Method for optimizing grid focusing state of grid ion thruster in real time based on optical monitoring

Abstract

The invention provides a method for optimizing the grid focusing state of a grid ion thruster in real time based on optical monitoring. The method comprises the following steps: obtaining a focusing state equation, and obtaining a thrust control equation according to the target thrust Ttar given by a satellite control system; simultaneously solving the two equations to obtain an ion density ni* which simultaneously meets a thrust control target and an optimal focusing state, and performing closed-loop control on the ion density by taking the ion density ni* as an ion density adjusting target,taking the gas supply flow and the ionization power as controlled variables and taking the ion density ni' monitored by the optical probe as a feedback variable; meanwhile, substituting the real-timeion density ni' monitored by an optical probe into the optimal focusing state equation to obtain the corresponding extraction voltage Ut*, and adjusting the extraction voltage Ut* to realize real-timeadjustment of the focusing state. The scheme of adjusting the focusing state of a thruster can be determined according to the actual working state of the thruster, and it is guaranteed that a grid system can be in the optimal lead-out focusing state all the time in the thrust adjusting process.

Description

technical field [0001] The invention relates to a method for real-time optimization of the grid focus state of a grid ion thruster based on optical monitoring, and belongs to the field of aerospace plasma propulsion. Background technique [0002] As the mainstream plasma propulsion devices, ion thrusters and Hall thrusters have been widely used in the field of space propulsion. With the increasing investment of the country in the field of space science research, the vigorous development of commercial aerospace and the rapid development of the new generation of satellite platforms, the multi-mode requirements of variable thrust and variable specific impulse have been put forward for the plasma propulsion system, and the gravitational wave detection Space science missions such as the measurement of the earth's gravity field and the earth's gravity field put forward the requirement for a large-scale continuous adjustment of the thrust of the propulsion system, which poses a cha...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for real-time optimization of the grid focus state of the grid ion thruster based on optical monitoring, so as to solve the problem that the grid system works in an under-focus or over-focus state, and a large number of extracted ions are intercepted by the grid system. Issues that affect grid system life and thruster efficiency; and issues that reduce the advantages of high specific impulse of electric propulsion systems over other systems while creating hidden dangers for space propulsion missions

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