一种用于电离层TEC监测的GNSS信号载波跟踪算法

全球卫星导航系统（GNSS）是电离层TEC监测中应用最普遍的手段. 目前方法通常是在传统导航用途的GNSS接收机输出的原始观测量基础上，经过数据后处理得到电离层TEC信息，其GNSS信号的跟踪处理算法依然采用GNSS导航接收机的算法. 针对GNSS系统用于电离层TEC监测的特殊性，提出一种称为GNSS双频信号和差联合跟踪的新算法，与传统方法相比，该算法直接跟踪电离层TEC的变化，可以提高电离层TEC跟踪的灵敏度和TEC的观测精度，改善电离层TEC监测性能. 

A new GNSS signal carrier tracking algorithm for ionospheric TEC monitoring

Currently, GNSS (Global Navigation Satellite System) is widely used in ionospheric TEC monitoring. The traditional method of GNSS monitoring ionospheric TEC is based on the original output measurements of navigation receiver, and then we obtain the ionospheric TEC information through the data conversion. The signal processing algorithm is also the navigation receiver algorithm which is used for navigating. The purpose of this work is to design a new GNSS dual-frequency signals tracking algorithm for the GNSS ionospheric TEC monitoring application, which is called sum-diff joint tracking algorithm. Compared with the traditional method, the algorithm is directly tracking the ionospheric TEC changes, and can improve the sensitivity of dual-frequency tracking and the TEC observation precision, so that it can improve the performance of GNSS monitoring ionospheric TEC.