A mn-level thrust continuously adjustable electric propulsion system and method based on hemp thruster

Abstract

The invention relates to an mN stage thrust-continuously-adjustable electric propulsion system and method based on an HEMPT thruster. The system comprises the HEMPT thruster, an electric propulsion control unit, a proportional flow storage and supply unit and a digitization adjustment power unit; the electric propulsion control unit is controlled under on-star control commands to generate two drive control signals, the first drive control signal is sent to the proportional flow storage and supply unit, and the second drive control signal is sent to the digitization adjustment power unit; meanwhile, the electric propulsion control unit collects a first telemetry signal fed back by the proportional flow storage and supply unit and a second telemetry signal fed back by the digitization adjustment power unit, and a telemetry package is formed to be sent to an external on-star computer; and the thruster generates mN stage thrust-continuously-adjustable thrust. The system has the beneficial effects of being simple, reliable, small in weight, low in working voltage, wide in thrust adjusting scope and the like. By means of the design of the system, continuous adjustment of the thrust can be achieved, the thrust adjusting scope reaches 1 mN to 20 mN, and the thrust resolution ratio is superior to 15 muN.

Description

technical field [0001] The invention relates to a mN-level thrust continuously adjustable electric propulsion system and method based on a HEMPT thruster, which belongs to the technical field of spacecraft propulsion and is mainly used in dragless control of spacecraft. Background technique [0002] High-precision drag-free control technology is currently mainly used in scientific tasks such as gravitational wave detection and high-precision measurement of gravity field. From the perspective of payload measurement accuracy and control accuracy requirements, it belongs to the current space mission with the highest precision requirements and the most complex control indicators. The so-called no-drag control technology uses a combination of inertial detection and micro-thrust control to apply continuous thrust to the spacecraft to "offset" the effects of non-conservative forces such as the atmosphere or solar light pressure. High-precision measuring instruments (such as gravity...

AI Technical Summary

Problems solved by technology

[0004] At present, the electric propulsion system widely used in spacecraft at home and abroad is mainly based on the fixed thrust electric propulsion system, whose thrust remains basically unchanged or has two to three thrust operating points, which cannot meet the requirements of dragless control for continuous adjustment of thrust

At present, the mN-level variable thrust electric propulsion system adopted by foreign drag-free control spacecraft is based on the Kaufmann type xenon ion thruster, which has complex structure, heavy weight and high working voltage.

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