Optimization of Telemetry Format with Accurate Timing Representation for a Distributed Telemetry System

A Distributed Telemetry System is generally employed where the length of the flight it is installed is more or the flight has many stages or multiple payloads in a long-range aerospace vehicle. The local data acquisition units employed in different sections of such a distributed telemetry system, communicate to the main data acquisition unit using an internal telemetry bus, sending their own sensors data and bus data acquired by them locally. The data received from these local data acquisition units needs to be represented accurately with respect to the time it was received by the sensor to analyse the data after the mission to avoid misleading conclusions. Two different schemes are proposed for this purpose and their optimization is explained in this paper to multiplex all the data received from local data acquisition units into a single bit stream at the main data acquisition unit without losing timing information.