Development of a command and telemetry processing interface to be independent of ground control systems

Abstract

The Johns Hopkins University Applied Physics Laboratory (APL) has developed numerous spacecraft for national security and civilian space applications that have used varied flight computers and ground control systems. On missions that have utilized different ground control systems, the command and telemetry (C&T) database development has been unique to the specific mission. On missions that have utilized a common ground control system, APL has leveraged a limited extent of commonality in the development of the C&T databases, which has shown promise in development, schedule, and cost efficiency and has improved the quality of the early C&T database deliveries. On its recent Radiation Belt Storm Probes mission (RBSP), APL developed a set of C&T tools to tackle the challenge of developing a common C&T database across multiple satellites, over full mission life cycles, that minimizes coupling with the core ground control system such that the use across different ground systems is maximized. This paper discusses the specific approach taken in evaluating the C&T database development for APL's past missions and the shortfalls that were encountered. Lessons learned were evaluated and decisions were made in implementing the RBSP C&T databases. The tool development is briefly discussed with an emphasis on the engineering use during satellite subsystem development. Recent successes during the testing are also presented. Finally, plans are described for continued improvement to the approach and tools for subsequent APL spacecraft so that the C&T database can be ported to other missions of interest.