论文部分内容阅读
针对单纯差分GPS系统在精度、连续性、实时性方面存在的问题,提出了一种星间测距增强差分GPS的卫星编队组合相对导航方案。该组合相对导航系统由编队卫星中分别安装的GPS接收机、星间RF测量传感器,以及主星中运行的导航处理器组成,其中星间RF测量传感器集成了窄带通信功能,可在进行星间距离测量的同时同步进行GPS数据的互传。采用扩展Kalman滤波算法,结合简化动力学模型和GPS以及RF测量数据实现卫星编队的相对位置与速度的高精度实时递推解算。用模拟器采集数据进行了仿真验证,结果表明:在星间测距数据辅助下,星间基线长度在星间测距工作的30km范围内时,实时相对导航精度优于1mm;系统在GPS信号中断时仍可连续输出满足精度要求的相对位置、速度数据;系统初始化时间由单纯差分GPS相对导航系统的几十个历元降低到单点。
Aiming at the existing problems of accuracy, continuity and real-time performance of simple differential GPS system, a satellite formation combination relative navigation scheme based on inter-satellite ranging enhanced differential GPS is proposed. The combined relative navigation system is composed of GPS receiver, inter-satellite RF measurement sensor and navigation processor running in the main satellite, respectively. The inter-satellite RF measurement sensor integrates narrowband communication function, which can perform inter-satellite distance Measurement of simultaneous simultaneous GPS data transmission. The extended Kalman filter algorithm is combined with simplified dynamic model and GPS and RF measurement data to achieve high-precision real-time recursion calculation of the relative position and velocity of satellite formation. The simulation results show that the real-time relative navigation precision is better than 1mm when the inter-satellite base-line length is within 30km of inter-satellite distance measurement with the assistance of inter-satellite distance measurement data. When the interrupt is interrupted, the relative position and speed data that meet the accuracy requirements can be continuously output. The system initialization time is reduced to a single point by dozens of epochs of the simple differential GPS relative navigation system.