卫星导航中电离层误差校正技术现状与发展

Status and development of the ionospheric error correction techniques in satellite navigation

  • 摘要: 电离层误差严重影响着GNSS的定位精度,GPS、BDS、Galileo、GLONASS有不同的电离层误差校正方法. 全文概述了电离层误差校正方法,综述了单频电离层误差校正、双频电离层误差校正及多频电离层误差校正等技术的原理与发展现状. 在单频电离层误差校正技术中总结了增强系统中的电离层误差校正技术、北斗全球电离层延迟修正模型(BeiDou global ionospheric delay correction model, BDGIM)、Klobuchar模型、单频电离层误差校正技术的优化—附加国际参考电离层(international reference ionosphere, IRI)约束模型和NeQuick-G模型;在双频电离层误差校正技术中重点总结了双频消电离层误差、无电离层组合模型及PPP-RTK技术中电离层误差校正方法;在多频电离层误差校正技术中介绍了高阶项改正和地磁场建模对电离层误差校正技术的优化与改进. 最后,对电离层误差校正技术及其改进方法进行了分析,总结了其发展趋势与方向.

     

    Abstract: Ionospheric error seriously affects the positioning accuracy of the global navigation satellite system. GPS, BDS, Galileo and GLONASS all adopt different ionospheric error correction methods. The ionospheric error correction methods in satellite navigation are introduced, and the principle and development of single frequency ionospheric error correction, dual-frequency ionospheric error correction and multi-frequency ionospheric error correction are summarized in this paper. In the single frequency correction, the ionospheric error correction techniques in enhanced systems, BDGIM model, Klobuchar model, optimization of single frequency ionospheric error correction technology-IRI constraint model and NeQuick-G model are summarized; In the dual-frequency correction, the ionosphere-free model and the ionospheric error correction methods in the PPP-RTK technology are summarized; In the multi-frequency correction, the optimization and improvement of ionospheric error correction technique with the high order correction and geomagnetic field model are summarized. Finally, the ionospheric error correction techniques and their derivative are analyzed and encapsulated, the development trend and future hotspots of ionospheric error correction technology in satellite navigation are listed and analyzed.

     

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