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针对被动型星载氢钟气体电离装置低功耗、低电磁干扰的设计要求,设计了一种基于平面盘绕馈能天线的H型电离系统,并建立该电离方法的数学模型。首先,由Maxwell方程出发,推导出了电离泡中的电场和磁场的分布模型,得到气体电离机制;再由电磁场的分布方程推导出氢气击穿判据表达式,建立了气体电离条件的数学模型;最后,利用电离击穿条件判据方程优化了电离装置的设计参数。数值仿真与测试表明该模型是有效的,采用优化的设计参数可以使电离功耗和电磁干扰特性得到改善,且电离直流电源总功率可小于2W。
Aiming at the design requirements of low power consumption and low electromagnetic interference of passive spaceborne hydrogen ion gas ionization device, an H type ionization system based on planar wound feed-in antenna is designed and a mathematical model of the ionization method is established. First, Maxwell’s equation is used to derive the distribution model of the electric and magnetic fields in the ionization bubble, and the gas ionization mechanism is obtained. The expression of hydrogen breakdown criterion is derived from the distribution equation of the electromagnetic field, and the mathematical model of gas ionization condition is established Finally, the design parameters of the ionization device are optimized by using the equation of ionospheric breakdown criterion. Numerical simulation and test show that the model is effective. With the optimized design parameters, the ionization power consumption and electromagnetic interference can be improved, and the total power of ionized DC power supply can be less than 2W.