Space programs summary no. 37-32, volume iii for the period january 1, 1965 to february 28, 1965. deep space network
Network system for communication and control of spacecraft on deep space exploration missions
SPACE COMMUNICATION↗
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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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Phase 1, simulation of selected discrete networks. Volume one - The logic model Final report
Methodology and Boolean equations for constructing discrete network system model
DISCRETE FUNCTION↗
Space programs summary no. 37-37, volume III FOR the period November 1, 1965 to December 31, 1965. The Deep Space Network
Deep space network - systems design, communications engineering developments and research, and tracking stations engineering and operations
SPACE COMMUNICATION↗
The deep space network - Space programs summary, volume 2
Deep Space Network systems engineering and analysis research projects
Source record↗
Space programs summary no. 37-55, volume 2 for the period 1 November to 31 December 1968. The deep space network
Deep space network system for communication and guidance of planetary and interplanetary space probes
Source record↗
The deep space network - An instrument for radio navigation for the Mariner mission to Mars - 1969.
Deep space network system for radio navigation of Mariner mission in 1969, discussing objectives, spacecraft, tracking and data system, mission accuracy, etc
Fearey, J. P.↗
Atlas/Centaur-26 Intelsat 4 (F3) operations summary
The design, development, and deployment of the Intelsat 4 satellite are discussed. Subjects considered are : (1) mission objective, (2) mission plan, (3) launch operations, (4) post launch operations, (5) communications equipment, and (6) test operations. Illustrations are provided to show the configuration of the satellite and launch vehicle and the operations intercommunication system network.
Source record↗
State space representations of distributed fluid line dynamics
The purpose of this paper is to demonstrate the convenience of using a systematic straight forward procedure to obtain meaningful dynamic information for a class of complex distributed parameter fluid line networks. System transients in the time domain are determined by means of state space techniques. Digital computer implementation yields a simple but consistent way of obtaining overall system time solutions. A step-by-step analysis procedure flow chart is shown in Appendix I which illustrates the basic approach for modeling, approximating and selecting digital techniques for simulating the dynamic response of fluid line systems.
Yao, H.↗
A computer program for analyzing unresolved Mossbauer hyperfine spectra
The program for analyzing unresolved Mossbauer hyperfine spectra was written in FORTRAN 4 language for the Control Data CYBER 170 series digital computer system with network operating system 1.1. With the present dimensions, the program requires approximately 36,000 octal locations of core storage. A typical case involving two innermost coordination shells in which the amplitudes and the peak positions of all three components were estimated in 25 iterations requires 30 seconds on CYBER 173. The program was applied to determine the effects of various near neighbor impurity shells on hyperfine fields in dilute FeAl alloys.
Schiess, J. R.↗
Examination of the DSN X-band weather specification
Effects of weather on Deep Space Network system performance at X-band are examined by comparing a record of 64 meter system noise temperatures with weather observations taken at approximately the same times and places.
Source record↗
Cargo Logistics Airlift Systems Study (CLASS). Volume 3: Cross impact between the 1990 market and the air physical distribution systems, book 2
Book 2 of this volume is divided into the following sections: (1) commodities and system networks; (2) future mode choice decisions and commodity air eligibility; (3) comparative cargo transportation costs - air, truck, rail and water; (4) elasticities of demand; (5) operating cost; (6) operating profit, rate making, and returns; (7) importance of rate and service on future aircraft; (8) potential market demand for new aircraft; (9) scenario of events affecting system/market growth; and (10) future study and technology requirements.
Burby, R. J.↗
A computer program for estimation from incomplete multinomial data
Coding is given for maximum likelihood and Bayesian estimation of the vector p of multinomial cell probabilities from incomplete data. Also included is coding to calculate and approximate elements of the posterior mean and covariance matrices. The program is written in FORTRAN 4 language for the Control Data CYBER 170 series digital computer system with network operating system (NOS) 1.1. The program requires approximately 44000 octal locations of core storage. A typical case requires from 72 seconds to 92 seconds on CYBER 175 depending on the value of the prior parameter.
Credeur, K. R.↗
The Telecommunications and Data Aquisition Report
Tracking and ground-based navigation techniques are discussed in relation to DSN advanced systems. Network data processing and productivity are studied to improve management planning methods. Project activities for upgrading DSN facilities are presented.
Posner, E. C.↗
Statistical methodologies for the control of dynamic remapping
Following an initial mapping of a problem onto a multiprocessor machine or computer network, system performance often deteriorates with time. In order to maintain high performance, it may be necessary to remap the problem. The decision to remap must take into account measurements of performance deterioration, the cost of remapping, and the estimated benefits achieved by remapping. We examine the tradeoff between the costs and the benefits of remapping two qualitatively different kinds of problems. One problem assumes that performance deteriorates gradually, the other assumes that performance deteriorates suddenly. We consider a variety of policies for governing when to remap. In order to evaluate these policies, statistical models of problem behaviors are developed. Simulation results are presented which compare simple policies with computationally expensive optimal decision policies; these results demonstrate that for each problem type, the proposed simple policies are effective and robust.
Saltz, J. H.↗
Two-watt, 4-Kelvin closed cycle refrigerator performance
A 2-watt, 4-K helium refrigerator using the Gifford-McMahon/Joule Thomson cycle is described. The unit features a removable displacer cylinder and high-efficiency, low-pressure drop heat exchangers. These improvements result in a 100 percent increase in cooling power over the existing Deep Space Network system. The effects of the heat exchanger efficiency and Gifford-McMahon expander performance on refrigerator capacity are also discussed.
Britcliffe, M.↗
First Annual Workshop on Space Operations Automation and Robotics (SOAR 87)
Several topics relative to automation and robotics technology are discussed. Automation of checkout, ground support, and logistics; automated software development; man-machine interfaces; neural networks; systems engineering and distributed/parallel processing architectures; and artificial intelligence/expert systems are among the topics covered.
Griffin, Sandy↗
NAS: The first year
Discussed are the capabilities of NASA's Numerical Aerodynamic Simulation (NAS) Program and its application as an advanced supercomputing system for computational fluid dynamics (CFD) research. First, the paper describes the NAS computational system, called the NAS Processing System Network, and the advanced computational capabilities it offers as a consequence of carrying out the NAS pathfinder objective. Second, it presents examples of pioneering CFD research accomplished during NAS's first operational year. Examples are included which illustrate CFD applications for predicting fluid phenomena, complementing and supplementing experimentation, and aiding in design. Finally, pacing elements and future directions for CFD and NAS are discussed.
Bailey, F. R.↗
NASA PC software evaluation project
The USL NASA PC software evaluation project is intended to provide a structured framework for facilitating the development of quality NASA PC software products. The project will assist NASA PC development staff to understand the characteristics and functions of NASA PC software products. Based on the results of the project teams' evaluations and recommendations, users can judge the reliability, usability, acceptability, maintainability and customizability of all the PC software products. The objective here is to provide initial, high-level specifications and guidelines for NASA PC software evaluation. The primary tasks to be addressed in this project are as follows: to gain a strong understanding of what software evaluation entails and how to organize a structured software evaluation process; to define a structured methodology for conducting the software evaluation process; to develop a set of PC software evaluation criteria and evaluation rating scales; and to conduct PC software evaluations in accordance with the identified methodology. Communication Packages, Network System Software, Graphics Support Software, Environment Management Software, General Utilities. This report represents one of the 72 attachment reports to the University of Southwestern Louisiana's Final Report on NASA Grant NGT-19-010-900. Accordingly, appropriate care should be taken in using this report out of context of the full Final Report.
Dominick, Wayne D.↗