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

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.