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  • Earth Resources and Remote Sensing  (2)
  • Space Communications, Spacecraft Communications, Command and Tracking  (1)
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  • 1
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    Site Distribution and Aliasing Effects in the Inversion for Load Coefficients and Geocenter Motion from GPS Data (2002)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: Precise GPS measurements of elastic relative site displacements due to surface mass loading offer important constraints on global surface mass transport. We investigate effects of site distribution and aliasing by higher-degree (n greater than or equal 2) loading terms on inversion of GPS data for n = 1 load coefficients and geocenter motion. Covariance and simulation analyses are conducted to assess the sensitivity of the inversion to aliasing and mismodeling errors and possible uncertainties in the n = 1 load coefficient determination. We found that the use of center-of-figure approximation in the inverse formulation could cause 10- 15% errors in the inverted load coefficients. n = 1 load estimates may be contaminated significantly by unknown higher-degree terms, depending on the load scenario and the GPS site distribution. The uncertainty in n = 1 zonal load estimate is at the level of 80 - 95% for two load scenarios.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: Geophysical Research Letters (ISSN 0094-8276); Volume 29; No. 24
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    GPS (2006)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: Geodetic networks support the TRF requirements of NASA ESE missions. Each of SLR, VLBI, GPS substantially and uniquely contributes to TRF determination. NASA's SLR, VLBI, and GPS groups collaborate toward wide-ranging improvements in the next 5 years. NASA leverages considerable resources through its significant activity in international services. NASA faces certain challenges in continuing and advancing these activities. The Terrestrial Reference Frame (TRF) is an accurate, stable set of positions and velocities. The TRF provides the stable coordinate system that allows us to link measurements over space and time. The geodetic networks provide data for determination of the TRF as well as direct science observations.
    Keywords: Earth Resources and Remote Sensing
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Damage Proxy Map from Interferometric Synthetic Aperture Radar Coherence (2015)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A method, apparatus, and article of manufacture provide the ability to generate a damage proxy map. A master coherence map and a slave coherence map, for an area prior and subsequent to (including) a damage event are obtained. The slave coherence map is registered to the master coherence map. Pixel values of the slave coherence map are modified using histogram matching to provide a first histogram of the master coherence map that exactly matches a second histogram of the slave coherence map. A coherence difference between the slave coherence map and the master coherence map is computed to produce a damage proxy map. The damage proxy map is displayed with the coherence difference displayed in a visually distinguishable manner.
    Keywords: Earth Resources and Remote Sensing
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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