基于卫星姿态敏感器和星载天线信息的联合姿态确定方法

为提高姿态估计的速度和精度,提出一种利用星载天线信息进行姿态确定的新方法。研究分析了天线接收信号中可以用于卫星姿态确定的信息,推导并建立了由误差四元数表示的天线测量残差线性模型。基于卫星姿态敏感器的测量残差模型和天线测量残差模型,组建了陀螺/红外地平仪/太阳敏感器/天线新型联合姿态确定系统,最后利用集中式测量融合滤波对卫星姿态进行估计。仿真结果表明,天线信息的引入可以显著提高姿态确定的精度,并使整个系统的收敛速度有明显提高。

A New Satellite Attitude Determination System Integrating Antennas with Attitude Sensors

Aim.To our knowledge,existing methods in the open literature1,2] still use attitude sensors alone;in our opinion,they cannot satisfy the increasing precision of satellite attitude determination required by satellite missions now.We propose utilizing attitude information inherently contained in antenna measurements to increase greatly the precision of attitude determination.In the full paper,we explain our attitude determination system in some detail;in this abstract,we just add some pertinent remarks to naming the first three sections of the full paper.Section 1 is:the residual error model of antenna measurements.In section 1,we analyze the information contained in antenna signals to be used for attitude determination and then establish the residual error model of antenna measurements expressed in terms of error quaternions as shown in eq.(11).Section 2 is:the residual error model of attitude sensor measurements.Section 3 is:the satellite attitude determination system integrating antennas with attitude sensors.In this section,using the residual error model of attitude sensor measurements and that of antenna measurements,we set up our satellite attitude determination system that integrates gyros,antennas,infrared horizon sensors and solar sensors by using the working principles of our system given in the block diagram as shown in Fig.1.Then we estimate the attitude of a satellite by fusing the measurements and utilizing the Kalman filtering.Finally we simulate our satellite attitude determination system.The simulation results,shown in Fig.2,indicate preliminarily that both the accuracy and convergence speed of attitude determination can be improved greatly by introducing the attitude information of antenna signals.