International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California / A system to generate a contiguous high speed time division multiplexed (TDM)
spacecraft downlink data stream has been developed. The 25 MBPS downlink data
stream contains high rate real time imager data, intermediate rate subsystem processor
data, and low rate spacecraft housekeeping data. Imager data is transferred directly
into the appropriate TDM downlink data window using control signals and clocks
generated in the central data formatter and distributed to the data sources. Cable and
electronics delays inherent in this process can amount to several clock periods, while
the uncertainty and variations in those delays (e.g. temperature effects) can exceed the
clock period. Unique (patent pending) electronic circuitry has been included in the
data formatter to sense the total data gathering delay for each high speed data source
and use the results to control series programmable delay elements to equalize the
delays from all sources and permit the formation of a contiguous output data stream.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/608564 |
| Date | 10 1900 |
| Creators | Schwartz, Paul D., Hersman, Christopher B. |
| Contributors | The Johns Hopkins University |
| Publisher | International Foundation for Telemetering |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Proceedings |
| Rights | Copyright © International Foundation for Telemetering |
| Relation | http://www.telemetry.org/ |
Page generated in 0.0019 seconds