一种新的北斗Klobuchar模型及其精度分析  

A New Klobuchar Model and Its Precision Analysis for Beidou Navigation Satellite System

作　　者：徐李冰 蔡成林[1] 陈光喜[2] 李春华[1] 

机构地区：[1]桂林电子科技大学精密导航技术与应用重点实验室,桂林市金鸡路1号541004 [2]桂林电子科技大学计算机科学与工程学院,桂林市金鸡路1号541004

出　　处：《大地测量与地球动力学》2015年第5期788-792,796,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(11033004;60263028);广西自然科学基金(2012GXNSFDA053027)

摘　　要：针对传统Klobuchar模型电离层延迟修正精度不高的问题,提出一种新的Klobuchar模型,以提高北斗导航系统的精度。利用欧洲定轨中心CODE的全球格网数据作为参考,使用松弛搜索法分别对覆盖中国区域的格网点和9个测站的观测数据进行算例分析。比较两种方法得出,新模型的修正精度相对于广播模型有大幅提高;新模型预报7d内的电离层时延值修正效果也比广播模型有明显改善;格网点上的平均修正精度从67.89%提高到78.44%,观测数据的平均修正精度从69.81%提升至82.34%。Ionospheric delay is the main error of satellite measurement.As the precision of the traditional Klobuchar model is not high,this paper presents a new Klobuchar model that is designed to improve the precision of Beidou satellite navigation systems.We use a GIM model for CODE as a reference and a relax iterative search method to conduct case analysis,including the China region＇s grid points and the observed data from nine stations.By comparing the two models,we find that the new model has a higher correction rate with respect to the broadcast model.Moreover,using the new model to forecast ionospheric delay within one week also has a better correction effect than the broadcast model.Statistical data further shows that the average correction precision improvement on grid points is from 67.89%to 78.44%,and the observed data of different stations from 69.81%to 82.34%.

关 键 词：电离层延迟模型 新的Klobuchar模型 松弛搜索 北斗导航系统 

分 类 号：P228[天文地球—大地测量学与测量工程]