Apollo spacecraft systems analysis program - Investigation of recommended method for eliminating telemetry spurs
Elimination of spurs in Apollo spacecraft telemetry signal transmission
Lorio, L. 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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Introduction to AM baseband telemetry techniques
AM baseband telemetry system for wideband signal transmission emphasizing SSB, DSB and quadrature multiplexed DSB modulation techniques
Frost, W. O.↗
Method and Means for an Improved Electron Beam Scanning System-Patent
Electron beam scanning system for improved image definition and reduced power requirements for video signal transmission
Hilborn, E. H.↗
Tracking receiver Patent
Design and development of tracking receiver for tracking satellites and receiving radio signal transmissions under adverse noise conditions
Glomb, W. L.↗
Implantable biotelemetry systems
Design criteria for implantable biotelemetry systems, discussing RF signal transmission through conductive body tissue
Fryer, T. B.↗
Application of satellite beacon ionospheric data to solar corona Faraday rotation measurements
Linearly polarized CW signal transmission through near solar corona, measuring Faraday rotation
Stelzried, C. T.↗
Neuroendocrine transducer cells in mammals
Mammalian neurons, neuroendocrine transducer /pinealocytes and adrenomedullary chromaffin/ and endocrine cells communication properties, noting signal transmission
Wurtman, R. J.↗
Design of a 12-GHz multicarrier earth-terminal for satellite-CATV interconnection
The design and development of the front-end for a multi-carrier system that allows multiplex signal transmission from satellite-borne transponders is described. Detailed systems analyses provided down-converter specifications. The 12 GHz carrier down-converter uses waveguide, coaxial, and microstrip transmission line elements in its implementation. Mixing is accomplished in a single-ended coaxial mixer employing a field-replacable cartridge style diode.
Newman, B. A.↗
Erosion, transportation and the nature of the Maria
Lunar Orbiter and Apollo photographs of the moon and laboratory simulations of a surface transportation mechanism are discussed. Studies of shoulders at junctions of old mountains with flat mare surfaces show that the crater density in the shoulder is lower than that in the neighboring ground. The crisscross pattern is very pronounced on the mountain slope, is on the shoulder in a smaller scale, and is absent on the mare surface. It is concluded that the material forming the shoulders came there as a consequence of a surface transportation mechanism, and that the shoulders reached their present configuration later than the final shaping of the mare surface. Seismic signal transmission and mascon distribution data indicate that the filling of mare basins did not occur in a similar manner. An electrostatic mechanism for surface transportation was studied experimentally by bombarding material with electrons. An electric field resulted which was capable of dislodging and moving grains. It was also found that the junction line between different materials remains sharp, and materials do not mix even when the junction line itself moves.
Gold, T.↗
A centre for accommodative vergence motor control
Latencies in accommodation, accommodative-vergence, and pupil-diameter responses to changing accommodation stimuli, as well as latencies in pupil response to light-intensity changes were measured. From the information obtained, a block diagram has been derived that uses the least number of blocks for representing the accommodation, accommodative-vergence, and pupil systems. The signal transmission delays over the various circuits of the model have been determined and compared to known experimental physiological-delay data. The results suggest the existence of a motor center that controls the accommodative vergence and is completely independent of the accommodation system.
Wilson, D.↗
The Jupiter pioneers
The accomplishments of the Pioneer 10 space probe are described through artist concept drawing and concisely written documentation. Illustrations are provided of the following: (1) photography of planet Jupiter, (2) planet Jupiter magnetic fields, (3) Pioneer 10 configuration with emphasis on signal transmission capability, (4) analysis of the Pioneer 10 trajectory, (5) the characteristics of planet Jupiter and the orbiting moons, and (6) a cross-sectional respresentation of the composition of the planet Jupiter. The plaque which is carried by the Pioneer 10 to indicate earth civilization by astronomical symbols, binary numbers, and drawings is shown.
