多模多频卫星导航系统码偏差统一定义与处理方法

精确处理和修正观测量偏差（OSB）是有效发挥多模多频优势,提升GNSS服务和应用效能的前提和基础，已成为国内外卫星导航高精度定位领域研究的热点问题之一。国际GNSS服务组织（IGS）和国际大地测量协会（IAG）专门成立了工作组推动相关工作。然而，目前有关观测量偏差处理的方法仍存在着定义不统一、求解不严密、使用不便捷等突出问题，给实时高精度定位应用带来诸多不利因素。针对此，首先阐述了中国科学院（CAS）电离层分析中心码偏差产品的定义、估计策略和使用方法，然后给出了部分精度评估和分析。结果表明：CAS、CODE和DLR发布的码偏差参数一致性优于0.30ns，CAS码偏差月稳定性优于0.15ns。相关工作对于推动多模多频GNSS在电离层监测、高精度定位和授时定时等领域的应用具有重要参考价值。

A Unified Definition and Processing Method of Observable-Specific Signal Biases for Multi-mode and Multi-frequency Global Navigation Satellite System

Accurate processing and correction of observable-specific signal bias(OSB) is the premise and foundation for effectively taking the advantages of multi-mode and multi frequency to improve the service and application efficiency of GNSS, and it has become one of the hot issues in the field of high-precision positioning of satellite navigation. The International GNSS Service(IGS) and the International Association of Geodesy(IAG) have set up working groups to facilitate the development in this field. This paper focuses on the definition, estimation strategy and application method of OSB products developed by the ionospheric analysis center of Chinese Academy of Sciences in recent years, and gives some accuracy evaluations and analysis results. The experimental results show that the consistency of OSB from CAS, Center for Orbit Determination in Europe(CODE) and German Aerospace Center DLR is better than 0.30ns, and the monthly stability of CAS OSB is better than 0.15ns. The related work has important reference value for promoting the application of multi-mode and multi-frequency GNSS in ionospheric monitoring, high-precision positioning and timing.