Abstract/Details

Data compression for space applications

Lu, Wei-Wei. 
 University of Sussex (United Kingdom) ProQuest Dissertations Publishing,  1992. C332496.

Abstract (summary)

The project on which this thesis is based to develop practical data compression techniques for the Soviet space mission Mars 94 - ELISMA project. Data compression techniques will be necessary because the amount of space-acquired data generated by the ELISMA project will be about five times the telemetry capacity available for this project.

Several new data compression algorithms have been proposed and are presented in this thesis: (1) Fast-adaptive Huffman coding. This algorithm splits the sample space into two trees for encoding, yielding fast-adaptive properties. These properties are significant when data are segmented so as to limit the error propagation. Also, the algorithm is able to offer a faster computation and requires smaller amount of memory than the conventional adaptive Huffman coding. (2) Adaptive cosine transform coding. The adaptive cosine transform and the bit allocation based on the marginal return technique are combined in this algorithm. The method of coefficients normalization has been found. Also, the error-correcting coding technique is included to make the transmitted data robust enough against the channel noise. (3) Adaptive Hadamard transform coding. This algorithm is identical to the adaptive cosine transform coding except in the transform core. Although this algorithm does not perform as well as the adaptive cosine transform coding in terms of the mean square error, it offers a faster transform algorithm. (4) Uniform vector quantization coding. This algorithm uniformly partitions vectors according to their activity and offers the simple procedure of codebook generation. This makes it suitable for real-time tasks. (5) Adaptive uniform vector quantization coding. This algorithm is based on the uniform vector quantization coding. It employs entropy coding techniques to obtain further compression efficiency, and adapts its codebook sizes to the data activity of the different subimages, resulting in fewer reconstructed errors. (6) Modified block truncation coding. This algorithm includes optimal quantization, differential and entropy coding, and error control.

Simulation results are given, the performance is analyzed, and the suitability of the new algorithms is discussed for the Mars 94 - ELISMA project.

Indexing (details)


Subject
Computer science
Classification
0984: Computer science
Identifier / keyword
Applied sciences
Title
Data compression for space applications
Author
Lu, Wei-Wei
Number of pages
158
Degree date
1992
School code
0545
Source
DAI-C 55/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
University/institution
University of Sussex (United Kingdom)
University location
England
Degree
D.Phil.
Source type
Dissertation or Thesis
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
C332496
ProQuest document ID
304001463
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
https://www.proquest.com/docview/304001463