被动型星载氢钟H型气体电离模型及参数优化

H-Mode Gas Ionization Model for Passive Spaceborne Hydrogen Maser and Parameters Optimization

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。

An H-mode ionization system was designed for the requirements of low power consumption and low electromagnetic interference of the passive spaceborne hydrogen maser, which adopting a planar rolled coil antenna to supply power. And a mathematic model of ionization was built. Firstly, the distribution model of electromagnetic field in the ionization bubble and the ionization mechanism of the certain method were deduced from the Maxwell equations. And then, the ionization puncture condition criterion and its mathematic model were acquired. Finally, parameters of ionization device were optimized by the criterion equation. Both simulation and measurement show that the ionization model is effective, and the optimized design parameters have improved electromagnetic interference, and the total DC the performance of power consumption and power can be less than 2W.