TITLE

The effects of patch-potentials on the gravity probe B gyroscopes

AUTHOR(S)
Buchman, S.; Turneaure, J. P.
PUB. DATE
July 2011
SOURCE
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p074502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Gravity probe B (GP-B) was designed to measure the geodetic and frame dragging precessions of gyroscopes in the near field of the Earth using a drag-free satellite in a 642 km polar orbit. Four electrostatically suspended cryogenic gyroscopes were designed to measure the precession of the local inertial frame of reference with a disturbance drift of about 0.1 marc sec/yr-0.2 marc sec/yr. A number of unexpected gyro disturbance effects were observed during the mission: spin-speed and polhode damping, misalignment and roll-polhode resonance torques, forces acting on the gyroscopes, and anomalies in the measurement of the gyro potentials. We show that all these effects except possibly polhode damping can be accounted for by electrostatic patch potentials on both the gyro rotors and the gyro housing suspension and ground-plane electrodes. We express the rotor and housing patch potentials as expansions in spherical harmonics Yl,m(θ,[lowercase_phi_synonym]). Our analysis demonstrates that these disturbance effects are approximated by a power spectrum for the coefficients of the spherical harmonics of the form V02/lr with V0 ≈ 100 mV and r ≈ 1.7.
ACCESSION #
63502305

 

Related Articles

  • Topographic and atmospheric effects on goce gradiometric data in a local north-oriented frame: A case study in Fennoscandia and Iran. Mehdi Eshagh; Lars Sjöberg // Studia Geophysica & Geodaetica;Jan2009, Vol. 53 Issue 1, p61 

    Abstract  Satellite gradiometry is an observation technique providing data that allow for evaluation of Stokes’ (geopotential) coefficients. This technique is capable of determining higher degrees/orders of the geopotential coefficients than can be achieved by traditional dynamic...

  • Earth Bound. Krogh, Matthew D. // Planning;Jul2003, Vol. 69 Issue 7, p26 

    Focuses on the importance of satellite data for ecological planning in the U.S. Capability of high spatial resolution to determine what type of data to seek; Types of satellite data; Superiority of medium spatial resolution compared to high resolution data in terms of ecological needs. INSET:...

  • La Realización del Sistema Geocéntrico de Referencia en Venezuela dentro del Marco del Proyecto SIRGAS. Hernández, José Napoleón // Revista Cartográfica;ene-dic2003, Issue 76/77, p87 

    This paper show the accomplish of the geocentric reference system of Venezuela, inside SIRGAS project (Geocentric Reference system for the Americas), performing a GPS surveying program with the purpose to establish a modern geodetic network compatible with measuring satellite technologies, named...

  • An Alternative Source of Very High-resolution Imagery: The Resurs-DK1 Satellite. Petrie, Gordon // GEOInformatics;April2010, Vol. 13 Issue 3, p30 

    The article offers information on the Resurs-P1 and the Resurs-P2 satellites which are owned by the Russian Federal Space Agency (Roskosmos). It notes that these satellites are under development by the Russian Progress State Research & Space Rocket Production Center (TsSKB) in Samara. It...

  • The International GNSS Service Any Questions? Moore, Angelyn W. // GPS World;Jan2007, Vol. 18 Issue 1, p58 

    The article provides information regarding the International Global Navigation Satellite Systems Service (IGS). IGS is based on a global network of 379 geodetic-quality global positioning system operated by more than 100 agencies worldwide. Also, IGS measurements help monitor the movement and...

  • Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance. Bonin, J. A.; Chambers, D. P. // Cryosphere;2015, Vol. 9 Issue 5, p1761 

    Mass change over Greenland can be caused by either changes in the glacial dynamic mass balance (DMB) or the surface mass balance (SMB). The GRACE satellite gravity mission cannot directly separate the two physical causes because it measures the sum of the entire mass column with limited spatial...

  • Low temperature tool for photoluminescence mapping with submicron resolution. De Vittorio, M.; Melcarne, A.; Rinaldi, R.; Cingolani, R. // Review of Scientific Instruments;Jun2001, Vol. 72 Issue 6, p2610 

    We have developed a local probe technique in order to realize photoluminescence maps with submicron resolution at temperatures as low as 25 K. To this end a closed cycle He cryostat has been modified in order to damp mechanical vibrations to avoid spatial resolution losses. Both the optical...

  • Will GNSS networks replace GRS monuments? Martin, Jim // Point of Beginning;Aug2009, Vol. 34 Issue 11, p45 

    The article focuses on the advantages of roving global navigation satellite system (GNSS) networks over the geodetic reference system (GRS) monuments in the surveying services. It states that GRS monuments are used by surveyors to establish state plane coordinates for subdivision corners and...

  • Zeroing in on Zombie Sat. Taverna, Michael A. // Aviation Week & Space Technology;5/24/2010, Vol. 172 Issue 20, p32 

    The article discusses efforts to prevent potential disruptions to neighboring satellites from the Galaxy 15 satellite, which has drifted from its assigned orbit. The flight of the AMC-11 satellite will be adjusted to account for Galaxy 15's drift, and similar action will be taken with respect to...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics