Browsing by Subject "Microcomputers -- Buses."
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Item Data compression application to the MIL-STD 1553 avionics data bus.(2006-05-11T16:11:15Z) Weston, Bron O.; Duren, Russell Walker.; Thompson, Michael Wayne.; Engineering.; Baylor University. Dept. of Electrical and Computer Engineering.With the current state of legacy military avionic systems reaching its ceiling in memory space, processing power, and data-bus through-put (bandwidth), a need has arisen to maximize its limited resources to avoid extensive costs of system overhaul. Specifically, F/A-18 C/D Aircraft is approaching message capacity on its MIL-STD-1553 buses. To slow this assent to capacity limits, one possible solution implements data compression techniques to increase bandwidth. In these efforts, this thesis examines different lossless compression schemes to find ideal options to consider for implementation on MIL-STD-1553 based F/A-18 C/D Aircraft. Several compression routines are identified that provide significant data compression while requiring very little computational effort. A surprising benefit is that the reduction in wasted time spent waiting on data communication more than offsets the time required to compress and decompress the data.Item Implementation of lossless compression algorithms for the MIL-STD-1553.(2009-04-01T19:25:47Z) Lam, Bernard O.; Thompson, Michael Wayne.; Duren, Russell Walker.; Engineering.; Baylor University. Dept. of Electrical and Computer Engineering.This thesis focuses on the bandwidth limitations faced by the legacy MIL-STD-1553 data bus. In order to improve bandwidth performance, lossless implementations of data compression routines have been proposed. Using data bus captures from the F/A-18 C/D simulator it has been possible to determine data characteristics, resulting in statistics showing the inherent redundancies within the data. This thesis proposes three compression algorithms which have been developed for use on the MIL-STD-1553 data bus. The three methods are Common Value Tracking, Modified Run-Length Encoding, and Differential Encoding. It will be shown that in some cases, compression ratios over 10 to 1 are possible, significantly improving the data transfer capabilities of the legacy communication system. The compression algorithms have been designed to provide bounded deterministic operation as required by real-time systems. In this thesis we will explore the strengths and weakness of each of these algorithms and also the decisions and challenges associated with integration with MIL-STD-1553 systems.