A Propellant Remaining Measurement Method Based on Multi-source Data Fusion

Abstract

This paper discloses a method for measuring the remaining amount of propellant based on multi-source data fusion. The method includes: during the orbit change, from the pressure and temperature telemetry parameters of the propulsion system, the BK method and the PVT method are used to separately calculate the real-time propellant consumption estimate value; through the historical data, the current time BK method is obtained by the time domain estimation method The variance data corresponding to the PVT method; according to the least squares method, the weighting coefficients of the BK method and the PVT method are obtained from the estimated variance, and the current optimal estimate of propellant consumption is calculated; subtracted from the propellant mass before orbit change The optimal estimated value of consumption is obtained to obtain the remaining amount of propellant at the current moment. The invention realizes the real-time data fusion of various methods for measuring the remaining amount of propellant, and improves the measuring accuracy of the remaining amount of propellant.

Description

technical field [0001] The invention relates to a technology for measuring the remaining amount of propellant of a spacecraft, in particular to a method for measuring the remaining amount of propellant based on multi-source data fusion. Background technique [0002] With the development of spacecraft technology, especially the use of long-lived satellites, higher and higher requirements are placed on the level of on-orbit management during the life of the spacecraft. For satellites in geostationary orbit, the amount of propellant carried is the main factor restricting the life of the satellite, and propellant prediction will also affect the off-orbit operation of the satellite. An important task of management. [0003] For the orbit transfer phase, the commonly used propellant remaining measurement methods for satellites include BK (book-keeping) method, PVT (pressure, volume, temperature) method, ultrasonic flowmeter method, etc. The PVT method and the BK method are the e...

AI Technical Summary

Problems solved by technology

Among them, the measurement uncertainty of the PVT method is relatively large, and the measurement accuracy of the BK method is relatively high, but it relies on the integral method, so there is a cumulative error

Obviously, using a single calculation method is lacking in long-term measurement accuracy

In practical applications, the method with the highest measurement accuracy is generally used as the main measurement method, and the remaining methods are used for review, which cannot further improve the measurement accuracy of the propellant remaining amount to meet the high requirements of modern spacecraft on-orbit management during its life.

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