheme achieves high integration and high precision active thermal control for complex space cameras.To meet the requirements of large dynamic range temperature measurement,the measurement error is quantitatively analyzed,and a polynomial correction method based on least squares is proposed to correct the temperature measurement error within a large dynamic range.To address the problem of multiple heating circuits and high temperature control accuracy,a differentiated temperature control strategy is designed,which combines highspeed open-loop temperature control and fuzzy incremental proportion-integration-differentiation(PID)temperature control.This enables the 108 ma
作者
黑花阁
李潇雁
李璐芳
蔡萍
谢荣建
陈凡胜
Hei Huage;Li Xiaoyan;Li Lufang;Cai Ping;Xie Rongjian;Chen Fansheng(Key Laboratory of Intelligent Infrared Perception,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;University of Chinese Academy of Sciences,Beijing 100049,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,Zhejiang,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2023年第22期147-156,共10页
Chinese Journal of Lasers
基金
国家自然科学基金(61975222)。
关键词
成像系统
相机
主动热控
高精度测控温
热控功率错峰
地球同步轨道
imaging systems
camera
active thermal control
high-precision temperature measurement and control
thermal control power off-peak
geosynchronous orbit
