卫星电源系统的数字伴飞建模方法

Modeling method for digital accompanying flight of satellite power supply system

电源系统是卫星的重要部件,为在轨卫星提供连续稳定的能源。建立卫星电源系统数字伴飞模型,对于其在轨状态的监测、模拟、控制、预测等具有重要的意义。针对现有模型保真度较低、虚实同步困难的问题,本文提出一种卫星电源系统的数字伴飞建模方法。首先,通过电路等效法、数学等效法,状态空间平均的小信号建模等方法建立卫星电源系统高保真机理模型。其次,使用遥测数据动态参数辨识和参数提取的方法获取模型的动态输入输出,驱动机理模型动态更新。最后,利用高轨遥感卫星开展模型的数字伴飞实验验证。实验结果表明,本文提出的卫星电源伴飞模型典型输出参数的准确率高于95%,且可与在轨卫星实现0.5 s/次的虚实同步映射与数字伴飞。

The power supply system is an important component of the satellite,providing continuous and stable energy for satellites on orbit.Establishing a digital accompanying flight model for the satellite power supply system is of great significance for the monitoring,simulation,control,and prediction of its on-orbit status.Aiming at the problems of low fidelity and difficulty in virtual and real synchronization of existing models,a modeling method for digital accompanying flight of satellite power supply systems is proposed.Firstly,a high-fidelity mechanism model of the satellite power supply system is established through the circuit equivalent method,mathematical equivalent method,averaged model-state space and small signal method and others.Secondly,in order to obtain the dynamic input and output,the methods that telemetry data dynamic parameter identification and parameter extraction are used,thereby driving the dynamic update of the mechanism model.Finally,experiments were carried out using high-orbit remote sensing satellites to verify the digital accompanying flight of the model.As shown in the experimental results,the typical output parameters of the digital flight simulation model presented in this paper demonstrate an accuracy exceeding 95%.Moreover,the model can achieve virtual and real synchronization mapping and digital accompanying flight with on-orbit satellites every 0.5 seconds.