SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
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.
Stepping drive has been designed for precise incremental angular positioning of scale models of spacecraft about a horizontal axis in order to accurately measure antenna receiving and transmitting characteristics. Positioning is insured by spring-loaded, self-locking plungers.
Frequency selective fading, analog and digital communication, phase lock loop system, source encoding, bit timing, and other studies on suboptimal self-adaptive binary communication
Threshold performance of phase locked loop demodulators, equivalence of frequency modulated threshold extension receivers, and frequency modulation multipath interference
Tracking errors caused by radio frequency interference to Minitrack system, and analysis of phase locked loop with interference
Expandable air lock experiment for orbital flight testing on S-4B Workshop - technical evaluation
Multiple-mission telemetry system - bit-sync lock detector evaluation
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.
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.
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.
Special tool removes quick-locking fasteners incorporating waffle-spring retaining washers without damage.
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.
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.
Frequency modulated feedback system and frequency locked loop system for space communications
Spacecraft telecommunication systems - coding methods for phase locked loops, absolute time determination by pulsar, communications elements research
Parameter space calculation for phase lock loop operation in low signal to noise environment
Synchronization in coded communication systems, considering phase lock loop and square wave correlation function
AC technique using lock-in power amplifier SNR for measuring galvanomagnetic and Shubnikov-de Haas effects, noting error reduction