Throughput Analysis of SBC for MSC on KOMPSAT-2

  • Heo H.P. (Optical Payload Department, Korea Aerospace Research Institute) ;
  • Kong J.P. (Optical Payload Department, Korea Aerospace Research Institute) ;
  • Kim Y.S. (Optical Payload Department, Korea Aerospace Research Institute) ;
  • Park J.E. (Optical Payload Department, Korea Aerospace Research Institute) ;
  • Chang Y.J. (Optical Payload Department, Korea Aerospace Research Institute) ;
  • Lee S.H. (Optical Payload Department, Korea Aerospace Research Institute)
  • Published : 2005.10.01

Abstract

The MSC is a remote sensing instrument with very high performance that is to be installed on KOMPSAT2 satellite. The MSC consists of EOS (Electro-Optic Subsystem), PMU (Payload Management Unit) and PDTS (Payload Data Transmission Subsystem). PMU controls and monitors all the other payload units by sending commands and collecting telemetry. PMU is in charge of interfacing between payload system and satellite bus system. PMU gets commands from ground-station via OBC (On-Board Computer) that is a main controller of the satellite bus system and sends telemetry to the ground-station via OBC. There is a processor module, called SBC (Single Board Computer) in the PMU. The SBC is a main controller of the MSC system. The main roles of the SBC are payload mission management, command validation and execution, telemetry collection and monitoring, ancillary data handling, event reporting, power control of payload sub-units and communication with these units. Intel's 80486DX2 processor has been used for the SBC. Due to the fact that the SBC plays important roles for imaging mission execution and handles a lot of control data that is required for payload operation, it is required to make analysis of the CPU load when it is in maximum operation mode. In this paper, the analysis and measurement results of the SBC throughput in the maximum operation mode.

Keywords