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Saturday, August 1, 2020 | History

2 edition of entry plasma sheath and its effects on space vehicle electromagnetic systems. found in the catalog.

entry plasma sheath and its effects on space vehicle electromagnetic systems.

Plasma Sheath Symposium Langley Research Center 1970.

entry plasma sheath and its effects on space vehicle electromagnetic systems.

by Plasma Sheath Symposium Langley Research Center 1970.

  • 202 Want to read
  • 4 Currently reading

Published by Scientific and Technical Information Office, National Aeronautics and Space Administration; [for sale by the National Technical Information Service, Springfield, Va.] in Washington .
Written in English

    Subjects:
  • Plasma sheaths -- Congresses.,
  • Astronautics -- Communication systems -- Congresses.

  • Edition Notes

    Includes bibliographies.

    StatementPrepared by Langley Research Center.
    SeriesNASA SP-252, NASA SP ;, 252, etc.
    ContributionsLangley Research Center.
    Classifications
    LC ClassificationsTL3028 .P53 1970
    The Physical Object
    Paginationv.
    ID Numbers
    Open LibraryOL5739283M
    LC Control Number70611369

    and navigation to hypersonic and space re-entry vehicles has been a problem for over 45 years. The classical radio frequency (RF) blackout results when the associated EM wave is reflected and absorbed by the free electrons that make-up the plasma sheath which envelops the re-entering vehicle. The plasma is. I feel rather certain that current re-entry speeds for man space craft fall betw mph mph. Mach 5 is roughly 3, mph, depending on altitude.

      Abstract: When a hypersonic vehicle reenters the Earth's atmosphere, plasma sheath generated by its collision with ambient air affects the electromagnetic (EM) wave propagation. To understand such effects is very important for the design of communication, telemetry, and satellite navigation systems. In this paper, the transmission coefficient of the plasma sheath is investigated . Plasma, in physics, an electrically conducting medium in which there are roughly equal numbers of positively and negatively charged particles, produced when the atoms in a gas become ionized. It is sometimes referred to as the fourth state of matter, distinct from the solid, liquid, and gaseous states.

      The effects of the plasma sheath can generally be divided into two aspects. As shown in Fig. 1, the static attenuation caused by plasma sheath first increases then decreases with the increasing electromagnetic wave transmission frequency, where the most severe condition occurs near the plasma cutoff frequency [p]. This usually dark boundary region is called plasma sheath. Positive charges in plasma sheath can push more ions to diffuse out of plasma. It also creates a potential barrier to prevent electrons from diffusing out of plasma. Eventually the loss rate of electrons and ions will reach an equilibrium state.


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Entry plasma sheath and its effects on space vehicle electromagnetic systems by Plasma Sheath Symposium Langley Research Center 1970. Download PDF EPUB FB2

[6] Blottner, F. G., “Prediction of Electron Density in the Boundary Layer of Entry Vehicles with Ablation,” The Entry Plasma Sheath and Its Effects on Space Vehicle Electromagnetic Systems, NASA SP, Vol. 1, Oct.pp. – The Entry Plasma Sheath and its Effect on Space Vehicle Electromagnetic Systems.

NASA SP In: The Entry Plasma Sheath and Its Effects on Space Vehicle Electromagnetic Systems, vol. Hampton, Virginia, pp. 3–17 (). NASA Langley Research Center. C.T. Swift, F.B. Beck, et C-III S-Band Diagnostic Experiment: The Entry Plasma Sheath and Its Effects on Space Vehicle Electromagnetic Systems, vol.

1 NASA Langley Research Center, Hampton, Virginia (), pp. Cited by: 4. P. Huber, N. Akey, W. Croswell, C. SwiftThe entry plasma sheath and its effects on space vehicle electromagnetic systems NASA Tech.

Note, (), pp. Google ScholarAuthor: Kai Chen, Degang Xu, Jining Li, Xingning Geng, Kai Zhong, Jianquan Yao.

A plasma sheath enveloping a reentry vehicle would affect performances of on-board antenna greatly, especially the navigation antennas. This paper studies the effects of reentry plasma sheath on a GPS right-hand circularly polarized (RHCP) patch antenna polarization property during a typical reentry process.

Utilizing the algorithm of finite integration technique, the polarization.“ The Removal of Free Electrons in a Thermal Plasma by Means of Rapidly Evaporating Liquid Additives,” The Entry Plasma Sheath and its Effects on Space Vehicle Electromagnetic Systems, Vol.

