Probability distribution of time to phase lock for a second-order phase-locked loop.
Probability distribution of time required for second order phase locked loop to achieve phase lock following step function perturbation
Keblawi, F. S.↗
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Phase-locked-loop phase modulator with high modulation index, low distortion
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.
Badstiibner, C. G.↗
Experimental results for phase-lock loop systems having a modified nth-order tanlock phase detector.
Lock range and threshold defined, presenting experimental results for phase lock loop systems having modified nth order tanlock phase detector
Lindenlaub, J. C.↗
Estimation of gamma phase composition in nickel-base superalloys /based on geometric analysis of a four-component phase diagram/
Estimation of gamma phase composition in nickel base heat resistant alloys based on analysis of quaternary phase diagrams
Dreshfield, R. L.↗
Phase interpolation circuits for scanning phased arrays
Phase interpolation circuits for scanning phased arrays
Caron, P. R.↗
A class of phase-interpolation circuits for scanning phased arrays
Phase interpolation circuits for scanning phased array antennas, using doublers and frequency multipliers
Caron, P. R.↗
Bi-polar phase detector and corrector for split phase PCM data signals Patent
Bipolar phase detector and corrector for split phase PCM data signals
Bailey, J. W.↗
Phase demodulation system with two phase locked loops Patent
Development of phase demodulation system with two phase locked loops
Hudspeth, T.↗
Analysis of a hybrid phase-locked loop for improved phase estimation
Digital communication hybrid phase locked loop nonlinear feedback system with modulation and carrier components enhancing phase estimation
Stewart, T. L.↗
Simplified formula for mean cycle-slip time of phase-locked loops with steady-state phase error.
Previous work shows that the mean time from lock to a slipped cycle of a phase-locked loop is given by a certain double integral. Accurate numerical evaluation of this formula for the second-order loop is extremely vexing because the difference between exponentially large quantities is involved. The presented article demonstrates a method in which a much-reduced precision program can be used to obtain the mean first-cycle slip time for a loop of arbitrary degree tracking at a specified SNR and steady-state phase error. It also presents a simple approximate formula that is asymptotically tight at higher loop SNR.
Tausworthe, R. C.↗
Phase jitter in a differential phase experiment.
Austin (1971) had concluded that, because of the 'phase jitter,' the differential phase experiment is useful over a more limited height range than the differential absorption experiment. Several observations are presented to show that this conclusion is premature. It is pointed out that the logical basis of the differential absorption experiment also requires that the O- and X-mode echoes, at a given time, come from the same irregularities. Austin's calculations are believed to contain a systematic error above 80 km.
Tanenbaum, B. S.↗
Phased-array antenna phase control circuit using frequency multiplication
Circuit separates out, from multiplied signals, antenna element signals which have desirable phase angles and feeds them to appropriate antenna elements of phased array. System may be used in either transmitting or receiving mode.
Mailloux, R. J.↗
Phase 2 design study of the electronic assembly for the HRUV spectrometer/polarimeter intended for the solar maximum mission. Implementation phase program plan, revision A
The primary function of the implementation phase is to convert the ERA design of the design study phase into deliverable flight hardware. The development aspects of the experiment logic unit, the dual power converter, the junction box and the cables are considered.
Source record↗
Effects of gravity reduction on phase equilibria. Part 2: Binary two-phase solids
Phase diagrams for two-phase solids and eutectic, monotectic, peritectic, and syntectic reactions in low gravity applications to processes and products are considered.
Larson, D. J., Jr.↗
Phase Length Optical Phase-Locked-Loop Sensor
The invention is a device that provides a high resolution measurement of the change in optical phase length from the device optical system source to an optical reflector. The invention consists of a optical phase locked loop that uses a laser beam as a carrier of an intensity modulated energy source. The novelty of the invention appears to lie in the overall combination of elements which provide high resolution without loss of wide dynamic range. The invention does not depend on coherent reflection from a target, and thus can measure targets that do not have special preparation or corner reflectors. The use of carrier modulation achieves high resolution without the problems of high speed pulse duration systems. Thus the invention has the advantages of simplicity, low cost, and small size without sacrificing resolution.
Heyman, Joseph S.↗
A digitally implemented phase-locked loop detection scheme for analysis of the phase and power stability of a calibration tone
A digital phase-locked loop (PLL) scheme is described which detects the phase and power of a high SNR calibration tone. The digital PLL is implemented in software directly from the given description. It was used to evaluate the stability of the Goldstone Deep Space Station open loop receivers for Radio Science. Included is a derivative of the Allan variance sensitivity of the PLL imposed by additive white Gaussian noise; a lower limit is placed on the carrier frequency.
Densmore, A. C.↗
Phase equilibria and liquid phase epitaxy growth of PbSnSeTe lattice matched to PbSe
The necessary phase diagram data for growing lattice-matched layers of PbSnSeTe on PbSe are presented. Solid compounds of Pb(1-x)Sn(x)Se(1-y)Te(y) lattice-matched to PbSe were grown from liquid melts consisting of (Pb/1-x/Sn/x/)(1-z)(Se/1-y/Te/y/)(z); phase equilibria data were determined together with liquidus data for values of x(liquid) from 0 to 40 percent and y(liquid) from 0 to 40 percent for temperatures between 450 and 540 C. It was found that relatively large amounts of Te must be added to the melt to achieve lattice matching because of its low segregation coefficient relative to Se. A significant lattice-pulling effect was discovered for the 5-percent Sn case, and a similar effect is expected for the 10- and 20-percent Sn cases.
Mccann, Patrick J.↗
In-Space technology experiments program. A high efficiency thermal interface (using condensation heat transfer) between a 2-phase fluid loop and heatpipe radiator: Experiment definition phase
Space Station elements and advanced military spacecraft will require rejection of tens of kilowatts of waste heat. Large space radiators and two-phase heat transport loops will be required. To minimize radiator size and weight, it is critical to minimize the temperature drop between the heat source and sink. Under an Air Force contract, a unique, high-performance heat exchanger is developed for coupling the radiator to the transport loop. Since fluid flow through the heat exchanger is driven by capillary forces which are easily dominated by gravity forces in ground testing, it is necessary to perform microgravity thermal testing to verify the design. This contract consists of an experiment definition phase leading to a preliminary design and cost estimate for a shuttle-based flight experiment of this heat exchanger design. This program will utilize modified hardware from a ground test program for the heat exchanger.
Pohner, John A.↗