【摘要】 航天器的内带电效应是影响其在轨稳定运行的重要因素。内带电效应的电流监测可以直接获得一手的内带电效应监测数据,也可获得反映引起内带电效应的高能电子充电环境的状态。针对近地中高地球轨道环境,基于国外电流监测数据并考虑可能遭遇的高能电子暴环境,分析获得了内带电效应电流的测量范围10 fA～500 pA。针对未来中高轨及木星、火星等深空探测任务内带电监测需求,提出了一种微弱电流监测方案,实现了pA级微弱电流测量模块的实验室模拟标定。标定结果表明,在10 fA～500 pA范围内,输入电流与输出测量电压之间的线性度较好。更多还原

【Abstract】 Internal charging effect is one of the main factors affecting on-orbit performance of spacecraft.Current measurement can directly obtain the firsthand data of the internal charging effect. It also can obtain electron environment status through current measurement. Based on the existing current data and the possible exposure of energetic electron storm,the current of the internal charging effect is 10 fA—500 pA on the medium and high earth orbits. For the requirement of the current monitoring for the future earth orbit,the Jupiter and Mars exploring mission,a pico current measurement method has been proposed. A pico current monitor unit has been developed and calibrated in the laboratory. The calibration results have shown that the linearity between input current and output voltage is good from 10 fA to 500 pA.更多还原