Abstract:

In view of at the problem that the traditional STK simulation algorithm for tracking angle of relay antenna cannot be used in real-time testing processing for spacecraft AIT, a real-time tracking algorithm for relay antenna is proposed and implemented in software. In this method, the orbit of spacecraft, antenna beam and coordinate system are applied to establish the equivalent model of the direction angle for relay antenna. Combining the spacecraft flight attitude and real-time telemetry, the tracking angle algorithm, real-time test result verification and closed-loop control strategy for relay antenna are realized. The experimental results show that the proposed method not only achieve real-time comparison of relay antenna angle tracking during the AIT test process, but also achieves the real-time prediction of TTC coverage under various flight attitude on orbit.The maximum TTC coverage of a single arc is increased by 13.3%. The method described in the study has been already applied to a certain type of spacecraft sub-system test and in orbit flight missions.

Key words: spacecraft, relay antenna, tracking algorithm, real-time, AIT, testing software, STK, TTC