Preliminary Results of GPS-Based Precision Orbit Determination of FY-3E Satellite GNOS Dual-Antenna

The Fengyun-3E satellite (FY-3E) is the world's first civilian weather satellite in the twilight orbit, which enables the solar panel to be designed with a larger size and vertically upwards to absorb more energy. In order to solve the problem of obstructing the observation field of the GNSS positioning antenna, the GNOS positioning antenna on the FY3E is designed as a dual-antenna combination cooperative observation method. Therefore, the precise orbit determination (POD) solution mainly needs to solve two problems: (1) the problem of inconsistent phase centres; (2) the problem of inconsistent hardware delay parameters. This article is aimed at the design structure of FY-3E satellite GNOS dual positioning antenna, uses the simplified dynamics non-differenced low-orbit satellite POD method and least squares quadratic (LSQ) recursive batch processing, subsequently to calculate the satellite's precise orbit, and at the end evaluates the POD precision with the overlapping arc inspection method. The results show that the satellite-borne GNSS low-orbit satellite with dual-antenna can observe more GNSS data, while the position accuracy of POD is centimetre level, and the speed accuracy is micrometres per second, finally the orbit accuracy is equivalent to that of the traditional unobstructed single positioning antenna for POD.