Engineering topics

Hill, T. E.

Publications and source records attributed to Hill, T. E..

8 records

NASA NTRS1974

System support software for the Space Ultrareliable Modular Computer (SUMC)

The highly transportable programming system designed and implemented to support the development of software for the Space Ultrareliable Modular Computer (SUMC) is described. The SUMC system support software consists of program modules called processors. The initial set of processors consists of the supervisor, the general purpose assembler for SUMC instruction and microcode input, linkage editors, an instruction level simulator, a microcode grid print processor, and user oriented utility programs. A FORTRAN 4 compiler is undergoing development. The design facilitates the addition of new processors with a minimum effort and provides the user quasi host independence on the ground based operational software development computer. Additional capability is provided to accommodate variations in the SUMC architecture without consequent major modifications in the initial processors.

Hill, T. E.↗

NASA NTRS1973

Tracking and data relay satellite system configuration and tradeoff study. Volume 8: Appendixes, part 1

The appendices to support the data involved in the design and development of the Tracking and Data Relay satellite are presented. The subjects discussed are: (1) spacecraft structural body shapes, (2) antenna configurations, (3) solar configurations, (4) telemetry equipment, and (5) reliability design practices.

Hill, T. E.↗

NASA NTRS1973

Tracking and data relay satellite system configuration and tradeoff study. Volume 1: Study summary

A study was conducted to determine the configuration and tradeoffs of a tracking and data relay satellite. The study emphasized the design of a three axis stabilized satellite and a telecommunications system optimized for support of low and medium data rate user spacecraft. Telecommunications support to low and high, or low medium, and high data rate users, considering launches with the Delta 2914, the Atlas/Centaur, and the space shuttle was also considered. The following subjects are presented: (1) launch and deployment profile, (2) spacecraft mechanical and structural design, (3) attitude stabilization and control subsystem, and (4) reliability analysis.

Hill, T. E.↗

NASA NTRS1973

Tracking and data relay satellite system configuration and tradeoff study. Volume 2: Part 2 telecommunications design

For abstract, see .

Hill, T. E.↗

NASA NTRS1973

Tracking and data relay satellite system configuration and tradeoff study. Volume 3: Part 2 spacecraft design

For abstract, see .

Hill, T. E.↗

NASA NTRS1972

Tracking and data relay satellite system configuration and tradeoff study. Volume 4: Spacecraft and subsystem design, part 1

The design and development of the Tracking and Data Relay satellite are discussed. The subjects covered are: (1) spacecraft mechanical and structural design, (2) attitude stabilization and control subsystem, (3) propulsion system, (4) electrical power subsystem, (5) thermal control, and (6) reliability engineering.

Hill, T. E.↗

NASA NTRS1972

Tracking and data relay satellite system configuration and tradeoff study. Volume 5: User impact and ground station design, part 1

The configuration of the user transponder on the Tracking and Data Relay satellite is described. The subjects discussed are: (1) transponder concepts and trades, (2) ground station design, (3) antenna configurations for ground equipment, (4) telemetry facilities, (5) signal categories, and (6) satellite tracking.

Hill, T. E.↗

NASA NTRS1972

Tracking and data relay satellite system configuration and tradeoff study. Volume 7: Telecommunications system summary, part 1

The baseline Tracking and Data Relay Satellite telecommunication system is described. The configurations of the user spacecraft terminal and the ground based terminal are illustrated. The system service and performance summary is developed to show the link support, modes of operation, and link performance to the low data rate and medium data rate user spacecraft. The link budget calculation is included to show a typical computation for each space-to-space and space-to-ground link with the assumptions used in each calculation.

Hill, T. E.↗