摘要
空间电场探测仪是"张衡一号"卫星的主要载荷之一,是进行空间等离子体环境电场探测的仪器。在产品研制中,发现电场探测仪的信号处理单元ULF频段(DC^16Hz)输出电压信号存在温漂问题。在调研温漂问题的解决方法后,文章提出一种不影响产品研制的后期数据处理方法。该方法主要利用信号处理单元在温度试验中所获取的ULF频段输出电压信号以及温度数据作为修正的基础。为找到效果较好的拟合曲线,该方法针对其中台阶化的温度数据进行了Savitzky-Golay算法的平滑处理;对ULF频段输出信号和温度信号采样率不一致以及相较于温度信号的时间滞后问题,分别采用多点平均及相关系数作为判据,寻找滞后时间方法;最后,拟合了ULF频段输出电压信号随温度变化的曲线。用该方法得到的拟合曲线可以在地面为卫星在轨运行时电场探测仪ULF频段电场数据的温度修正提供依据,可以对其他空间科学类探测载荷的温漂问题起到借鉴作用。
Space Electric Field Detector is one of the main payloads on ZhangHeng-1. Its objective is to measure the space electric field in the plasma environment. During the development of the product, there is temperature drift problem between the output potential of ULF(DC^16 Hz)frequency band from the signal process module and the module itself temperature variation. This paper proposes a data post-processing method without affect the development after some research on the solutions of temperature drift problems. By using the output voltage signals and the temperature data from the temperature tests of the signal process module as the basic of the correction, the method using Savitzky-Golay method to smooth the temperature data which was step-like originally, and using multi-point average method and correlation coefficient as the criterion to find the delayed time to solve the inconsistency sample rate and time delay problems between the temperature data and the potential data, finally the fitted curve of 2 nd polynomial is received. This method can provide the evidence to correct the ULF band output potential data with the temperature drift problem during the satellite on orbit, and also has the reference value to other science detection payloads.
作者
李诚
雷军刚
李世勋
宗朝
刘泽
LI Cheng;LEI Jungang;LI Shixun;ZONG Chao;LIU Ze(Lanzhou Institute of Physics,Lan Zhou 730000,China)
出处
《空间电子技术》
2019年第4期89-93,共5页
Space Electronic Technology
关键词
电场探测仪
地面数据处理
温漂修正
Electric field detector
On-ground data process
Temperature drift
