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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 901 records · Page 50
All sourcesNASA NTRSDOE OSTI
NASA NTRS1982

Potential availability of diesel waste heat at Echo Deep Space Station (DSS 12)

Energy consumption at the Goldstone Echo Deep Space Station (DSS 12) is predicted and quantified for a future station configuration which will involve implementation of proposed energy conservation modifications. Cogeneration by the utilization of diesel waste-heat to satisfy site heating and cooling requirements of the station is discussed. Scenarios involving expanded use of on-site diesel generators are presented.

Hughes, R. D.↗
NASA NTRS1981

The Remote Analysis Station (RAS) as an instructional system

"Hands-on" training in LANDSAT data analysis techniques can be obtained using a desk-top, interactive remote analysis station (RAS) which consists of a color CRT imagery display, with alphanumeric overwrite and keyboard, as well as a cursor controller and modem. This portable station can communicate via modem and dial-up telephone with a host computer at 1200 baud or it can be hardwired to a host computer at 9600 baud. A Z80 microcomputer controls the display refresh memory and remote station processing. LANDSAT data is displayed as three-band false-color imagery, one-band color-sliced imagery, or color-coded processed imagery. Although the display memory routinely operates at 256 x 256 picture elements, a display resolution of 128 x 128 can be selected to fill the display faster. In the false color mode the computer packs the data into one 8-bit character. When the host is not sending pictorial information the characters sent are in ordinary ASCII code. System capabilities are described.

Rogers, R. H.↗
NASA NTRS1983

Space station needs, attributes, and architectural options study

The top level, time-phased total space program support system architecture is described including progress from the use of ground-based space shuttle, teleoperator system, extended duration orbiter, and multimission spacecraft, to an initial 4-man crew station at 29 deg inclination in 1991, to a growth station with an 8-man crew with capabilities for OTV high energy orbit payload placement and servicing, assembly, and construction of mission payloads in 1994. System Z, proposed for Earth observation missions in high inclination orbit, can be accommodated in 1993 using a space station derivative platform. Mission definition, system architecture, and benefits are discussed.

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NASA NTRS1983

Space station needs, attributes and architectural options study. Volume 3: Mission requirements

User missions that are enabled or enhanced by a manned space station are identified. The mission capability requirements imposed on the space station by these users are delineated. The accommodation facilities, equipment, and functional requirements necessary to achieve these capabilities are identified, and the economic, performance, and social benefits which accrue from the space station are defined.

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NASA NTRS1983

Space station needs, attributes and architectural options study review report

A manned space station (SS) produces a significant net economic benefit over its cost, as well as providing substantial social and performance benefits. The largest space station benefits arise from the ability of the SS to warehouse parts, orbit replacement units (ORUs) and fuel and thereby increase the Space Transportation System (STS) load factor. Substantial other benefits are made possibly by the basing of a returnable orbital transfer vehicles (ROTV) and the servicing of geosynchronous Earth orbit (GEO) satellites at the SS. It is recommended that a manned space station be placed in a 28.5 degree inclination orbit in 1990. This SS can be designed to grow, to be maintained and to incorporate new technology as it becomes available. It should be augmented with unmanned space platforms at both 28.5 degree and polar inclinations. These platforms are designed to have very high commonality with the SS resource models.

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NASA NTRS1983

A comparison of Frequency Domain Multiple Access (FDMA) and Time Domain Multiple Access (TDMA) approaches to satellite service for low data rate Earth stations

A technological and economic assessment is made of providing low data rate service to small earth stations by satellite at Ka-band. Various Frequency Domain Multiple Access (FDMA) and Time Domain Multiple Access (TDMA) scenarios are examined and compared on the basis of cost to the end user. Very small stations (1 to 2 meters in diameter) are found not to be viable alternatives to available terrestrial services. However, medium size (3 to 5 meters) earth stations appear to be very competitive if a minimum throughput of about 1.5 Mbs is maintained. This constrains the use of such terminals to large users and shared use by smaller users. No advantage was found to the use of FDMA. TDMA had a slight advantage from a total system viewpoint and a very significant advantage in the space segment (about 1/3 the required payload weight for an equivalent capacity).

Stevens, G.↗
NASA NTRS1983

Space stations - A historical perspective

This paper discusses the historical evolution of the space station concept, with particular attention to NASA plans in the 1960-1980 period. Emphasis is given to the changing justification presented for station development during that period and to the political context within which station proposals were evaluated.

