A proposed spacecraft-to-earth communications link - the unified carrier approach.
Unified carrier, range tracking and communications system using phase-locked loop techniques for coherent spacecraft-to-Earth communications
PHASE LOCK↗
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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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Compatibility and performance testing of communications systems.
Apollo communications system testing program for component compatibility and performance, illustrating PCM telemetry system
PULSE CODE MODULATION /PCM/↗
A redundant low power PCM telemeter for the orbiting solar observatory
Redundant low power PCM telemeter for OSO
OSO↗
Spectral analysis applied to a digitally coded PM RF carrier
Spectral analysis applied to digitally coded phase modulated radio frequency carrier
DIGITAL TECHNIQUE↗
Feasibility breadboard of an all-magnetic PCM telemetry system
Feasibility breadboard of all magnetic PCM TELEMETRY system
TELEMETRY↗
PCM picture transmission.
PCM picture transmission, pseudorandom scanning, noise, bandwidth compression and digital simulation
BANDWIDTH↗
Useful approximations to optimum quantization.
Approximation techniques for determination of optimum uniform or nonuniform quantizer
PULSE CODE MODULATION /PCM/↗
On signal and noise level estimation in a coherent PCM channel.
Joint maximum likelihood estimator for signal amplitude and noise power density in coherent PCM CHANNEL with white Gaussian noise
SIGNAL ANALYSIS↗
Burst retransmission of PCM telemetry data.
Periodic burst technique for real-time retransmission of data from multiple asynchronous PCM telemetry links, providing accurate determination of individual sample time
DATA TRANSMISSION↗
Operations programming
Algorithm for recovery of pulse code telemetry data, and simulation program to determine matrix characteristics
TELEMETRY↗
PSK subcarrier demodulators for data acquisition
Pulse code modulation/phase-shift keying subcarrier demodulator for data acquisition
DATA ACQUISITION↗
A spacecraft microelectronic PCM multiplexer- encoder.
Ninety-eight-channel microelectronic PCM MULTIPLEXER-ENCODER design and development qualified to Apollo spacecraft environments
MULTIPLEX TRANSMISSION↗
A hybrid PCM telemetry system for the Nimbus B spacecraft.
PCM telemetry unit for Nimbus B spacecraft noting applications and performance
SATELLITE INSTRUMENTATION↗
Deep-space optical communications.
Communications requirements for manned deep space missions, using optical links, with PPM, PCM/PL AND coherent reception for each link
PULSE CODE MODULATION /PCM/↗
The biasing effect of random bit errors on binary telemetry data.
Bias due to random bit errors that occur in PCM DATA during phases of operation of telemetry data processing system
BINARY DATA↗
Design considerations in PCM transmission of low-resolution monochrome still pictures.
Picture quality in PCM transmission of low resolution monochrome still pictures as affected by system parameter changes
DATA TRANSMISSION↗
An 8 bit, biorthogonal telemetry system with efficient and flexible sync for space communications.
Biorthogonal coded telemetry system for deep space applications, discussing construction and performance
SPACE COMMUNICATION↗
A Data Handling System for Phase Coherent Coded PCM Communications.
Data handling system for 8-bit phase-coherent biorthogonal coded PCM telemeter
PULSE CODE MODULATION /PCM/↗