GNSS系统间钟差辅助定位研究

发布时间：2018-04-08 12:11

本文选题：GNSS　切入点：兼容定位　出处：《武汉大学学报(信息科学版)》2017年07期

【摘要】：GNSS(global navigation satellite systems)系统时使用原子钟作为时间基准,相比使用晶振的GNSS接收机,其稳定度高出几个量级。GNSS系统间钟差相比接收机钟差具有更高的稳定度,如果可以充分利用此先验信息将有助于优化多GNSS系统的定位结果。分析如何充分利用系统间钟差更稳定这一先验信息,并测试引入这一先验信息对多系统单点定位结果的影响,推导了基于两种不同钟差估计方法的定位解算模型,给出了最小二乘和扩展卡尔曼滤波两种参数估计算法。通过比较不同模型和估计算法在静态和动态定位的实验结果,最小二乘法无法利用系统间钟差更稳定的特点改善定位精度;静态实验结果表明,扩展卡尔曼滤波自身有一定的降噪效果,若引入系统间钟差更稳定的先验信息,将更有利于减小噪声;动态实验结果表明,引入系统间钟差更稳定的先验信息可减弱扩展卡尔曼滤波的发散现象。
[Abstract]:GNSS (Global Navigation Satellite Systems) using atomic clocks as time reference system, compared to the GNSS receiver using the crystal oscillator, the stability is higher compared to the receiver clock error has a higher stability difference of several orders of magnitude between.GNSS minutes, if you can make full use of the prior information will help to optimize the multi GNSS system positioning the results of analysis. How to make full use of system clock more stable a priori information and test the effect of introducing a priori information on the results of single point positioning system, deduced two kinds of clock difference estimation method based on the positioning calculation model, gives the least squares estimation algorithm and extended Calman filter through two kinds of parameters. Comparison of different models and estimation algorithm in static and dynamic positioning of the experimental results, the least squares method to use system clock features more stable to improve positioning accuracy; static experiment The results show that the extended Calman filter has its own noise reduction effect, if the introduction of system clock more stable prior information, will be more conducive to reducing noise; dynamic experimental results showed that the introduction of system clock more stable prior information can weaken the extended Calman filter divergence.

【作者单位】：北京理工大学信息与电子学院;北京理工大学卫星导航电子信息技术教育部重点实验室;
【基金】：国家自然科学基金(61101128) 国家863计划(2013AA122103)~~
【分类号】：P228.4

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