Extraterrestrial optical microscopy.
Extraterrestrial optical microscopy, discussing experiment, telemetry, data interpretation and instrument characteristics concerning biological, cytochemical and petrographic microscopes
Soffen, G. A.↗
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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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Goddard range and range rate system Design evaluation report
Tracking and telemetry data at VHF and S band frequencies from spacecraft for GRARR system
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Pioneer 7 TDS configuration
Metric and telemetry data acquisition instrumentation for Pioneer 7 space probe
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Analysis of a communication satellite for lunar far-side exploration
Analysis of communication satellite for lunar far-side exploration relaying color television, voice, high-bit-rate telemetry data, and ranging code from command and service, and lunar modules
Goodwin, C. H.↗
Revised lunar surface temperatures and thermal characteristics from Surveyor
Revised lunar surface temperature and thermal characteristics from Surveyor telemetry data
Hagemeyer, W. A.↗
Design and development of a micropound extended range thrust stand /MERTS/
Micropound extended range thrust stand /MERTS/ for testing electric thrustors for spacecraft auxiliary propulsion, providing three thrust measurement ranges and data telemetry system
Dennis, T.↗
RAE-A attitude determination ground support system
Radio astronomy Explorer A attitude determination via disk-oriented programming ground support system for reducing and calibrating telemetry data, attitude prediction and command, etc
Bonomo, P. J.↗
Television multiplexing system
TV multiplexing and broadband multichannel real time telemetry data transmission without loss between Kennedy Space Center and ground station for computer operation
Bruckner, B. G.↗
An approach to attitude determination for a spin-stabilized spacecraft (IMP 1)
The analysis and the FORTRAN program are presented for the determination of attitude of a spin-stabilized spacecraft. The use of telemetry data that provide information about two reference vectors and their relation to the spin is outlined. A technique for the determination of the spin-axis orientation that employs only simple calculations is described.
Fang, A. C.↗
Skylab thruster attitude control system
Preflight activities and the Skylab mission support effort for the thruster attitude control system (TACS) are documented. The preflight activities include a description of problems and their solutions encountered in the development, qualification, and flight checkout test programs. Mission support effort is presented as it relates to system performance assessment, real-time problem solving, flight anomalies, and the daily system evaluation. Finally, the detailed flight evaluation is presented for each phase of the mission using system telemetry data. Data assert that the TACS met or exceeded design requirements and fulfilled its assigned mission objectives.
Wilmer, G. E., Jr.↗
The Apollo X-ray fluorescence spectrometer
The Apollo X-ray fluorescence spectrometer was a part of a geochemical package flown on the Apollo 15 and 16 missions. The device was to map the concentrations of aluminum, magnesium, and silicon in the lunar regolith along the spacecraft ground track. A functional description of the spectrometer is given and the telemetry data format is discussed together with the pulse height analyzer, the pulse shape discriminator, questions of in-flight calibration, and the flight results.
Jagoda, N.↗
ATM CMG bearing failure analysis
The cause or causes for the failure of ATM CMG S/N 5 (Skylab 1) and the anomalies associated with ATM CMG S/N 6 (Skylab 2) were investigated. Skylab telemetry data were reviewed and presented in the form of parameter distributions. The theory that the problems were caused by marginal bearing lubrication was studied along with the effects of orbital conditions on lubricants. Bearing tests were performed to investigate the effect of lubricant or lack of lubricant in the ATM CMG bearings and the dispersion and migration of the lubricant. The vacuum and weightless conditions of space were simulated in the bearing tests. Analysis of the results of the tests conducted points to inadequate lubrication as the predominant factor causing the failure of ATM CMG S/N 5 (Skylab 1) and the anomalies associated with ATM CMG S/N 6 (Skylab 2).
