Pilot Land Research Articles

Modeling of Pilot Landing Approach Control Using Stochastic Switched Linear Regression Model

DOI: 10.2514/1.C000204 Human pilot control during the landing approach is modeled using a stochastic switched model, which is a combination of the conventional linear regression model and a hidden Markov model. Using this model, the time histories of pilot control can be categorized in several states, such as pitch stabilizing mode. First, the selection of modelinputsisdiscussed.Basedondataobtainedin flightsimulatorexperiments,thepilotapproachcontrolmodelis constructed for several cases, with different wind conditions applying an expectation-maximization algorithm. The obtained models are analyzed with respect to the timing of state transitions and the stochastic-switched-model gain parameters. The current findings suggest that the proposed analysis method has a great potential to reveal a pilot’s decision-making process.

Neural Network Modeling of Lateral Pilot Landing Control

Human pilot landing control has been analyzed by the authors using neural network modeling. Although the previous research considered only longitudinal control, analysis of the lateral control is the focus of this paper. The lateral control can be quite difficult under crosswind conditions, because the combination of two lateral control methodologies (crab method and wing-low method) is needed for a successful landing. To analyze lateral control, this paper makes a first step: a lateral pilot control model is established. The necessary visual cues for lateral control are defined, and neural network models for aileron and rudder controls are constructed. The adequacy of the proposed neural network model is checked by Monte Carlo simulations.

Neural Network Analysis of Pilot Landing Control in Real Flight

Neural Network Analysis of Pilot Landing Control in Real Flight

Diurnal Variation of Meteorological Parameters in the Land Surface Interface

A pilot land surface processes experiment was conducted at Anand, Gujarat, situated in the western part of India, from April to July 1995. The diurnal variation of air and soil temperature with respect to solar radiation was studied in two selected periods, one in summer and the other during monsoon. It was observed that during summer, there was a considerable lag in the temperature maxima with respect to solar radiation, as compared to the monsoon period. Also, in summer, when there was an increase in wind speed from near zero values in the early morning hours, the soil surface as well as the air temperature minima were raised.

The FIFE Data Publication Experiment

Abstract The First ISLSCP Field Experiment (FIFE) provided an opportunity to test the concept of data publication for long-term access to valuable scientific data. In analogy with the procedures used in research publication, the FIFE Information System and NASA’s Pilot Land Data System adapted the functions performed by authors, editors, and publishers to an information management environment. Procedures and standards were developed to organize, quality check, document, and review data and associated supporting information for publication on a series of five CD-ROM volumes. The CD-ROM series has been successfully published and is in widespread use in the scientific community. The preliminary indications are that this publication will pass the “20-year test” recommended by a committee of the National Research Council for preserving global change data. It is concluded that the data publication approach, using near-permanent distributable publication units like CD-ROMs, is an important addition to the tools ...

Aircraft/Deck Interface Dynamics for Destroyers

The interface between vertical takeoff and landing (VTOL) aircraft and destroyer and frigate-type warships involves a great many factors. This paper discusses a computer analytical technique which permits dynamic analysis of the aircraft landing or taking off from a moving deck or being handled or stowed on the ship. A condensed explanation of how the synthetic time histories are generated is contained in the Appendix. Two examples of how the technique has been used are included: first, a Recovery Assist and Secure System (RAS) analysis, and second, a pilot landing aid system, the Landing Period Designator (LPD) research program.

Advancements in land science data management Pilot Land Data System

The Pilot Land Data System (PLDS) is a newly initiated proof-of-concept system managed by NASA's Goddard Space Flight Center to improve access, data processing, transfer and analysis of land related data for NASA and NASA-sponsored land science researchers. A selected set of operational science projects were chosen to establish processing needs, analysis capabilities, communication requirements, and to provide overall system design requirements for an eventual operational system in the 1990's. This approach provides accurate and timely inputs from the users to ensure basic analysis requirements which then can be used to drive the system's functional and operational requirements. The system will be distributed in nature, limited in scale and will address: 1. o Data management which will establish a central directory, provide advanced data access and storage, browse and catalog capabilities and a natural language interface. This capability will support the management of spatial data and other related data, along with value-added information management services for supporting land related research. 2. o Communication capabilities that will allow the efficient, rapid transfer of data sets from one remote location to another, and interconnection with data bases and computers. These services include electronic mail, remote log-in, and file transfer. 3. o Land analysis software tools that will incorporate sensor calibration, radiometric and geometric correction. It will also provide advanced algorithms for spatial and textural analysis and modeling. 4. o System access capabilities which will address data format standardization and protocols. It will also simplify access to central resources, provide for selected access to currently unaccessible processors and data, place tools for processing data directly under the management of the scientist, improve data display, and simplify user interaction with software. 5. o Special processes which will support the inclusion of hardware and software developed outside of PLDS as appropriate to a specific needed capability and that do not conflict with any specific existing technical development. Artificial intelligence design concepts will be employed in the PLDS in order to develop a goal-oriented system that has value-added services that will allow the system to support the scientist in an intelligent manner. An intelligent PLDS will provide a very friendly interface for the user. Such an interface means that much of the knowledge that is presently required to operate a computer system will be unnecessary because communication between user and system will be done using human rather than computer languages. To accomplish these things will require a close working relationship between land and information scientists to translate future research processing needs and information science capabilities. The ultimate purpose is to improve the quality of worldwide land related research, and to integrate this system into an operational global research tool.

NASA's pilot land data system development program

The NASA Pilot Land Data System (PLDS) project is intended to enhance the effectiveness of data processing capabilities used by researchers applying remote sensing data in land science research. Two sites in the centerminous U.S. have been selected as study areas scanned by Landsat, Nimbus and GOES instruments. The data will be analyzed by teams of researchers representing different fields of expertise. The PLDS program will explore data management, networking and communications, system access capabilities, land analysis software, special processes and overall systems engineerng. The data will be processed by researchers working interactively through remote supermicrocomputer workstations using a variety of operating systems and on-site software capabilities.

The Canada land inventory pilot land use planning projects

The Canada land inventory pilot land use planning projects

Dujaila: Iraq's Pilot Project for Land Settlement

ID _ UJAILA is a pilot land settlement project, first project of its kind in the Arab Middle East and the forerunner of a large scale social experiment. 1 It is significant in that it is all Iraqi conceived and executed, the first locally developed attempt to solve the pressing land tenure problems of the arid A/Iiddle East. If the coming years prove as successful for Dujaila as the preceding six, this pilot project will point the way for five larger projects of similar type now being planned in Bagdad. Other Middle Eastern governments are watching its development closely. Their agrarian problems are not totally dissimilar, and they hope to learn much from the operation of this project.