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Tuesday, May 19, 2020 | History

3 edition of Investigation of dynamic noise affecting geodynamics information in a tethered subsatellite found in the catalog.

Investigation of dynamic noise affecting geodynamics information in a tethered subsatellite

Investigation of dynamic noise affecting geodynamics information in a tethered subsatellite

  • 188 Want to read
  • 38 Currently reading

Published by The Administration in Greenbelt, Md .
Written in English

    Subjects:
  • Thermosphere,
  • Artificial satellites -- Dynamics

  • Edition Notes

    Statementprincipal investigator Gordon E. Gullahorn ; prepared for National Aeronautics and Space Administration
    SeriesNASA-CR -- 173558, NASA contractor report -- 173558
    ContributionsUnited States. National Aeronautics and Space Administration, Smithsonian Astrophysical Observatory
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14928551M

    Inter-noise Page 1 of 8 On the reduction of the engine and aerodynamic noise of aircraft L. M. B. C. CAMPOS1 1 LAETA, (Centro de Ciências e Tecnologias Aeronáuticas e Espaciais – CCTAE), Instituto Superior Técnico (IST), Universidade de Lisboa, Portugal.   Machine learning techniques often have to deal with noisy data, which may affect the accuracy of the resulting data models. Therefore, effectively dealing with noise is a key aspect in supervised learning to obtain reliable models from data. Although several authors have studied the effect of noise for some particular learners, comparisons of its effect among different learners are by:

    No is the noise power density at the output of the network. To understand Equation 9 further, it is assumed that a signal with a power density of Si is input to the system which amplifies it by a power gain of G and adds a certain amount of noise Nx to the input. SLAA–October Signal Chain Noise Figure Analysis 5 Submit Documentation File Size: KB. 30 Noise and Distortion Introduction Noise may be defined as any unwanted signal that interferes with the communication, measurement or processing of an information-bearing signal. Noise is present in various degrees in almost all environments. For example, in a digital cellular mobile telephone system, there may be several.

      1. Introduction. A major contribution to stochasticity in empirical epidemiological data is population noise, which is modelled by time-continuous Markov processes or master equations [1–3].In some cases, the master equation can be analytically solved and from the solution a likelihood function be given [].The likelihood function gives best estimates via maximization or can be used in the Cited by: or ) to minimize noise. Given that noise is the main factor that limits dynamic range in the dark range of val-ues, it is critical to understand how noise can be minimized in high dynamic range (HDR) imaging. In this paper, we undertake a systematic study of noise and reconstruction in HDR imaging and compute the optimal exposure sequence.


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Investigation of dynamic noise affecting geodynamics information in a tethered subsatellite Download PDF EPUB FB2

Get this from a library. Investigation of dynamic noise affecting geodynamics information in a tethered subsatellite: Final report for the period 1 August through 31 July [Gordon E Gullahorn; Smithsonian Astrophysical Observatory.; United States.

National Aeronautics and Space Administration.] -- "Work performed as part of an investigation of noise affecting instrumentation in a. Get this from a library. Investigation of dynamic noise affecting geodynamics information in a tethered subsatellite.

[Gordon E Gullahorn; United States. National Aeronautics and Space Administration.; Smithsonian Astrophysical Observatory.].

The effects of a tethered satellite system's internal dynamics on the subsatellite were calculated including both overall motions (libration and attitude oscillations) and internal tether oscillations.

The SKYHOOK tether simulation program was modified to operate with atmospheric density variations and to output quantities of : G. Gullahorn. Observations from the subsatellite of a tethered satellite system (TSS) would increase sensitivity and resolution due to the low altitude possible.

However, the TSS is a dynamically noisy system and would be perturbed by atmospheric drag : G. Gullahorn. The effects of a tethered satellite system's internal dynamics on the subsatellite were calculated including both overall motions (libration and attitude oscillations) and internal tether oscillations.

The SKYHOOK tether simulation program was modified to operate with atmospheric density variations and to output quantities of interest. The following specific topics were addressed during the reporting period: a method for stabilizing the subsatellite against the rotational effects of atmospheric perturbation was developed; a variety of analytic studies of tether dynamics aimed at elucidating dynamic noise processes were performed; a novel mechanism for coupling longitudinal and latitudinal oscillations of the tether was discovered, and random vibration analysis for modeling the tethered subsatellite.

