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.↗
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Digital transition tracking symbol synchronizer for low SNR coded systems.
Digital transition tracking symbol synchronizer for low SNR coded telemetry systems, discussing phase locked loop analysis and phase detector simulation by Monte Carlo method
Anderson, T. O.↗
Telemetry receiver
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.
Gilchriest, 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.↗
Improved quick-disconnect electrical connector
Electrical connector is fitted with an O ring, moisture-proof seal, is shielded in both the mated and unmated positions, and is equipped with one keying and three locking spheres.
Horton, R. F.↗
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.↗
Jettisoning system for a parachute's canister
Three-point automatically released suspension and jettisoning system operates independently of lander's power system and releases parachute on touchdown. The system is based on a ball-lock device operated by the shock of the parachute's opening and by the subsequent decay in the load on the main cord.
Lonborg, J. O.↗
Flexible or rigid extending arm
One motion of a manual clamp makes a universally flexible arm instantly rigid in any configuration. Device is locked rigid by meshing of gear teeth, providing great resistance to loading.
Siebert, C. J.↗
Spectral analysis of oscillation instabilities in frequency standards
Phase and frequency fluctuations, inherent in oscillators used as frequency standards, are measured over spectral frequency range of 1 Hz to 5 kHz. Basic measurement system consists of electromechanical phase-locked loop that extracts phase and frequency fluctuations and error multiplier that extends threshold sensitivity.
Lippincott, S.↗
Study of applications of retrodirective and self-adaptive electromagnetic wave phase controls to a Mars probe, part 2 Final report, 26 Jan. - 31 Dec. 1967
Phase-locked loop operation in multipath environment and multipath effect on detection for Mars probe
Bershad, N. J.↗
Optimal space communications techniques Status report, 16 Dec. 1969 - 15 Mar. 1970
All digital phase locked loop FM demodulator, and optimum adaptive delta modulator designed for improving space communication
Schilling, D. L.↗
Performance improvement analysis for the Apollo unified S-band system Semiannual progress report
Performance improvement analysis for Apollo unified S band system, including computerized simulation techniques and phase lock loop studies
Shelton, R. D.↗
Reflected third harmonic generated by picosecond laser pulses
Third harmonic generation detection for strongly absorbing media in reflection with neodymium-glass mode-locked laser, measuring nonlinear susceptibilities of semiconductors and metals
Bloembergen, N.↗
Observation of radiation from nonlinear polarization sideband in argon lasers
Radiation from nonlinear polarization sideband in Ar lasers, discussing anomalous beat notes and mode locking phenomena
Demars, G. A.↗
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.↗
Transient stimulated rotational and vibrational Raman scattering in gases
Transient stimulated rotational and vibrational Raman scattering in gases using mode locked ruby laser
Bloembergen, N.↗
Wide-band high-resolution determination of absolute frequency
Absolute frequency wideband high resolution determination, using frequency synthesizer as phase locked loop local oscillator
Farthing, W. H.↗
Thermal and tidal effect on the rotation of Mercury
Thermal tidal friction and gravitation effects on Mercury libration after solidification, noting equilibrium with orbital and rotational periods locked in 3/2 resonant state
Liu, H.-S.↗