On-orbit calibration method for satellite cold air propulsion system flow sensor

Abstract

The invention relates to an in-orbit calibration method for a satellite cold air propulsion system flow sensor. The in-orbit calibration method comprises the following steps: S1, electrifying and preheating the flow sensor and a pressure sensor in the satellite cold air propulsion system and starting the temperature control of the propulsion system; S2, determining the zero position of the flow sensor according to the output of the flow sensor under the no-flow working condition of the propulsion system, and completing zero position calibration; S3, using an attitude control thruster in the satellite cold air propulsion system for sending air injection pulses, generating a standard pressure wave signal, and collecting a flow wave signal actually outputted by a flow sensor; S4, calculatinga theoretical flow value of the flow sensor through inversion according to the standard pressure wave signal; and S5, taking the calculated theoretical flow value as a reference, comparing the actualoutput value of the flow sensor, calibrating the flow sensor to obtain a conversion coefficient calibration value, and completing on-orbit calibration of the flow sensor by utilizing the conversion coefficient calibration value.

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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