AFFECTING GEODYNAMICS INFORMATION IN A TETHERED SUSSATELLITE NASA GRANT NAG V INVESTIGATION OF DYNAMIC NOISE.j a FINAL REPORT For the period 1 June through 31 May Principal Investigator Dr.

Gordon E. Gullahorn May Prepared for National Aeronautics and Space Administration Greenbelt, Maryland Smithsonian Institution. Abstract: Explaining four basic types of noise, and by showing the various methods, together with boundary conditions, which can be used to find the worst case noise margins.

A flip-flop setup is advised which can be used for measurements and computer simulations, both for static and dynamic noise margins. Also configurations with fan-in and fan-out larger than 1 can be handled with this flip Cited by: Scott Hromisin, Leighton M.

Myers, Philip J. Morris and Dennis K. McLaughlin The Near-Field Acoustics of Supersonic Single and Dual Impinging Jets with Correlations to Far-Field Noise /Cited by: 2.

This paper describes the current development of a noncryogenic gravity gradiometer for future use on board the tethered satellite system (TSS). The paper also proposes a way of testing a single‐axi Cited by: Dynamic Noise Affecting Geodynamics Instrumentation in a Tethered Subsatellite." During the reporting period, SAO has Continued modeling of the atmospherically induced dynamic noise in the subsatellite through the modification and use of the SKYHOOK program.

- Written and submitted an invited paper for the forthcoming Special Issue on Geodynamics of the IEEE Transactions on.

Abstract: Dynamic noise analysis is greatly needed in place of traditional static noise analysis due to the ever increasingly stringent design requirement for VLSI chips based on very deep submicron process technology. In this paper, we propose complete and self-consistent dynamic noise margin definitions to reduce the pessimism of conventional static noise margin based noise analysis.

Characteristic for Dynamic Noise Analysis,” Proceedings on IEEE Design Automation and Testing Conference in Europe (DATE), May • L. Ding and P. Mazumder, “Dynamic Noise Margin: Definitions and Model,” Proceedings on IEEE International Conference File Size: 1MB.

signal tilne histories, the noise alnplitude probability distribution (APD), noise impulsiveness, and average noise level N•,g at user-specified frequencies. In postprocessing, data collected froin the orthogonal loops can be combined to obtain equivalent vertical electric field strength and an estimate of signal or noise by: 7.

Summary This chapter contains sections titled: Introduction Use and Abuse of Colored Noise Colored Noise Theory Colored Two‐State Noise Colored Noise Theory: Approximation Schemes Colored Noise Cited by: Full text of "Tethers in space handbook, second edition" See other formats.

Aerodynamic noise is generated at both gradual and abrupt changes in duct area. Gradual transitions and low velocities generate less turbulence than abrupt transitions and high velocities. Noise generated in transition elements such as turns, elbows, junctions, and takeoffs can run 10 to 20 dB higher than the sound power levels generated in straight duct runs.

A relatively general mathematical model is proposed for studying the coupled attitude dynamics of space platform supported tethered subsatellite systems accounting for offset of the tether attachment point. The offset is treated as a function of time subject to constraints.

General energy expressions allowing for flexibility of the tether as well as the platform are derived. The governing. Book Description: The growth of aviation and the increasing size and power of aircraft has made aerodynamic noise a major problem.

Control of this noise will only be possible when more is known of its generation, propagation, and attenuation. Noise theory and application to physics investigates a number of ideas about noise and fluctuations in a single book in relation with probability and stochastic processes, information theory, statistical physics and statistical inference.

The different notions are illustrated with many application examples from physics and engineering science. Dennis Fitzpatrick, in Analog Design and Simulation Using OrCAD Capture and PSpice (Second Edition), Abstract. Noise analysis is run in conjunction with an AC analysis, and calculates the output noise and equivalent input noise in a circuit.

The output noise, at a specified output node, is the root mean square sum of the noise generated by all the resistors and semiconductors in the circuit.Full text of "NASA Technical Reports Server (NTRS) Tethers in Space Handbook" See other formats.necting a noise source directly at the input of the instru-ment as shown in Figure 2.

A noise source is a device that emits a known quanti-ty of noise and has 2 states: ON and OFF. During the OFF state, the noise source emits thermal noise corresponding to its ambient or internal temperature.

In the ON state.