1970
DOI: 10.21236/ad0716818
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Fog Modification by Use of Helicopters

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Cited by 2 publications
(3 citation statements)
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“…We chose a grid-based recursive Bayesian filter as it can be rapidly implemented for a low-dimensional state-space representation of the rotorcraft downwash with linear parameter estimates and nonlinear measurement models. 2 It is of note that even though linear paramater estimates and Gaussian white noise is assumed for our measurement and process noise, these are not required assumptions for the Bayesian filter.…”
Section: Height and Speed Estimationmentioning
confidence: 99%
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“…We chose a grid-based recursive Bayesian filter as it can be rapidly implemented for a low-dimensional state-space representation of the rotorcraft downwash with linear parameter estimates and nonlinear measurement models. 2 It is of note that even though linear paramater estimates and Gaussian white noise is assumed for our measurement and process noise, these are not required assumptions for the Bayesian filter.…”
Section: Height and Speed Estimationmentioning
confidence: 99%
“…Rotorcraft operation in ground effect (IGE) presents substantial challenges for vehicle control, including landing with low-impact velocity and maintaining near-ground hover in low-visibility conditions such as brownout [1], fog [2], snow or darkness. Safe operation IGE requires a controller capable of handling uncertainty.…”
Section: Introductionmentioning
confidence: 99%
“…Οι πιο εκτεταμζνεσ δοκιμζσ τθσ τεχνικισ αυτισ τθσ ανάμειξθσ του αζρα με τθ βοικεια ελικοπτζρου, ζγιναν με τθ ςυνεργαςία τθσ αεροπορίασ και του ςτρατοφ των Θ.Ρ.Α. το Σεπτζμβριο του 1969 ςτο Lewisburg τθσ Δυτικισ Βιρτηίνια (Plank et al, 1970). Τα αποτελζςματα και οι κεωρθτικζσ αναλφςεισ που ακολοφκθςαν, ζδειξαν ότι οι ηϊνεσ κακαροφ αζρα μποροφν να δθμιουργθκοφν με τθ βοικεια ενόσ μετρίου μεγζκουσ ελικόπτερου ςτισ περιςςότερεσ περιπτϊςεισ που το πάχοσ τθσ ομίχλθσ δεν ξεπερνά τα 300 ft (90 m) και θ επζμβαςθ πραγματοποιείται περίπου μία ϊρα πριν από τθ διάλυςθ τθσ ομίχλθσ.…”
Section: ανάμιξη του αζρα με τη βοήθεια ελικοπτζρουunclassified