I, NASA Special Publ. SP,pp. – The effect of intra-pulse modulation on the LFM pulse due to time-varying plasma should be emphasized in the application of the radar and communication systems on a vehicle under a plasma sheath.

View. Akey, N. D., "Overview of RAM reentry measurements program," The Entry Plasma Sheath and Its Effects on Space Vehicle Electromagnetic Systems,4.

Rawhouser, R., Overview of the AF avionics laboratory reentry electromagnetics program, The Entry Plasma Sheath and Its Effects on Space Vehicle Electromagnetic Systems, Vol.

I,   F. Chen, An Introduction to Plasma Physics and Controlled Fusion (Plenum, New York, ). Google Scholar Crossref; 5. Huber, “ The entry plasma sheath and its effects on space vehicle electromagnetic systems,” NASA Technical Report No.

SP, Google Scholar; 6. Swift C T, Beck F B, Thomson J et al RAM C-III S-Band Diagnostic Experiment The Entry Plasma Sheath and its Effects on Space Vehicle Electromagnetic Systems Vol.I (Hampton, VA: NASA Langley Research Center) A large volume uniform plasma generator is proposed for the experiments of electromagnetic (EM) wave propagation in plasma, to reproduce a “black out” phenomenon with long duration in an environment of the ordinary laboratory.

The plasma generator achieves a controllable approximate uniform plasma in volume of mm× mm× mm without the magnetic confinement. A space vehicle moving at hypersonic velocities within a planetary atmosphere will be surrounded by a shock-induced layer of ionized gas. This enveloping ionization, or plasma sheath, can have a prof ound influence on communications and telemetry to and from the vehicle resulting in very high signal.

Marrone, P. V., and Wurster, W. H.:Reentry precursor plasma–determination of the vacuum ultraviolet photoionizing radiation flux, The Entry Plasma Sheath and its Effects on Space Vehicle Electromagnetic Systems, Vol.

NASA SP Google Scholar. Akey, N. D., "Overview of RAM reentry measurements program," The Entry Plasma Sheath and Its Effects on Space Vehicle Electromagnetic Systems,3. Morabito, D. D., "The spacecraft communications blackout problem encountered during passage or entry of planetary atmospheres," IPN Progress Report, Aug.

Grantham, “ The entry plasma sheath and its effects on space vehicle electromagnetic systems,” NASA SP (Scientific and Technical Information Office National Aeronautics and Space Administration, Washington, DC, ), Vol.

1, p. During the reentry process, the plasma sheath covering the surface of the hypersonic aircraft will cause the amplitude attenuation and phase jitter of the communication electromagnetic waves. Channel parameters such as the electron density and collision frequency of the plasma sheath reflect the changing trend of the plasma sheath, and these parameters can be measured by physical means.

"A Computational Method For Unified Solutions To The Inviscid Flow Field About Blunt Bodies", The Entry Plasma Sheath And Its Effects On Space Vehicle Electromagnetic Systems, (proceedings of the Fourth Plasma Sheath Symposium), NASA SP, pp.Center to study plasma sheath effects on the communication systems of reentry vehicles.

This program is called Project RAM, for Radio Attenuation Measurements, and combines both theoretical and experimental investigations of the plasma. sheath. One of the principal areas of investigation involves the study of electromag. An electromagnetic method for removing the communication blackout with a space vehicle upon re-entry into the atmosphere Journal of Applied Physics, Vol.

No. 9 Laboratory simulation of laser propagation through plasma sheaths containing ablation particles of ZrB_2-SiC-C during hypersonic flight. Marrone, P. V., and Wurster, W. H.:Reentry precursor plasma – determination of the vacuum ultraviolet photoionizing radiation flux, The Entry Plasma Sheath and its Effects on Space Vehicle Electromagnetic Systems, Vol.

1. NASA SP Google Scholar.The plasma sheath contains so many free electrons and ions that it can attenuate RF waves greatly through reflection and absorption effects. The primary problem associated with the reentry plasma sheath is the “communications blackout” during which performances of on-board electromagnetic systems can be severely degraded [2].This plasma sheath causes the interruption of radio communications between the space vehicle and ground based stations commonly referred to as the reentry communications blackout.

To solve the blackout problem, a knowledge of the reentry plasma sheath properties (electron density, electron collision frequency, electron temperature and plasma.