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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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Threshold performance of phase locked loop demodulators, equivalence of frequency modulated threshold extension receivers, and frequency modulation multipath interference
Multiple purpose inverter design based on phase demodulated inverter circuit selected from state-of-the-art assessment of ten inverter circuits
Demodulators for analog communication over slowly time varying, frequency selective fading channels
Coherent subcarrier reference signal generation for received signal demodulation, discussing error probabilities in telemetry space communication systems design
FM threshold extension receivers equivalence, demonstrating phase locked loop /PLL/ and frequency locked loop /FLL/ as limiting forms of frequency demodulator with feedback /FMFB/
Multifunctional oscilloscope probe incorporates required electronic components so that any one of three desired functions /direct, demodulation, or low capitance/ can be switched into the oscilloscope. The probe obviates the need for the three seperate oscilloscope probes previously used in checking electronic equipment.
Phase-locked-loop phase modulator has the capability of generating a 6.8MHz carrier at modulation indexes as high as 2.5, with a distortion of the demodulated signal of less than 5 percent. These characteristics are obtained without the use of multipliers.
Coherent demodulation in single and double side bands with frequency modulation telemetry systems
Telemetry data unit to form multibit words for use between demodulator and computer
Harmonic distortion in frequency demodulator using feedback, delta modulation, recursive signal processing techniques, and multipath fading
Tradeoff between Doppler measurement capability and subcarrier demodulation in coherent digital communication system quantitatively presented for various SNR
Phase-lock loop demodulator ability to acquire and remain locked on signal under noise and pulse interference
Communications system maintains phase lock of weak telemetry signals with a minimal expenditure of power and bandwidth. An estimate of the frequency variation as a function of time is used to achieve coherent phase demodulation.
Telemetry package uses three separate FM/AM transmitters, one for each axis of measurement. Three AM receivers and a tape recorder are used for receiving, demodulating, and recording the acceleration signal.
Demodulation process for AM baseband telemetry systems
All digital phase locked loop FM demodulator, and optimum adaptive delta modulator designed for improving space communication
Coherent demodulation in double sideband frequency modulation telemetry system
Design study for optimal nonlinear receiver demodulator