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  • 11
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    Limited memory optimal filtering. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Limited memory optimal filter theory, output and standard filter divergence due to errors
    Keywords: ELECTRONICS
    Type: AMERICAN AUTOMATIC CONTROL COUNCIL, JOINT AUTOMATIC CONTROL CONFERENCE; Jun 26, 1968 - Jun 28, 1968; ANN ARBOR, MICH.|; YAL SOCIETY (
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    NASA TECHNICAL REPORTS
  • 12
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    Limited memory optimal filtering. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Limited memory optimal filter theory, output and standard filter divergence due to errors
    Keywords: ELECTRONICS
    Type: JOINT AUTOMATIC CONTROL CONFERENCE; Jun 26, 1968 - Jun 28, 1968; ANN ARBOR, MI
    Format: text
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  • 13
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    Adaptive filtering in satellite orbit estimation. (1969)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Adaptive filter for estimating system noise inputs from actual residuals developed to control Kalman filter in satellite orbit estimation
    Keywords: ELECTRONICS
    Type: ASILOMAR CONFERENCE ON CIRCUITS AND SYSTEMS; Oct 30, 1968 - Nov 01, 1968; PACIFIC GROVE, CALIF.
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    NASA TECHNICAL REPORTS
  • 14
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    Instantaneous and time-averaged dispersion and measurement models for estimation theory applications with elevated point source plumes (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Estimation theory, which originated in guidance and control research, is applied to the analysis of air quality measurements and atmospheric dispersion models to provide reliable area-wide air quality estimates. A method for low dimensional modeling (in terms of the estimation state vector) of the instantaneous and time-average pollutant distributions is discussed. In particular, the fluctuating plume model of Gifford (1959) is extended to provide an expression for the instantaneous concentration due to an elevated point source. Individual models are also developed for all parameters in the instantaneous and the time-average plume equations, including the stochastic properties of the instantaneous fluctuating plume.
    Keywords: ENVIRONMENT POLLUTION
    Type: Symposium on Atmospheric Turbulence, Diffusion, and Air Quality; Oct 19, 1976 - Oct 22, 1976; Raleigh, NC
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  • 15
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    Models and error analyses in urban air quality estimation (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Estimation theory has been applied to a wide range of aerospace problems. Application of this expertise outside the aerospace field has been extremely limited, however. This paper describes the use of covariance error analysis techniques in evaluating the accuracy of pollution estimates obtained from a variety of concentration measuring devices. It is shown how existing software developed for aerospace applications can be applied to the estimation of pollution through the processing of measurement types involving a range of spatial and temporal responses. The modeling of pollutant concentration by meandering Gaussian plumes is described in some detail. Time averaged measurements are associated with a model of the average plume, using some of the same state parameters and thus avoiding the problem of state memory. The covariance analysis has been implemented using existing batch estimation software. This usually involves problems in handling dynamic noise; however, the white dynamic noise has been replaced by a band-limited process which can be easily accommodated by the software.
    Keywords: ENVIRONMENT POLLUTION
    Type: AIAA PAPER 76-803 , Astrodynamics Conference; Aug 18, 1976 - Aug 20, 1976; San Diego, CA
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  • 16
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    Adaptive sequential estimation with applications (1973)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A sequential estimator is presented and demonstrated which successfully tracks the system state and model errors in the presence of significant and unpredictable system or environmental variations. This adaptive estimation concept is shown to lead to a new and attractive approach to parameter identification problems. Simulation results are presented in an orbit determination problem and in a reentry trajectory estimation problem.
    Keywords: SPACE VEHICLES
    Type: Symposium on Automatic Control in Space; Jun 04, 1973 - Jun 08, 1973; Genoa; Italy
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  • 17
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    J-Adaptive estimation with estimated noise statistics (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The J-Adaptive estimator described by Jazwinski and Hipkins (1972) is extended to include the simultaneous estimation of the statistics of the unmodeled system accelerations. With the aid of simulations it is demonstrated that the J-Adaptive estimator with estimated noise statistics can automatically estimate satellite orbits to an accuracy comparable with the data noise levels, when excellent, continuous tracking coverage is available. Such tracking coverage will be available from satellite-to-satellite tracking.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Satellite dynamics; Fourth Symposium; Jun 19, 1974 - Jun 21, 1974; Sao Paulo; Brazil
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  • 18
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    Nonlinear and adaptive estimation in reentry. (1972)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The problem of real-time estimation of a lifting reentry vehicle trajectory of the shuttle orbiter type is considered. Simulations feature large position and velocity uncertainties at radar acquisition and realistic model errors in lift, drag and other model parameters. Radar tracking and accelerometer data are simulated. Significant nonlinearities are found to exist on spacecraft acquisition. An iterated nonlinear filter is shown to perform optimally during the radar acquisition phase. An adaptive filter is shown to track time-varying model errors, such as errors in the lift and drag coefficients, down to the noise level. Such real-time model tracking (identification) is frequently required for guidance and control implementation.
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 72-874 , American Institute of Aeronautics and Astronautics, Guidance and Control Conference; Aug 14, 1972 - Aug 16, 1972; Stanford, CA
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    NASA TECHNICAL REPORTS
  • 19
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    On optimal stochastic midcourse guidance. (1967)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Feedback from observations introduced into midcourse guidance correction program, showing optimal random feedback solution obtained for deterministic optimal feedback control problems
    Keywords: NAVIGATION
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  • 20
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    Adaptive sequential estimation with applications (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A sequential estimator is presented and demonstrated which successfully tracks the system state and model errors in the presence of significant and unpredictable system or environmental variations. This adaptive estimation concept is shown to lead to a new and attractive approach to parameter identification problems. Simulation results are presented in an orbit determination problem, where the estimator tracks the orbit and unmodeled accelerations due to errors in the geopotential model. Some results in a re-entry trajectory estimation problem are also summarized.
    Keywords: ELECTRONICS
    Type: Automatica; 10; Mar. 197
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