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  • 1970-1974  (4)
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  • 1
    Publication Date: 2016-06-07
    Description: A feasibility study has been initiated on the use of remote earth observations for augmenting stream discharge prediction for the design and/or operation of major reservoir systems, pumping systems and irrigation systems. The near-term objectives are the interpolation of sparsely instrumented precipitation surveillance networks and the direct measurement of water loss by evaporation. The first steps of the study covered a survey of existing reservoir systems, stream discharge prediction methods, gage networks and the development of a self-adaptive variation of the Kentucky Watershed model, SNOPSET, that includes snowmelt. As a result of these studies, a special three channel scanner is being built for a small aircraft, which should provide snow, temperature and water vapor maps for the spatial and temporal interpolation of stream gages.
    Keywords: GEOPHYSICS
    Type: Space for Mankind's Benefit; p 109-119
    Format: application/pdf
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  • 2
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    In:  CASI
    Publication Date: 2019-06-27
    Description: Methods for satellite measurement of continental drift with earth rotation and mathematical logic for active attitude control of spin stabilized spacecraft
    Keywords: SPACE VEHICLES
    Type: NASA-CR-112502
    Format: application/pdf
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  • 3
    Publication Date: 2019-06-27
    Description: Two approaches to an identification problem in hydrology are presented based upon concepts from modern control and estimation theory. The first approach treats the identification of unknown parameters in a hydrologic system subject to noisy inputs as an adaptive linear stochastic control problem; the second approach alters the model equation to account for the random part in the inputs, and then uses a nonlinear estimation scheme to estimate the unknown parameters. Both approaches use state-space concepts. The identification schemes are sequential and adaptive and can handle either time invariant or time dependent parameters. They are used to identify parameters in the Prasad model of rainfall-runoff. The results obtained are encouraging and conform with results from two previous studies; the first using numerical integration of the model equation along with a trial-and-error procedure, and the second, by using a quasi-linearization technique. The proposed approaches offer a systematic way of analyzing the rainfall-runoff process when the input data are imbedded in noise.
    Keywords: GEOPHYSICS
    Type: NASA-CR-129020
    Format: application/pdf
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  • 4
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    In:  Other Sources
    Publication Date: 2019-06-27
    Description: The determination of satellite orbits for use in geodesy using range-only data has been examined. A recently developed recursive algorithm for rectification of the nominal orbit after processing each observation has been tested. It is shown that when a synchronous satellite is tracked simultaneously with a subsynchronous geodetic target satellite, the orbits of each may be readily determined by processing the range information. Random data errors and satellite perturbations are included in the examples presented.
    Keywords: SPACE SCIENCES
    Type: Journal of Spacecraft and Rockets; 10; Feb. 197
    Format: text
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