Design and performance of block-coded communication systems.
Block coded frequency multiplexed PM COMMUNICATION system design and performance, considering simplification, cost and weight
COMMUNICATIONS SATELLITE↗
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Results for “PHASE LOCK”
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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Method of reducing time base error in digital magnetic recorders
Apparatus reduces Time Base Error /TBE/ in the playback of digital data from magnetic recording equipment. The apparatus uses a magnet which employs a servo position control of the tape by which the playback data clock is phase locked with a fixed frequency reference signal.
Moore, J. M.↗
Theoretical and experimental studies of sub-optimal second and third generation self-adaptive binary communication systems Semiannual report, 1 Jul. - 31 Dec. 1967
Frequency selective fading, analog and digital communication, phase lock loop system, source encoding, bit timing, and other studies on suboptimal self-adaptive binary communication
Lindenlaub, J. C.↗
A space communications study Progress report, 15 Sep. 1967 - 15 Mar. 1968
Threshold performance of phase locked loop demodulators, equivalence of frequency modulated threshold extension receivers, and frequency modulation multipath interference
Clarke, K. K.↗
Study of GSFC radio frequency interference design guideline for aerospace communications systems Final report
Tracking errors caused by radio frequency interference to Minitrack system, and analysis of phase locked loop with interference
Source record↗
Equivalence of FM threshold extension receivers.
FM threshold extension receivers equivalence, demonstrating phase locked loop /PLL/ and frequency locked loop /FLL/ as limiting forms of frequency demodulator with feedback /FMFB/
Hess, D. T.↗
One hundred MHz voltage-controlled oscillator
Voltage controlled oscillator /VCXO/ generates a center frequency of 100 MHz with low phase noise. VCXOs at this and lower frequencies are applied to phase-lock-loop detection systems used in tracking receivers and telemetry systems.
Sward, A. V., Jr.↗
New passive telemetry system
Passive telemetry system enables the monitoring of vital biological functions from living organisms, without external connections or power sources. The FM system, using a phase locked loop technique, keeps the information frequency and powering frequencies separate.
Visscher, J.↗
A method for reducing sampling jitter in digital control systems
Digital phase lock loop system is designed by smoothing the proportional control with a low pass filter. This method does not significantly affect the loop dynamics when the smoothing filter bandwidth is wide compared to loop bandwidth.
Anderson, T. O.↗
Wide-band doubler and sine wave quadrature generator
Phase-locked loop with photoresistive control, which provides both sine and cosine outputs for subcarrier demodulation, serves as a telemetry demodulator signal conditioner with a second harmonic signal for synchronization with the locally generated code.
Crow, R. B.↗
Design for a Rapid Automatic Sync Acquisition System
System provides rapid command sync acquisition between widely separated transmitter-receivers. It is based on a rapid, automatic range-adjustment approach rather than the time-consuming cycle slipping or stepping techniques of conventional phase-locked loops.
Anderson, T. O.↗
Telecommunications Division
Spacecraft telecommunication systems - coding methods for phase locked loops, absolute time determination by pulsar, communications elements research
Source record↗
Advanced study of video signal processing in low signal to noise environments Semiannual progress report, 1967 - 1968
Parameter space calculation for phase lock loop operation in low signal to noise environment
Carden, F. F.↗
Coding and synchronization - The signal design problem.
Synchronization in coded communication systems, considering phase lock loop and square wave correlation function
Stiffler, J. J.↗
Block coding for space communications.
Block coded telemetry systems design for phase coherent space communication employing double conversion superheterodyne phase locked receivers
Lindsey, W. C.↗
Radio frequency baseband recording technique
Technique uses a helical-scan video recorder with auxiliary signal-conditioning equipment to provide an inexpensive, high-capacity magnetic tape recording of a 112 channel, phase-locked, multiplexed, baseband signal.
Heckman, D. C.↗
Block-coded communications
Theory for block-coded telemetry systems is useful in testing performance of one- and two-way, phase-coherent telemetry systems when double-conversion, superheterodyne, phase-locked receiver, preceded by bandpass limiter is used to track carrier.
Lindsey, W. C.↗
Wide-range tracking oscillator generates phase and frequency coherent output
Tracking oscillator consists of modified phase-lock loop which controls voltage-controlled oscillator capable of automatic lock-on and track of periodic input waveform over frequency ratio 500-1. It is used in telemetry and communications systems where large signal fluctuations are encountered.
Howard, J. R.↗