Use the magnetic vector for the observation information , the paper estimate the location and rate of the satellite , analysis of simulation results and the sources of error . to further enhance navigation accuracy , the paper study the unscented kalman filter , compare with the extend kalman filter . in the same initial conditions of the extend kalman filter , we do the simulation 其次,基于磁环境模拟系统的测量数据,本文研究了扩展卡尔曼滤波算法,建立了卫星的运动学和动力学方程,以地磁场矢量为观测信息,对卫星位置速度进行了估计,并分析了仿真结果及误差来源,为了进一步提高导航精度,本文又研究了unscented卡尔曼滤波算法,给出了原理及步骤,并与扩展卡尔曼滤波进行了比较分析。
According to faraday law on electromagnetic induction and the difference of the magnetic energy of ferromagnetic materials in their magnetization and demagnetization , it is clarified that the swing , vibration and periodic translational reciprocation of any object made of ferromagnetic material in geomagnetic field must cause spontaneous magnetization of the object itself 摘要依据法拉第电磁感应定律和铁磁性物质在磁化一退磁过程中的能量差异，阐明了铁磁性物体在地磁场中的摆动、振动和周期性往复平动都会引起该物体的自发磁化。
Through the analysis of the dynamic characteristic of geomagnetic intensity in a orbit , the magnetic dipoles produced by magnetorquer are expanded in fourier series . the new method of momentum unloading is educed according to the need of the sum of unloaded momentum , and the magnetic dipoles are figured out under the theory of optimal control 通过对在轨卫星地磁场强度的变化规律分析，将卫星磁力矩器产生的磁矩按富利哀级数展开，根据卫星所需卸载角动量大小，按照最优控制理论求出三轴磁矩取值，得到一种新的利用地磁场给飞轮卸载的方法。
Using piezoresistive accelerometers and magnetoresistance sensors measure the dynamic acceleration and geomagnetic field and through avr mcu software to calculate the attitude angular and azimuth . the fact of affecting the module is discussed in detail in this report and put forward the resolving scheme of key technology of digital filter , linear compensation , temperature compensation and magnetic field adjustment . the digital module has advantages of small size , light weight , low conception , high accuracy , all solid state and high reliability 本课题采用压阻式加速度计和磁阻传感器分别测量重力加速度和地磁场，通过avrmcu软件解算出姿态角和方位角，课题详细分析了影响模块性能指标的因素，就数字滤波、线性补偿、温度补偿、磁场修正等关键的技术问题提出了可行的解决方案，研制的数字化模块具有体积小、重量轻、低功耗、精度高、全固态、高可靠等特点，所有性能指标均满足设计要求，为姿态角测量提供了有效的手段。
