A Vector Ionospheric Delay Correction Method for GNSS Positioning and Navigation Wide Area Augmentation Service

Abstract

A new ionospheric delay correction method is proposed to improve the ionospheric correction accuracy of single frequency GNSS users. In the new method, the ionospheric grid point information is expanded from a single scalar vertical correction parameter to a vector of triple elements (the triple): vertical correction parameter, north correction parameter and east correction parameter. The new parameters are used to describe the variation of ionospheric delay correction caused by satellite azimuth. Using the observation data of the ground monitoring stations to fit the triple, and then broadcast the triple to the user. GNSS single frequency users can use the triple data to correct their own ionospheric delay. The testing results show that the correction error of the method is around 0.3 m lower than that of the scalar method.

Application of particle filter algorithm in satellite positioning and navigation system

“…According to the requirements of being real-time, the frequency of serial port transmission data is 1 Hz, so the DSP processor should decode and filter the transmitted data within one second and the number of particles should not be too much. After repeated tests, it is found that the number of particles is 60 [9][10].…”