REALIZING HIGH-RATE SYSTEMS: A TECHNOLOGY STUDY REDUCED TO PRACTICE for LANDSAT-D

Abstract

Generalized use of ECL in telemetry systems requires the reduction of transmission line theory, power distribution, topology considerations, and device characteristics to an implementation that is reproducible, permits rapid changes, and is cost effective. Bringing high data rates (up to 150 Mb/s) to everyday status was one goal in the development of a LANDSAT-D format synchronizer. The unit had to perform preamble and minor frame synchronization followed by decoding, decommutation, and formatting at the Thermatic Mapper real-time rate of 85 Mb/s. To additionally handle MSS and standard telemetry, as well as stream simulation and bit error rate measurements, a generalized solution was required. This is in opposition to a specially designed unit to fulfill only LANDSAT mission requirements. To produce the unit best suited to telemetry disciplines where formats change rapidly, the unit was implemented using wire wrapped modules with the stated goals realized.