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伪卫星具有抗干扰能力强和布置灵活机动的特点,在增强卫星系统和独立组网为用户提供更高精度导航定位信息方面具有广阔的应用前景.研究了一种伪卫星/惯性组合导航的非线性补偿算法.由于伪卫星与用户的距离比卫星近得多,其非线性量测的影响也严重得多.采用二次项修正一定程度上弥补了传统线性化方法存在的模型误差大、滤波效果差甚至发散的问题.为避免求解非线性方程的困难使用了两步估计方法,大大降低了算法的复杂度.仿真结果表明,该算法可以显著提高伪卫星/惯性组合导航系统的性能,具有很高的实用性.
Pseudo-satellites have the characteristics of strong anti-jamming capability and flexible arrangement, which have broad application prospects in enhancing the satellite system and independent networking to provide users with more accurate navigation and positioning information.A pseudo-satellite / inertial integrated navigation Linear compensation algorithm.As the pseudo-satellite and the user's distance is much closer than the satellite, the non-linear measurement of the impact is also much more.Using quadratic term correction to a certain extent, make up the traditional linearization method has a large model error, filtering Poor performance and even divergence.In order to avoid the difficulty of solving nonlinear equations, a two-step estimation method is used, which greatly reduces the complexity of the algorithm.The simulation results show that this algorithm can significantly improve the performance of pseudolite / inertial integrated navigation system with High practicality.