A Real-time Diagnosis Method for Temperature Abnormality of On-orbit Satellite Thruster

Abstract

The invention discloses a real-time diagnosis method for abnormal temperature of an in-orbit satellite thruster. The present invention determines the parameters in the physical model of the temperature of the thruster under four working conditions according to the historical telemetry data of the satellites in orbit: the thermal radiation coefficient to the deep cold space, the temperature increase of the unit mass of the thruster due to the heating of the heater of the thruster The temperature increment of thruster unit mass due to propellant combustion and the temperature increment of thruster unit mass due to sunlight; according to the physical model of thruster temperature under the four working conditions, the working condition at the current monitoring time Real-time prediction of the thruster temperature under the satellite, and a dynamic alarm threshold is obtained after expanding a certain range according to the actual situation of the satellite, so as to realize real-time monitoring of the working state of the thruster and abnormal temperature alarm during the orbit control process, and real-time monitoring of abnormal temperature of the thruster. Diagnostic and early warning research.

Description

technical field [0001] The invention relates to an on-orbit satellite propulsion system, in particular to a real-time diagnosis method for abnormal temperature of an on-orbit satellite thruster. Background technique [0002] At present, the propulsion system of medium and high orbit satellites in my country adopts a dual-component unified propulsion system. The 10N thruster is the only executive component that provides thrust in the propulsion subsystem. Whether it works normally or not directly determines the success or failure of satellite orbit control. At present, there are mainly two means to carry out the state monitoring of 10N thrusters: (1) monitoring through the change of satellite attitude angle; (2) evaluating through the orbit measurement results after the control is over. There are following deficiencies in the above two means: [0003] (1) In general, there are differences in the thrust of the paired thrusters of the satellite. Under normal circumstances, the...

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Problems solved by technology

[0003] (1) In general, there are differences in the thrust of the paired thrusters of the satellite. Under normal circumstances, the ignition of the paired thrusters will also cause attitude fluctuations. The generated disturbance moment will be gradually absorbed by the momentum device, and the abnormal working conditions of the thruster cannot be completely reflected in the attitude fluctuation. Therefore, the abnormal working conditions of the thruster that cause the attitude fluctuation and the attitude fluctuation in the normal situation are not obvious can not be found by using the attitude angle change monitoring method

[0004] (2) Although all abnormalities of the 10N thruster can be found by the evaluation of the orbit measurement results after the control is completed, it lacks real-time performance

However, it is still relying on manual judgment and analysis of the temperature trend of the 10N thruster. This method has the following problems: First, in the face of the situation of hundreds of satellites in orbit at the end of the 12th Five-Year Plan, it is impossible to complete real-time judgment and analysis by manual labor; second, The conclusion obtained in this way relies heavily on the experience of on-orbit monitoring personnel, which is not conducive to the early detection of failure or performance degradation of the 10N thruster

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