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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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At least 307 records · Page 17

All sources NASA NTRS DOE OSTI

NASA NTRS1969

Linear phase detection using frequency- modulation dedulation techniques

Linear phase detection using FM demodulation for Apollo S band communication system eliminating baseband voice interference with telemetry

Arndt, G. D.↗

NASA NTRS1969

Reducing Apollo backup voice-telemetry data interference using a phase feedback detection process

Phase feedback demodulation technique to analyze telemetry performance degradation caused by voice interference in modes of Apollo communication system, providing linear detection scheme

Panneton, R. J.↗

NASA NTRS1969

Optimization of the frequency locked loop

Frequency locked loop optimization, showing advantages in frequency shift keying detection and FM signal demodulation

Clarke, K. K.↗

NASA NTRS1969

Threshold extension techniques using impulse noise elimination

Threshold extension techniques using impulse noise detection and elimination implemented at phase lock loop demodulator output

Loch, F. J.↗

NASA NTRS1970

An algorithm for telemetry decommutation using Bayesian decisions

Telemetry decommutation algorithm for applying Bayesian decisions to demodulated received bits data

Christensen, C. S.↗

NASA NTRS1970

A delta modulation threshold extension technique for frequency modulation systems

Delta modulation threshold extension technique for phase lock loop FM demodulator

Arndt, G. D.↗

NASA NTRS1970

Phase lock loop acquisition of an angle modulated carrier

Angle modulated carrier acquisition and demodulation, developing baseband model for behavior of output signal from phase lock loop

Carden, F. F.↗

NASA NTRS1970

Correlation detection of impulse noise for FM threshold extension

FM demodulation threshold extension by correlation detection implemented in impulse noise cancellation system

Arndt, G. D.↗

NASA NTRS1970

A comparative analysis of frequency modulation threshold extension techniques

FM threshold extension for system performance improvement, comparing impulse noise elimination, correlation detection and delta modulation signal processing techniques implemented at demodulator output

Arndt, G. D.↗

NASA NTRS1970

The performance of suppressed carrier tracking loops in the presence of frequency detuning

Coherent reference for demodulating double sideband suppressed carrier /DSB-SC/ signals in presence of frequency detuning, using squaring or Costas loop

Lindsey, W. C.↗

NASA NTRS1971

Electronic device increases threshold sensitivity and removes noise from FM communications receiver

Threshold extension device connected between demodulator output and filter output minimizes clicking noise. Device consists of click-eliminating signal transfer channel with follow-and-hold circuit and detector for sensing click impulses. Final output consists of signal plus low level noise without high amplitude impulses.

Conrad, W. M.↗

NASA NTRS1971

Digital decoder for phase-delay coded data

Coded or modulated digital data converts to nonreturn to zero /NRZ/ data. Technique includes logic implementation and pertinent timing diagrams. Demodulation to NRZ facilitates digital logic operations on incoming data. Phase-delay modulation has advantage of inherent self-timing not present in NRZ modulation.

Lewin, J.↗

NASA NTRS1969