Abstract: Receiver antenna phase center bias is a source of error must be considered in precise orbit determination using GPS. And PCV generally need multi-day observations data for joint estimation, so the estimation methods and its efficiency are particularly important. For the traditional PCV estimation method imperfect, such as the low computational efficiency, need to store days of normal equations and a priori information, this paper proposes an improved PCV synthesis method. By recursive way, the method doesn't need to store multi-day normal equations and the priori information about orbit, provide timely information PCV, then improve the efficiency of obtaining the PCV value, and provides a new way to achieve the Swarm satellite PCV solution. By the Swarm satellite precise orbit determination (POD), the result shows that the rapid PCV synthesis method can improve the efficiency of PCV synthesis, reducing the need for storage space. By comparing with external precision orbit, the result show that after the PCV correction, radial, tangential and normal precision of Swarm satellite orbit is improved, especially the normal precision most obviously, the average of about 23.3 mm; after the PCV correction, Swarm satellite orbit precision of all directions was superior to 2 cm.

Key words: spaceborne GPS, Swarm satellite, precise orbit determination, antennas phase center variation, precision analysis