Abstract: Ground accompanying flight system of spacecraft is composed of telemetry and telecontrol data interface and high precision digital simulation model. When accompanying flight system is working, telemetry and telecontrol data of the spacecraft are received through data interface in real time and injected into spacecraft model for synchronous simulation, so as to realize the ground digital twin system of the spacecraft in orbit. In this paper, the problem of the design and implementation of telemetry and telecontrol data interface is studied. Firstly, the telemetry and telecontrol data standardization package technology and the bidirectional mapping technology between digital model and data are introduced. Then the design and implementation of data interface are presented, and particularly the data receiving module, data drive and state synchronization module are introduced in detail. Finally, the interface is verified by practical engineering cases. The results show that the telemetry and telecontrol data interface works well and provides effective data support for ground accompanying flight system.

Key words: digital accompanying flight, telemetry and telecontrol data, data interface, digital twin, Modelica