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Time-controlled descent guidance in uncertain windsA procedure has been developed for constructing a statistical model of the altitude-dependent mean wind profile from the historical record of wind measurements at particular locations. The model is constructed by fitting a Markov process, with altitude as the stage variable, to the historical wind data. The wind model, together with the aircraft dynamics and the error characteristics of the navigation system, are incorporated in the design of a state estimator, which gives the minimum variance estimate of the aircraft state and the wind vector. The state and wind estimates are used as inputs to a linear feedback law for guiding the aircraft along the nominal trajectory. An example design of a time-constrained (4D RNAV) descent guidance system is presented, showing tracking accuracy, control activity, and probability of arrival time with and without the wind estimator.
Document ID
19750057572
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Menga, G.
Erzberger, H.
(NASA Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
August 1, 1975
Subject Category
Aircraft Communications And Navigation
Report/Patent Number
AIAA PAPER 75-1078
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Guidance and Control Conference
Location: Boston, MA
Start Date: August 20, 1975
End Date: August 22, 1975
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
75A41644
Distribution Limits
Public
Copyright
Other

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