A survey of discrete Kalman-Bucy filtering with unknown noise covariances
Discrete Kalman-Bucy linear filtering with inaccurate noise covariances, considering optimal and suboptimal systems, error analysis, probability theory, etc
Weiss, I. M.↗
SEARCH · Engineering Papers
Results for “Error analysis”
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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State estimation errors in navigational state estimation problem Quarterly progress report, 1 Feb. - 1 May 1969
Orbital position estimation error analysis and earth orbital mission simulation
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Technique for measuring time-base errors of magnetic instrumentation recorders/reproducers
Time-base error analysis of magnetically recorded and played back digital data using tape flutter spectral density and amplitude probability distribution measurements and rms time plots
Chan, R. J.↗
Effects of payoff on detection in a symmetric auditory detection task
Signal detection payoff in symmetrical auditory task, studying effect on rates and error analysis
Calfee, R. C.↗
Operating noise-temperature calibrations of low-noise receiving systems
Deep Space Communications System low noise microwave receiver, discussing operating noise temperature calibration, error analysis and programming
Stelzried, C. T.↗
Results and interpretation of the S-band occultation experiments on Mars and Venus
Mariner S-band occultation experimental data compared with theory for accuracy of physical characteristics of Mars and Venus atmosphere, reviewing data reduction and error analysis
Rasool, S. I.↗
An analytic model of eclipsing binary star systems
Analytical model of eclipsing binary star systems, testing validity through numerical integration error analysis
Wood, D. B.↗
Significance arithmetic experimental package (SIGPAC)
Method for use by computing facility to determine accuracy of computer calculations is presented. Primary goals of error analysis program are described. Program is designed for both FORTRAN 4 and ASSEMBLER for use with IBM 360 computer.
Cole, I.↗
Advanced study of global oceanographic requirements for EOS A/B: Appendix volume
Tables and graphs are presented for a review of oceanographic studies using satellite-borne instruments. The topics considered include sensor requirements, error analysis for wind determination from glitter pattern measurements, coverage frequency plots, ground station rise and set times, a technique for reduction and analysis of ocean spectral data, rationale for the selection of a 2 PM descending orbit, and a priority analysis.
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Inertial navigation system using three TDF gyroscopic sensors not jointly mounted on a stable platform
An inertial navigation system is described and analyzed based on two two-degree-of-freedom Schuler-gyropendulums and one two-degree-of-freedom azimuth gyro. The three sensors, each base motion isolated about its two input axes, are mounted on a common base, strapped down to the vehicle. The up and down pointing spin vectors of the two properly tuned gyropendulums track the vertical and indicate physically their velocity with respect to inertial space. The spin vector of the azimuth gyro is pointing northerly parallel to the earth axis. The system can be made self-aligning on a stationary base. If external measurements for the north direction and the vertical are available, initial disturbance torques can be measured and easily biased out. The error analysis shows that the system is practicable with today's technology.
Stieler, B.↗
STADAN antenna gain calibration using radio stars
An antenna gain measurement method was developed which utilizes a signal emitted from a radio star to determine absolute antenna gain at 136 MHz and 400 MHz for antennas in the STADAN network. An error analysis of the radio star method shows that the overall standard deviation uncertainty in antenna gain is + or - 0.6 db (1 sigma).
Taylor, R. E.↗
Advanced communication system time domain modeling techniques ASYSTD software description. Volume 2: Program support documentation
The theoretical basis for the ASYSTD program is discussed in detail. In addition, the extensive bibliography given in this document illustrates some of the extensive work accomplished in the area of time domain simulation. Additions have been in the areas of modeling and language program enhancements, orthogonal transform modeling, error analysis, general filter models, BER measurements, etc. Several models have been developed which utilize the COMSAT generated orthogonal transform algorithms.
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Reply to a paper on the use of two magnetometers for magnetic field measurements on a spacecraft
The use of two magnetometers for measuring the ambient magnetic field of spacecraft is compared with the single magnetometer variance method. It is shown that the dual magnetometer concept was developed for missions which are conducted with attitude stabilized spacecraft which have been constructed without an adequate magnetics control program. Specific methods for applying the dual magnetometer technique are described and an error analysis is conducted to determine the accuracy of the results.
Ness, N. F.↗
Comparative cut-bar thermal conductivity apparatus.
Construction details, error analysis, and typical data for a rapid comparative device for thermal conductivity measurements are presented. The apparatus consists of a comparative cut-bar arrangement contained in a bell-jar. The cylinder shaped specimen is placed between two ARMCO-iron meter bars of the same diameter. The upper bar is equipped with a heater, while the lower one is terminated in a heat sink. The temperature gradient along the bars is measured with a series of copper/constantan microthermocouples, spot welded to them. The assembly is held together by loading the bars to a desired pressure, via a pneumatic cylinder. Contact resistance at the boundaries between the specimen and the meter bars is minimized by using a Hg/In/Ga alloy film at the interface and sufficient loading force. The gradients determined for the meter bars then may be extrapolated to the boundaries yielding the temperature drop along the specimen. Using two different length specimens, the magnitude of the temperature drop across the interface can be computed, or the true gradient along the specimen can be obtained from the difference in overall temperature drops and lengths.
Gaal, P. S.↗
Photographic and photometric enhancement of Lunar Orbiter products, projects A, B and C
A detailed discussion is presented of the framelet joining, photometric data improvement, and statistical error analysis. The Lunar Orbiter film handling system, readout system, and the digitization are described, along with the technique of joining adjacent framelets by a using a digital computer. Time and cost estimates are given. The problems and techniques involved in improving the digitized data are discussed. It was found that spectacular improvements are possible. Program documentations are included.
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Interior radiances in optically deep absorbing media. 1: Exact solutions for one-dimensional model
The exact solutions are obtained for a one dimensional model of a scattering and absorbing medium. The results are given for both the reflected and transmitted radiance for any arbitrary surface albedo as well as for the interior radiance. These same quantities are calculated by the matrix operator method. The relative error of the solutions is obtained by comparison with the exact solutions as well as by an error analysis of the equations. The importance of an accurate starting value for the reflection and transmission operators is shown. A fourth order Runge-Kutta method can be used to solve the differential equations satisfied by these operators in order to obtain such accurate starting values.
Kattawar, G. W.↗
Meteorological measurements from satellite platforms
Quantitative exploitation of meteorological data from geosynchronous satellites is starting to move from the laboratory to operational practice. Investigations of the data applications portion of the total meteorological satellite system include: (1) tropospheric wind shear and the related severe storm circulations; (2) kinematic properties of the tropical atmosphere as derived from cloud motion vectors; (3) application of a geostationary satellite rake system to measurements of rainfall; and (4) pointing error analysis of geosynchronous satellites.
Suomi, V. E.↗
On-board processing for data collection satellite systems
The research and results for the specific tasks of this program are summarized. The proposed tasks and status discussed include: Coarse frequency measurement, fine frequency measurement, message format design, data reduction, and system error analysis.
Cooper, G. R.↗