77 research outputs found
Spaceborne memory organization, phase 1 Final report
Application of associative memories to data processing for future space vehicle
Data systems elements technology assessment and system specifications, issue no. 1
The ability to satisfy the objectives of future NASA Office of Applications Programs is dependent on technology advances in a number of areas of data systems. The technology of end-to-end data systems (space generator elements through ground processing, dissemination, and presentation, is examined in terms of state of the art, trends, and projected developments in the 1980 to 1985 timeframe. Capability is considered in terms of elements that are either commercially available or that can be implemented from commercially available components with minimal development
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An investigation to study the feasibility of on-line bibliographic information retrieval system using an APP
This thesis was submitted for the degree of Doctor of Philosophy and was awarded by Brunel University.This thesis reports an investigation on the feasibility study of a
searching mechanism using an APP suitable for an on-line bibliographic
retrieval, operation, especially for retrospective searches.
From the study of the searching methods used in the conventional
systems it is seen that elaborate file- and data- structures are
introduced to improve the response time of the system. These
consequently lead to software and hardware redundancies. To mask
these complexities of the system an expensive computer with higher
capabilities and more powerful instruction set is commonly used.
Thus the service of the systen becomes cost-ineffective.
On the other hand the primitive operations of a searching mechanism,
such as, association, domain selection, intersection and unions, are
the intrinsic features of an associative parallel processor. Therefore
it is important to establish the feasibility of an APP as a cost-effective
searching mechanise.
In this thesis a searching mechanism using an 'ON-THE-FLY' searching
technique has been proposed. The parallel search unit uses a Byte-oriented
VRL-APP for efficient character string processing.
At the time of undertaking this work the specification for neither the
retrieval systems nor the BO-VRL APP's were well established; hence a
two-phase investigation was originated. In the Phase I of the work a
bottom up approach was adopted to derive a formal and precise
specification for the BO-VRL-APP. During the Phase II of the work
a top-down approach was opted for the implementation of the searching
mechanism.
An experimental research vehicle has been developed to establish
the feasibility of an APP as a cost-effective searching mechanism.
Although rigorous proof of the feasibility has not been obtained,
the thesis establishes that the APP is well suited for on-line
bibligraphic information retrieval operations where substring searches
including boolean selection and threshold weights are efficiently
supported
Reconfigurable G and C computer study for space station use. Volume 2 - Final technical report Final report, 29 Dec. 1969 - 31 Jan. 1971
Design and development of reconfigurable guidance and control computer for space station applications - Vol.
Data systems elements technology assessment and system specifications, issue no. 2
The ability to satisfy the objectives of future NASA Office of Applications programs is dependent on technology advances in a number of areas of data systems. The hardware and software technology of end-to-end systems (data processing elements through ground processing, dissemination, and presentation) are examined in terms of state of the art, trends, and projected developments in the 1980 to 1985 timeframe. Capability is considered in terms of elements that are either commercially available or that can be implemented from commercially available components with minimal development
System design of the Pioneer Venus spacecraft. Volume 8: Command/data handling subsystems studies
Study tasks for the command and data handling subsystems have been directed to: (1) determining ground data systems, (GDS) interfaces and deep space network (DSN) changes, if required, (2) defining subsystem requirements, (3) surveying existing hardware that could be used or modified to meet subsystem requirements, and (4) establishing a baseline design. Study of the existing GDS led to the conclusion that the Viking configuration GDS can be used with only minor changes required for the Pioneer Venus baseline. Those changes required are associated with providing a predetection recording capability used during probe entry and descent. Subsystem requirements were first formulated with sufficient latitude so that surveys of existing hardware could lead to low cost hardware which, in turn, could modify more narrowly defined subsystem requirements
Space navigation guidance and control, volume 2
Apollo navigation and guidance - inertial measurement units and pulse torquing, optical measurements, guidance computer design, and attitude control system
Study of spaceborne multiprocessing, phase 1
Multiprocessing computer organizations and their application to future space mission
Analysis and Preliminary Design of an Advanced Technology Transport Flight Control System
The analysis and preliminary design of an advanced technology transport aircraft flight control system using avionics and flight control concepts appropriate to the 1980-1985 time period are discussed. Specifically, the techniques and requirements of the flight control system were established, a number of candidate configurations were defined, and an evaluation of these configurations was performed to establish a recommended approach. Candidate configurations based on redundant integration of various sensor types, computational methods, servo actuator arrangements and data-transfer techniques were defined to the functional module and piece-part level. Life-cycle costs, for the flight control configurations, as determined in an operational environment model for 200 aircraft over a 15-year service life, were the basis of the optimum configuration selection tradeoff. The recommended system concept is a quad digital computer configuration utilizing a small microprocessor for input/output control, a hexad skewed set of conventional sensors for body rate and body acceleration, and triple integrated actuators
Integrated Application of Active Controls (IAAC) technology to an advanced subsonic transport project. ACT/Control/Guidance System study. Volume 2: Appendices
The integrated application of active controls (IAAC) technology to an advanced subsonic transport is reported. Supplementary technical data on the following topics are included: (1) 1990's avionics technology assessment; (2) function criticality assessment; (3) flight deck system for total control and functional features list; (4) criticality and reliability assessment of units; (5) crew procedural function task analysis; and (6) recommendations for simulation mechanization
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