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Proceedings Paper

Digital communication technology development for space applications at Goddard Space Flight Center
Author(s): Wai Fong; Pen-Shu Yeh; Victor Sank; David Fisher; Scott Hoy; Ernie Ekelman
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Paper Abstract

At NASA's Goddard Space Flight Center (GSFC), space qualified integrated circuits for several key elements in space communication systems have been in development to increase data return in bandwidth constrained channels for future missions. Particularly in the area of digital communication, the development includes data compression, channel coding and modulation. In on-board data compression area, development focuses on a high-speed compression scheme that serves both push-broom and frame sensors. The compression ratio can be easily adjusted for different applications from lossless to visually lossless. The algorithm conforms to the Consultative Committee on Space Data Systems (CCSDS) new compression recommendation to be released 2005. The radiation-tolerant (RT) hardware will afford 20 Msamples/sec processing on sensor data. For bandwidth efficient channel coding, newly developed low density paritycheck codes (LDPCC) will double channel utilization as compared to previously used concatenated convolutional/Reed- Solomon (CC/RS) coding scheme. An RT implementation of the encoder is expected to work up to 1 Gbps serving both low-rate and high-rate missions. In modulation, a versatile multi-function base-band modulator allows missions the flexibility to choose from 2 bits/symbol/Hertz quadrature phase shift keying (QPSK)-type schemes, to 2.0, 2.25, 2.5, and 2.75 bits/symbol/Hertz 8 phase shift keying trellis-coded modulation (8-PSK TCM) schemes--all CCSDS recommendations. Along with 8PSK, 16-quadrature amplitude modulation (16-QAM), 16-ampliture phase shift keying (16-APSK), all modulations are implemented in a single RT chip with expected throughput of over 300 Mbps. This paper describes the development of these three technology areas and gives an update on their availability for space missions.

Paper Details

Date Published: 26 August 2005
PDF: 12 pages
Proc. SPIE 5889, Satellite Data Compression, Communications, and Archiving, 58890F (26 August 2005); doi: 10.1117/12.617538
Show Author Affiliations
Wai Fong, NASA Goddard Space Flight Ctr. (United States)
Pen-Shu Yeh, NASA Goddard Space Flight Ctr. (United States)
Victor Sank, NASA Goddard Space Flight Ctr. (United States)
David Fisher, NASA Goddard Space Flight Ctr. (United States)
Scott Hoy, NASA Goddard Space Flight Ctr. (United States)
Ernie Ekelman, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 5889:
Satellite Data Compression, Communications, and Archiving
Bormin Huang; Roger W. Heymann; Charles C. Wang, Editor(s)

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