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  • 1975-1979  (5)
  • 1
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    Global Earth Response to Loading by Ocean Tide Models (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Mathematical and programming techniques to numerically calculate Earth response to global semidiurnal and diurnal ocean tide models were developed. Global vertical crustal deformations were evaluated for M sub 2, S sub 2, N sub 2, K sub 2, K sub 1, O sub 1, and P sub 1 ocean tide loading, while horizontal deformations were evaluated for the M sub 2 tidal load. Tidal gravity calculations were performed for M sub 2 tidal loads, and strain tensor elements were evaluated for M sub 2 loads. The M sub 2 solution used for the ocean tide included the effects of self-gravitation and crustal loading.
    Keywords: OCEANOGRAPHY
    Type: NASA-CR-159984
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A simulation for gravity fine structure recovery from low-low GRAVSAT SST data (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Covariance error analysis techniques were applied to investigate estimation strategies for the low-low SST mission for accurate local recovery of gravitational fine structure, considering the aliasing effects of unsolved for parameters. A 5 degree by 5 degree surface density block representation of the high order geopotential was utilized with the drag-free low-low GRAVSAT configuration in a circular polar orbit at 250 km altitude. Recovery of local sets of density blocks from long data arcs was found not to be feasible due to strong aliasing effects. The error analysis for the recovery of local sets of density blocks using independent short data arcs demonstrated that the estimation strategy of simultaneously estimating a local set of blocks covered by data and two "buffer layers" of blocks not covered by data greatly reduced aliasing errors.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: NASA-CR-144739 , BTS-TR-76-29
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A computer software system for the generation of global ocean tides including self-gravitation and crustal loading effects (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer software system is described which computes global numerical solutions of the integro-differential Laplace tidal equations, including dissipation terms and ocean loading and self-gravitation effects, for arbitrary diurnal and semidiurnal tidal constituents. The integration algorithm features a successive approximation scheme for the integro-differential system, with time stepping forward differences in the time variable and central differences in spatial variables.
    Keywords: OCEANOGRAPHY
    Type: NASA-CR-152502 , BTS-TR-77-41
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A computer software system for the generation of global ocean tides including self-gravitation and crustal loading effects (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer software system is described which computes global numerical solutions of the integro-differential Laplace tidal equations, including dissipation terms and ocean loading and self-gravitation effects, for arbitrary diurnal and semidiurnal tidal constituents. The integration algorithm features a successive approximation scheme for the integro-differential system, with time stepping forward differences in the time variable and central differences in spatial variables. Solutions for M2, S2, N2, K2, K1, O1, P1 tidal constituents neglecting the effects of ocean loading and self-gravitation and a converged M2, solution including ocean loading and self-gravitation effects are presented in the form of cotidal and corange maps.
    Keywords: OCEANOGRAPHY
    Type: NASA-TM-X-71308 , X-920-77-82
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A simulation for gravity fine structure recovery from high-low GRAVSAT SST data (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Covariance error analysis techniques were applied to investigate estimation strategies for the high-low SST mission for accurate local recovery of gravitational fine structure, considering the aliasing effects of unsolved for parameters. Surface density blocks of 5 deg x 5 deg and 2 1/2 deg x 2 1/2 deg resolution were utilized to represent the high order geopotential with the drag-free GRAVSAT configured in a nearly circular polar orbit at 250 km. altitude. GEOPAUSE and geosynchronous satellites were considered as high relay spacecraft. It is demonstrated that knowledge of gravitational fine structure can be significantly improved at 5 deg x 5 deg resolution using SST data from a high-low configuration with reasonably accurate orbits for the low GRAVSAT. The gravity fine structure recoverability of the high-low SST mission is compared with the low-low configuration and shown to be superior.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-72609 , BTS-TR-76-37
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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