Source record↗
Electronics plus fluidics for V/STOL flight control
The redundant digital fly by wire flight control system coupled with a fluidic system, which uses hydraulic pressure as its signal transmission means to provide pilot and feedback sensor control of airframe forcing functions is considered for application to the V/STOL aircraft. A potential fluidics system is introduced, and anticipated performance, weight, and reliability is discussed. Integration with the redundant electronic channels is explored, with the safety and mission reliability of alternate configurations estimated.
Hendrick, R. C.↗
Nimbus 6 Doppler processing using the Fairbanks calibration platform
A weighted least squares processor is examined. Research conducted in support of the NASA satellite aided Search and Rescue program is presented. An estimated NIMBUS 6 ephemeris, accurate to 1.5-2.5 km and 0.5-2.5 m/s relative to a reference orbit, is obtained during the three day signal transmission period. This suggests updating the knowledge of the relay satellite ephemeris by one reference beacon is needed during the Search and Rescue demonstration.
Koch, D. W.↗
Inflight lightning characteristics measurement system
A research data-gathering system being developed for inflight measurement of direct and nearby lightning strike characteristics is described. Wideband analog recorders used to record the lightning scenario are supplemented with high-sample-rate digital transient recorders with augmented memory capacity for increased time resolution of specific times of interest. The endless-loop data storage technique employed by the transient recorders circumvents problems associated with oscilloscopic techniques and allows unattended operation. System integrity and immunity from induced effects is accomplished by fiber-optics signal-transmission links, shielded system enclosures, and the use of a dynamotor for power system isolation.
Pitts, F. L.↗
Radio frequency arraying method for receivers
A method and apparatus for increasing the signal to noise ratio of a receiving facility for coherent frequency reception by arraying receiving systems using separate antennas for each, or one antenna for all systems are presented. One system is operated with a carrier tracking loop to provide a first local oscillator frequency for the first and all other systems arrayed, with individual tracking loops in all other systems operated at IF for tracking out any phase differences due to separate group delays using an adjustable phase shifter for a second reference to compensate for different group delays in the antenna and low noise amplifier of each of the other systems. The second IF output of all systems is summed into the first system. This technique may also be used when two systems are arrayed to an antenna designed for circular or linear polarization diversity reception to effectively provide the same signal to noise ratio for both polarized signal transmission channels that would result from matched polarization. An arrangement adapted to high rate telemetry reception is disclosed. With additional components, the same arrangement is adapted to provide low rate telemetry reception as well.
Brockman, M. H.↗
Automated installation of large platform utilities
The capabilities of the assembler in installing nonstructural platform systems were assessed. These systems include electrical power distribution, heat transport, command and data signal transmission, and payload data transmission. The effects of including installation of utilities on the assembly process and on the design, operation, and performance of the assembler were evaluated. In addition, any special requirements on the assembler and/or the platform due to the installation of utilities were identified. The procedure followed was to define a set of candidate utility characteristics and installation requirements, define and design installation concepts, and perform an assessment of impacts on the assembler and its operation.
Vernon, R. M.↗
Fiber-optic sensing in cryogenic environments
Passive optical sensors using fiber-optic signal transmission to a remote monitoring station are explored as an alternative to electrical sensors used to monitor the status of explosive propellants. The designs of passive optical sensors measuring liquid level, pressure, and temperature in cryogenic propellant tanks are discussed. Test results for an experimental system incorporating these sensors and operating in liquid nitrogen demonstrate the feasibility of passive sensor techniques and indicate that they can serve as non-hazardous replacements for more conventional measuring equipment in explosive environments.
Sharma, M.↗
Role of optical computers in aeronautical control applications
The role that optical computers play in aircraft control is determined. The optical computer has the potential high speed capability required, especially for matrix/matrix operations. The optical computer also has the potential for handling nonlinear simulations in real time. They are also more compatible with fiber optic signal transmission. Optics also permit the use of passive sensors to measure process variables. No electrical energy need be supplied to the sensor. Complex interfacing between optical sensors and the optical computer is avoided if the optical sensor outputs can be directly processed by the optical computer.
Baumbick, R. J.↗