Telecommunications Division
Coding models, antenna designs, and optimization of spacecraft communications systems
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Power requirements for deep-space telecommunication links.
Power requirements for tracking, telecommand and telemetry of spacecraft over interplanetary distances, considering transmission problems, equipment weight and reliability
Brockman, M. H.↗
Mariner /Venus 1962/ flight telecommunication system
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Bryden, J. N.↗
Spacecraft telecommunications systems - A digital command system development
All digital, single channel command subsystem for spacecraft communication
Tegnelia, C. R.↗
Program on application of communications satellites to educational development. Computer-based instruction: A background paper on its status, cost/effectiveness and telecommunications requirements
Status, cost/effectiveness, and telecommunication/satellite requirements of computer-based instruction
Singh, J. P.↗
An efficient and versatile telemetry subcarrier demodulation technique for deep space telecommunications
Wideband subcarrier frequencies demodulation technique for uncoded or coded PSK telemetry over large input SNR range for deep space interplanetary communication
Brockman, M. H.↗
Interplex: An analysis of optimized power allocations for two and three channel PSK/PM telecommunications systems
Optimal design concepts are presented for two- and three-channel telemetry modes in the context of the Mariner Venus-Mercury 1973 mission and the usefulness of interplex modulation techniques is discussed. These ideas are applied as an example to one Mariner Venus-Mercury 1973 telemetry mode to demonstrate that interplex can reduce the required total average power by more than 2 dB in some cases.
Levitt, B. K.↗
Tracking and data relay satellite system configuration and tradeoff study. Volume 2: Part 2 telecommunications design
For abstract, see .
Hill, T. E.↗
Activities of the Office of Telecommunications Management
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Morris, F. W., Jr.↗
A Practical Statistical Model for Telecommunications Performance Uncertainty
A statistical method, the probability distribution method, is presented which will give the probability of link performance values. The advantages of a design control procedure are preserved and optimum use of the system capabilities is permitted by improving the accuracy and completeness of the system model.
Yuen, J. H.↗
Study plan to identify long term national telecommunications need and priorities applying Delphi techniques (handbook)
A handbook that explains the basic Delphi methodology and discusses modified Delphi techniques is presented. The selection of communications experts to participate in a study, the construction of questionnaires on potential communications developments, and requisite technology is treated. No two modified Delphi studies were the same, which reflects the flexibility and adaptability of the technique. Each study must be specifically tailored to a particular case, and consists of seeking a consensus of opinion among experts about a particular subject and attendant conditions that may prevail in the future.
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117.6 kilobit telemetry from Mercury - A major deep space telecommunication advance
On March 29, 1974, Mariner 10 transmitted 562 clear, sharp pictures of Mercury in real time at 117.6 kilobits per second. The methods by which large area coverage at roughly 1 km resolution was achieved are described. In particular, it is shown how link performance was effectively improved by carefully assessing picture quality and coverage versus bit rate and bit error rate. A number of improvements as compared to the 1971 Mars Orbiter, Mariner 9, are outlined.
Clarke, V. C., Jr.↗
Telecommunications Division fourth harmonic power analyzer
A microprocessor-based instrumentation system was developed to be used in the measurement and analysis of fourth harmonic power generated by the DSN high-power transmitters.
Foster, C.↗
ATS-6 - Technical aspects of the Health/Education Telecommunications Experiment
An overview is given of the HET experiment on ATS-6. The paper is divided into nine parts, including a technical overview, a preliminary evaluation of the HET demonstration, a review of operations at the Denver uplink terminal, a discussion of remote ground terminals, a review of C-band comprehensive terminals and of S-band comprehensive terminals, and parts devoted to general network operations, technical management and effectiveness of the network, and the site equipment operator.
Boor, J. L.↗
Encoding and decoding a telecommunication standard command code
A simple encoder/decoder implementation scheme is described for the (63,56) BCH code which can be used to correct single errors and to detect any even-number of errors. The scheme is feasible for onboard-spacecraft implementation.
Benjauthrit, B.↗
A real time, low cost, data acquisition telecommunication network
The real time, low cost data acquisition communication network described features the use of asynchronous ASCII code transmissions operating at 30 characters per second on the dial-up telephone system. The network features an elaborate, but easily generated error checking system, operating in a line-by-line demand-response mode. The system is readily adaptable for any low speed computer-to-computer data transmissions requiring high reliability in data transmission. The network was developed for the acquisition of prelaunch wind data from the Eastern Test Range at Cape Kennedy.
Schulte, R. R.↗
TDRSS telecommunication system PN code analysis
The pseudonoise (PN) code library for the Tracking and Data Relay Satellite System (TDRSS) Services was defined and described. The code library was chosen to minimize user transponder hardware requirements and optimize system performance. Special precautions were taken to insure sufficient code phase separation to minimize cross-correlation sidelobes, and to avoid the generation of spurious code components which would interfere with system performance.
Gold, R.↗
Deep Space Network to Viking Orbiter telecommunication link effects during 1976 superior conjunction
Planning of the Viking superior conjunction by the Viking Project and the Deep Space Network is reviewed. Spacecraft and ground station activities and configuration during the three month superior conjunction period are presented and observations made are described.
Taylor, F. H. J.↗