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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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A Novel Photonic Clock and Carrier Recovery Device
In high-speed fiber-optic communications systems, the ability to recover the clock from the incoming random data is essential. The recovered clock must be in precise synchronism with the incoming data and is used in further signal processing systems, such as regenerative repeaters, time division switching systems, and demultiplexers. A high-speed photonic clock regenerator is described.
Performance of Residual Carrier Array Feed Combining in Correlated Noise
An array feed combining system for the recovery of SNR loss due to antenna reflector deformation has been implemented and is currently being evaluated on the Jet Propulsion Laboratory 34 meter DSS-13 antenna. In this system, the defocused signal field captured by a focal plane array feed is recovered using real-time signal processing and signal combining techniques. The current signal processing and signal combining algorithms are optimum under the assumption that the white Gaussian noise processes in the received signals from different array elements are mutually uncorrelated. Experimental data at DSS-13 indicate that these noise processes are indeed mutually correlated. The main result of this paper is an analytical derivation of the actual SNR performance of the current suboptimal signal combining algorithm in this correlated noises environment. The analysis here shows that the combined signal SNR can either be improved or degraded depending on the relation between the array signal and noise correlation coefficient phases. Further performance improvement will require the development of signal combining methods that take into account the correlated noises.
Increased drift carrier lifetime in semiconducting boron carbides deposited by plasma enhanced chemical vapor deposition from carboranes and benzene
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Are the carriers of diffuse interstellar bands and extended red emission the same?
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A. CARRIER TRANSIT TIME MEASUREMENT IN SELENIUM. B. LIUMOGEN, SODIUM SALICYLATE. C. LUMINESCENCE OF ALKALI HALIDES.
Liumogen and recent work on sodium salicylate
SPACE CARRIER VEHICLE FIRING HISTORIES
Space science - launch vehicle firing histories
MANRATING SPACE CARRIER VEHICLES
Manned spacecraft launch vehicle suitability - mercury-redstone project - jupiter c - space science
Effect of 40-mev protons on semiconductors as determined with an improved method of measuring diffusion length of minority carriers
Radiation induced changes in semiconductor materials from 40 MeV proton radiation determined by improved infrared method
Laboratory pulse modulator uses minority carrier storage diodes
Pulse modulator is capable of continuously variable pulse width over a 10 to 1 range of 1.0 microsecond to 0.1 microsecond and operates over a wide range of pulse repetition rates. Pulse width diversity is obtained by operating step-recovery diodes in the reverse conduction mode.
Hydrogen - The carrier of life
Hydrogen, and hydrogen compounds with oxygen, carbon, nitrogen, and phosphorus in construction of living systems
A proposed spacecraft-to-earth communications link - the unified carrier approach
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Optically induced free-carrier light modulator
Gallium arsenide laser modulator, attenuation coefficients, and semiconductors for optical communication systems
ATS SSB AFC carrier offset study Final report, 13 Apr. - 27 Jul. 1966
Range of Applications Technology Satellite Single Sideband Automatic Frequency Control /ATS SSB AFC/
Effects of impurities on carrier lifetime in bulk solar-cell material Quarterly report
Lifetime degradation in silicon irradiated with electrons
Use of superconducting cavities to resolve carrier trapping effects in CdS.
Superconducting cavities for resolving optically induced changes in dielectric constant of CdS at 4.2 K