基于不等间隔接收机钟差组合预报模型的辅助定位方法

发布时间：2018-05-14 02:04

本文选题：卫星导航 + 接收机钟差　；参考：《中南大学学报(自然科学版)》2014年02期

【摘要】：在典型城市或室内应用等情况下,卫星导航信号由于被频繁遮挡变而变得微弱甚至不可用,使得传统的定位模式难以满足连续定位的要求。针对此问题,分析接收机钟差辅助定位的可行性,建立原点插值条件下使残差平方和最小的多项式钟差预报模型和改进的非等间距灰色系统钟差预报模型,并提出一种基于不等间隔接收机钟差解算值序列的动态加权组合预测模型及相应的钟差辅助定位算法。该模型通过权值的合理选取可实现单一模型的最优组合,具有更高的预测精度和稳健性。实测结果表明:该组合模型对钟差解算值序列的预测是可行和有效的;对于50 s内的短时钟差辅助定位,定位误差与连续正常定位接近,仅降低2.76%,可有效提高可见卫星不足4颗时的定位连续性。
[Abstract]:In typical cities or indoor applications, satellite navigation signals become weak or even unavailable because of frequent occlusion, which makes the traditional positioning mode difficult to meet the requirements of continuous positioning. In order to solve this problem, the feasibility of auxiliary positioning of receiver clock difference is analyzed, and a polynomial clock error prediction model with minimum sum of squares of residual error and an improved prediction model of clock error in non-equal-spacing grey system under the condition of original interpolation are established. A dynamic weighted combined prediction model based on the solution sequence of the clock difference of the unequal interval receiver and the corresponding algorithm of the clock difference auxiliary location are proposed. This model can realize the optimal combination of a single model through the reasonable selection of weights, and has higher prediction accuracy and robustness. The experimental results show that the combined model is feasible and effective to predict the sequence of clock difference solutions, and the positioning error is close to that of continuous normal positioning for the short clock difference auxiliary positioning within 50 s. Only reducing 2.76 can effectively improve the positioning continuity when the visible satellite is less than 4.
【作者单位】：国防科技大学电子科学与工程学院;第二炮兵工程大学四系;
【基金】：教育部新世纪优秀人才支持计划项目(NCET-08-0144)
【分类号】：TN851

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