Design and Implementation of Hitl Simulator Coupleing Communications Payload and Software Spacecraft Bus

• Main Authors: In-Jun Kim, Wan-Sik Choi
• Format: Article
• Language: English
• Published: Korean Space Science Society (KSSS) 2003-12-01
• Series: Journal of Astronomy and Space Sciences
• Subjects: modeling; simulation; communications transponder; telecommand; telemetry; CBS; CBSSIM; EGSE; PCTS
• Online Access: http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2003/v20n4/OJOOBS_2003_v20n4_339.pdf

Engineering qualification model payload for a communications and broadcasting satellite(CBS) was developed by ETRI from May, 2000 to April, 2003. For the purpose of functional test and verification of the payload, a real-time hardware-in-the-loop(HITL) CBS simulator(CBSSIM) was also developed. We assumed that the spacecraft platform for the CBSSIM is a geostationary communication satellite using momentum bias three-axis stabilization control technique based on Koreasat. The payload hardware is combined with CBSSIM via Power, Command and Telemetry System(PCTS) of Electrical Ground Support Equipment(EGSE). CBSSIM is connected with PCTS by TCP/IP and the payload is combined with PCTS by MIL-STD-1553B protocol and DC harness. This simulator runs under the PC-based simulation environment with Windows 2000 operating system. The satellite commands from the operators are transferred to the payload or bus subsystem models through the real-time process block in the simulator. Design requirements of the CBSSIM are to operate in real-time and generate telemetry. CBSSIM provides various graphic monitoring interfaces and control functions and supports both pre-launch and after-launch of a communication satellite system. In this paper, the HITL simulator system including CBSSIM, communications payload and PCTS as the medium of interface between CBSSIM and communications payload will be described in aspects of the system architecture, spacecraft models, and simulator operation environment.