摘要
针对航天器长期处于辐照、冷热交变等恶劣环境下,内部、外部结构产生疲劳、屈曲等威胁航天器安全等因素,提出多通道分布式航天器舱体健康数据采集方案。该方案能够实时将舱体强度、力、热等飞行参数采集、存储及分时下传。采用FPGA+数字信号处理器(DSP)架构设计多通道、高精度数据采集系统,通过"调零"及"差分电桥"技术消除远距离线损阻抗及压降,并通过多级选通开关高速轮询采集变化的模拟信号。测试结果表明:电阻信号采集精度高于5‰,微弱电压信号采集精度高于2‰,可应用于航天器的实时健康监测与状态评估。
A multi-channel and distributed spacecraft health data acquisition scheme is proposed in view of the factors that threaten the safety of spacecraft, such as fatigue and buckling of internal and external structures under the harsh environment of radiation as well as hot and cold alternation for a long time. This scheme can collect and store the information of flight parameters, such as cabin strength, force and heat parameters, in real-time or time-sharing mode. The data acquisition system is based on FPGA+DSP architecture with the characteristics of multi-channel and high precision. Self-adaption zero level and differential bridge circuit technologies are adopted to eliminate the long distance off-line loss impedance and voltage drop. And analog signals are acquired by high-speed polling through multilevel gating switch. The test results show that the accuracy of resistance signal acquisition is better than 5‰, and the accuracy of weak voltage signal acquisition is better than 2‰. The scheme can be applied in real-time health monitoring and status assessment of spacecraft.
作者
姜宇鹏
刘中伟
刘敏时
郭晓华
姜连祥
JIANG Yupeng;LIU Zhongwei;LIU Minshi;GUO Xiaohua;JIANG Lianxiang(Shandong Institute of Space Electronic Technology,Yantai,Shandong 264670,China;Shandong Technology and Business University,Yantai,Shandong 264005,China)
出处
《航天器工程》
CSCD
北大核心
2020年第4期52-58,共7页
Spacecraft Engineering
基金
国家自然科学基金(61501281)。
关键词
航天器舱体健康数据采集
多通道
压力信号
微弱电压
频率信号
spacecraft cabin health data acquisition
multi-channel
pressure signal
weak voltage
frequency signal
