Alignment processing techniques for strapdown inertial guidance systems.
Statistical methods for alignment processing of strapdown inertial guidance systems
Farrell, E.↗
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Estimation of signal-to-noise ratios
Statistical method estimates signal-to-noise ratios in an observed random voltage, such as the output of a telemetry receiver. Signals from a distant transmitting source, overlaid by noise signals, are monitored continuously.
Couvillon, L. A., Jr.↗
A simple technique for automatic computer editing of biodata
Statistical method for automatic computer editing of biological data
Lewis, C. E., Jr.↗
The X sup 2 statistic and the goodness of fit test
Statistical method for evaluating goodness of fit between data set and theoretical distribution of random variables
Argentiero, P. D.↗
Optical probing of supersonic aerodynamic turbulence
Laser quasi-schlieren system and laser shadow-correlation system retrieve flow-related signals sufficient for computing accurate, reproducible correlation peaks. Statistical method for obtaining one-shot measurements of the decay history of turbulent structures in a stationary frame of reference is discussed.
Cikanek, H. A., Jr.↗
Introduction to trajectory estimation for RTCC programmers
Statistical method for estimating position and velocity of spacecraft
Rich, R. G.↗
Reliability testing and demonstration session 3-B
Statistical method in reliability tests including confidence limits for normal, lognormal, and binomial functions
Lalli, V.↗
An efficiency evaluation of the ATS-3 hydrazine orbit control system
ATS-3 hydrazine orbit control system efficiency evaluation statistical method, considering stationkeeping maneuvers
Greene, R. H.↗
Statistical characterization of phenolic-novolak structures
Three statistical methods of general validity are valuable for characterizing any polymer which results from chain polymerization of multifunctional branching monomers linked through bifunctional monomers.
Parker, J. A.↗
A linguistic approach to telemetry decommutation
Telemetry decommutation system using linguistic and statistical methods in pattern recognition
Kulick, J. H.↗
Automatic processing of multispectral observations
Statistical methods for inventory boundary determination and data compression in automatic processing of multispectral scanner remote sensor earth observations from aircraft and spacecraft
Krause, F. R.↗
The application of signal detection theory to optics
The restoration of images focused on a photosensitive surface is treated from the standpoint of maximum likelihood estimation, taking into account the Poisson distributions of the observed data, which are the numbers of photoelectrons from various elements of the surface. A detector of an image focused on such a surface utilizes a certain linear combination of those numbers as the optimum detection statistic. Methods for calculating the false alarm and detection probabilities are proposed. It is shown that measuring noncommuting observables in an ideal quantum receiver cannot yield a lower Bayes cost than that attainable by a system measuring only commuting observables.
Helstrom, C. W.↗
Structural model optimization using statistical evaluation
The results of research in applying statistical methods to the problem of structural dynamic system identification are presented. The study is in three parts: a review of previous approaches by other researchers, a development of various linear estimators which might find application, and the design and development of a computer program which uses a Bayesian estimator. The method is tried on two models and is successful where the predicted stiffness matrix is a proper model, e.g., a bending beam is represented by a bending model. Difficulties are encountered when the model concept varies. There is also evidence that nonlinearity must be handled properly to speed the convergence.
Collins, J. D.↗
Evaluation of electroexplosive devices by nondestructive test techniques and impulsive waveform firings
Special requirements of the space industry for more detailed knowledge of the quality and reliability of each electroexplosive device (EED) selected for use aboard a spacecraft are described. Statistical methods do not practically demonstrate the high reliability needed. To close this gap, nondestructive test techniques and instrumentation for 1-W/1-A no-fire devices have been developed. Several lots of squibs have been evaluated using these techniques and instrumentation. They yield data as to the quality and normal behavior of each electroexplosive device without firing or degrading the unit. Performance data were obtained by initiating the EED's with an impulsive waveform and sensing the initiation characteristics, sensitivity, and output.
Menichelli, V. J.↗
Application of the QSDC procedure to the formulation of space shuttle design criteria. Volume 1: Study effort
Criteria to determine the probability of aircraft structural failure were statistically established according to the Quantitative Structural Design Criteria by Statistical Methods, the QSDC procedure. Since an Application Guide is needed to use the QSDC procedure, most of the study was directed to the development of this guide. Most of the considerations followed in the development of the Applications Guide and the Guide itself are reported.
Bouton, I.↗
Application of the QSDC procedure to the formulation of space shuttle design criteria. Volume 2: Applications guide
Criteria to determine the probability of aircraft structural failure were established according to the Quantitative Structural Design Criteria by Statistical Methods, the QSDC Procedure. This criteria method was applied to the design of the space shuttle during this contract. An Applications Guide was developed to demonstrate the utilization of the QSDC Procedure, with examples of the application to a hypothetical space shuttle illustrating the application to specific design problems. Discussions of the basic parameters of the QSDC Procedure: the Limit and Omega Conditions, and the strength scatter, have been included. Available data pertinent to the estimation of the strength scatter have also been included.
Bouton, I.↗
Molecular configuration and pyrolysis reactions of phenolic-novolaks.
Description of a statistical method for characterizing the structure of an average phenolic-novolak prepolymer molecule in terms of the total number of phenolic nuclei that compose the molecule and the number of these nuclei that are pendent. It is only necessary to resort to experimental pyrolysis to evaluate the thermokinetic parameters for pyrolysis for the ablator. In addition, the fraction of phenolic involved in the major pyrolysis reactions can be estimated in terms of the parameters previously evaluated. It is shown that the overlapping reactions which occur during pyrolysis of a phenolic-novolak can be resolved by pyrolyzing samples with different extents of cure. It is then possible to determine the kinetic parameters for pyrolysis for the major reactions by well-known methods which often fail when reactions are not well resolved.
Winkler, E. L.↗
Indirect sensing of atmospheric temperature and water vapor using microwaves.
A prototype of the Nimbus E microwave spectrometer was flown in an airplane over various atmospheric and surface conditions. Effects of clouds and the terrestrial surface on the data are discussed. Using a multiple-regression statistical method of inverting the equation of radiative transfer, estimates of temperature and integrated contents of water vapor and liquid water in the atmosphere below the aircraft were made from the microwave data obtained at high altitude. These estimates are compared with direct measurements made by other experiments on board the aircraft, in both clear atmospheres and in the presence of clouds.
Rosenkranz, P. W.↗