An on-orbit calibration method for the flow sensor of the satellite cold air propulsion system

Abstract

The present invention relates to an on-orbit calibration method for a flow sensor of a satellite cold air propulsion system, S1, preheating the flow sensor and pressure sensor in the satellite cold air propulsion system and turning on the temperature control of the propulsion system; S2, according to the propulsion The output of the flow sensor under the condition of no flow in the system determines the zero position of the flow sensor and completes the zero calibration; S3. Use the attitude control thruster in the satellite cold air propulsion system to send jet pulses, generate standard pressure wave signals, and collect the flow sensor The actual output flow wave signal; S4. According to the standard pressure wave signal, the theoretical flow value of the flow sensor is calculated by inversion; S5. Taking the calculated theoretical flow value as a reference, comparing the actual output value of the flow sensor, the flow sensor Carry out calibration to obtain the conversion coefficient calibration value, and use the conversion coefficient calibration value to complete the on-orbit calibration of the flow sensor.

Description

technical field [0001] The invention relates to an on-orbit calibration method for a flow sensor used in a satellite cold air propulsion system, which can evaluate and correct the deviation of the output value of the flow sensor on the satellite under actual space flight conditions, and belongs to the technical field of spacecraft propulsion system design and application. Background technique [0002] The flow sensor is one of the key components of the high precision variable thrust cold air propulsion system. Wide-range regulation of thrust in propulsion systems relies on accurate feedback from high-precision flow sensors. The calibration of the high-precision flow sensor is mainly based on the test measurement based on the flow calibration equipment on the ground. However, due to the difference between the on-orbit space environment and the ground test environment, as well as the slow release of the internal stress of the product itself during the long-term operation on t...

AI Technical Summary

Problems solved by technology

Due to the fact that it is impossible for the satellite to connect to a standard flowmeter to calibrate the flow sensor on the star under the actual flight conditions in space, that is, there is no standard source of flow in orbit, so the calibration of the conversion coefficient of the flow sensor has always been a difficult problem

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