MMS Command and Data Handling

Abstract

The Command and Data Handling System which is part of the NASA Multi-mission Modular Spacecraft (MMS) represents a versatile time division multiple access approach to processing spacecraft commands and retrieving data on real-time, delayed or preprogrammed basis. This paper traces the command signals from operator keyboard to execution within the spacecraft and telemetry/data signals from on-board spacecraft measurement to display on the operator's CRT page. Key technical features throughout this end-to-end signal processing loop are described and discussed.