利用Klobuchar模型和载波平滑伪距观测值模型分析电离层变化

Analysis of ionospheric delay based on klobuchar model and carrier phase smoothed pseudo-range obervation model

在GPS测量中,电离层延迟是一个比较重要的误差来源。对于单频接收机,由广播星历中提供Klobuchar模型参数进行电离层延迟改正;对于双频接收机,采用载波平滑伪距观测值计算电离层延迟改正。利用深圳市连续运行卫星定位参考站系统的双频观测数据,分别用Klobuchar模型和载波平滑伪距观测值两种方法计算深圳市5个CORS站上的电离层延迟值,对两种模型计算的电离层延迟值进行比较,分析深圳市电离层延迟的周日变化规律。

For GPS measurement, the ionospheric delay is one of the important error sources. For single frequency GPS receiver, the Klobuchar model parameters are provided from broadcast ephemeris to correct the delay, and for dual frequency GPS receiver, the ionospheric delay can be corrected by carrier phase smoothed pseudo-range observation. The ionospheric delays of five CORS in Shenzhen are calculated by using Klobuchar model and carrier phase smoothed pseudo-range based on Shenzhen continuous operational satellite positioning reference system. At last, the results are compared and the daily variation are analyzed.