Logsdon, J. M.↗
NASA NTRS1983

The importance of the space station as an element of the total Space System architecture

The paper describes the role of the Space Station in the ensemble of the space-based infrastructure necessary for achieving permanent manned presence in space. The major elements of the architecture are identified, functionally interrelated and discussed in terms of their evolutionary development as an extension of current STS capabilities. It is shown that they require a logical succession of flight R&D experiments and demonstrations using the Space Shuttle and the Space Station as test beds. The paper describes the interrelationships between the Space Station and the various major infrastructure elements and shows that the latter are indispensable for full operational utilization of the former. Only the total ensemble of the architecture provide all the necessary prerequisites for permanent manned presence in space.

Bekey, I.↗
NASA NTRS1983

Planning for long term control of Space Station

The National Aeronautics and Space Administration (NASA) is conducting conceptual studies concerning the development of a future U.S. Space Station. The Space Station navigation, guidance, and control functions must be performed over the projected long lifetime of the station. After examining the pertinent history of U.S. spacecraft, this paper examines how these long-term operations can be achieved, settling on autonomous operations as a desirable goal. The paper concludes with a recommended development approach.

Buchanan, H.↗
NASA NTRS1983

Orbit keeping attitude control for space station

It is pointed out that on-orbit configuration variability is expected to be a characteristic of a space station. The implementation of such a chracteristic will present reboost and thruster control system designers with a number of new challenges. The primary requirement for the space station orbit reboost (or orbit keeping) system is to ensure system viability for extended duration and prevent an uncontrolled reentry as with Skylab. For a station in a low earth orbit, earodynamic drag will be sufficient to cause relatively quick orbit altitude decay. A propulsion system is, therefore, needed to counteract the aerodynamic drag forces and to boost the vehicle to the desired orbit altitudes. A description is given of a typical reboost operational procedure and propellant requirements. Attention is given to thruster control systems, and aspects of reboost guidance.

Barrows, D.↗
NASA NTRS1983

Space station needs, attributes and architectural options study. Volume 3: Requirements

A typical system specification format is presented and requirements are compiled. A Program Specification Tree is shown showing a high inclination space station and a low inclination space station with their typical element breakdown, also represented along the top blocks are the interfaces with other systems. The specification format is directed at the Low Inclination space station.

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NASA NTRS1983

Space station needs, attributes and architectural options. Part 1: Summary

Candidate missions for the space station were subjected to an evaluation/filtering process which included the application of budgetary constraints and performance of benefits analysis. Results show that the initial space station should be manned, placed in a 28.5 deg orbit, and provide capabilities which include a space test facility, satellite service, a transport harbor, and an observatory. A space industrial park may be added once further development effort validates the cost and expanding commercial market for space-processed material. Using the space station as a national space test facility can enhance national security, as well as commercial and scientific interests alike. The potential accrued gross mission model benefit derived from these capabilities is $5.9B without the industrial park, and $9.3B with it. Other benefits include the lowering of acquisition costs for NASA and DoD space assets and a basis for broadening international participation.

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NASA NTRS1983

Space Station needs, attributes and architectural options. Volume 2, book 1, part 1: Mission requirements

The baseline mission model used to develop the space station mission-related requirements is described as well as the 90 civil missions that were evaluated, (including the 62 missions that formed the baseline model). Mission-related requirements for the space station baseline are defined and related to space station architectural development. Mission-related sensitivity analyses are discussed.

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NASA NTRS1984

Definition of technology development missions for early space stations. Large space structures, phase 2, midterm review

The large space structures technology development missions to be performed on an early manned space station was studied and defined and the resources needed and the design implications to an early space station to carry out these large space structures technology development missions were determined. Emphasis is being placed on more detail in mission designs and space station resource requirements.

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NASA NTRS1982

Space station needs, attributes and architectural options study. Briefing material, mid-term review

User mission requirements and their relationship to the current space transportation system are examined as a means of assuring the infusion of corporate ideas and knowledge in the space station program. Specific tasks include developing strategies to develop user consistency; determine DOD implication and requirements; and foster industry involvement in the space station. Mission alternatives; accrued benefits; program options; system attributes and characteristics; and a recommended plan for space station evolution are covered.

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NASA NTRS1984

Space Station commercial user development

The commercial utilization of the space station is investigated. The interest of nonaerospace firms in the use of the space station is determined. The user requirements are compared to the space station's capabilities and a feasibility analysis of a commercial firm acting as an intermediary between NASA and the private sector to reduce costs is presented.

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