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Determination of the satellite attitude and its motion about the center of mass
The algorithm requirements for the problem solving and factors determining the accuracy of the solution are analyzed. The types of telemetry data used and the models adopted for the satellite motion about the center of the mass are described. The scheme for the technique used to determine the attitude on the basis of magnetometer data is also discussed.
Khatskevich, I. G.↗
LANDSAT-2 launch and flight activation. Launch through orbit 50 and orbit adjust operation
The results of the analysis conducted on the telemetry data from the prelaunch, launch, and flight activation phases of LANDSAT-2 spacecraft are presented according to subsystems and interrelationships that exist between subsystems. Subsystem characteristics are included along with the flight evaluation results. Flight data are compared to baseline data established at the 20 C plateau during thermal vacuum testing of the spacecraft. Evaluation guidelines are derived from the specifications developed from the LANDSAT program objectives: (1) acquisition of multispectral images of the surface of the earth; and (2) use of the LANDSAT-2 receiving, frequency translating, and transmitting equipment as a relay system to gather data from fixed earth-based sensor platforms which are operated by individual investigators. Data are presented on the first 50 orbits of the spacecraft.
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Low cost computer subsystem for the Solar Electric Propulsion Stage (SEPS)
The Solar Electric Propulsion Stage (SEPS) subsystem which consists of the computer, custom input/output (I/O) unit, and tape recorder for mass storage of telemetry data was studied. Computer software and interface requirements were developed along with computer and I/O unit design parameters. Redundancy implementation was emphasized. Reliability analysis was performed for the complete command computer sybsystem. A SEPS fault tolerant memory breadboard was constructed and its operation demonstrated.
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Automatic control of a primary electric thrust subsystem
A concept for automatic control of the thrust subsystem has been developed by JPL and participating NASA Centers. This paper reports on progress in implementing the concept at JPL. Control of the Thrust Subsystem (TSS) is performed by the spacecraft computer command subsystem, and telemetry data is extracted by the spacecraft flight data subsystem. The Data and Control Interface Unit, an element of the TSS, provides the interface with the individual elements of the TSS. The control philosophy and implementation guidelines are presented. Control requirements are listed, and the control mechanism, including the serial digital data intercommunication system, is outlined. The paper summarizes progress to Fall 1974.
Macie, T. W.↗
Design study of a HEAO-C spread spectrum transponder telemetry system for use with the TDRSS subnet
The results of a design study of a spread spectrum transponder for use on the HEAO-C satellite were given. The transponder performs the functions of code turn-around for ground range and range-rate determination, ground command receiver, and telemetry data transmitter. The spacecraft transponder and associated communication system components will allow the HEAO-C satellite to utilize the Tracking and Data Relay Satellite System (TDRSS) subnet of the post 1978 STDN. The following areas were discussed in the report: TDRSS Subnet Description, TDRSS-HEAO-C System Configuration, Gold Code Generator, Convolutional Encoder Design and Decoder Algorithm, High Speed Sequence Generators, Statistical Evaluation of Candidate Code Sequences using Amplitude and Phase Moments, Code and Carrier Phase Lock Loops, Total Spread Spectrum Transponder System, and Reference Literature Search.
Weathers, G.↗
A flexible flight display research system using a ground-based interactive graphics terminal
Requirements and research areas for the air transportation system of the 1980 to 1990's were reviewed briefly to establish the need for a flexible flight display generation research tool. Specific display capabilities required by aeronautical researchers are listed and a conceptual system for providing these capabilities is described. The conceptual system uses a ground-based interactive graphics terminal driven by real-time radar and telemetry data to generate dynamic, experimental flight displays. These displays are scan converted to television format, processed, and transmitted to the cockpits of evaluation aircraft. The attendant advantages of a Flight Display Research System (FDRS) designed to employ this concept are presented. The detailed implementation of an FDRS is described. The basic characteristics of the interactive graphics terminal and supporting display electronic subsystems are presented and the resulting system capability is summarized. Finally, the system status and utilization are reviewed.
Hatfield, J. J.↗