A procedure to control all six DOF (degrees of freedom) of a UAV (unmanned aerial vehicle) without an external reference system and to enable fully autonomous flight is presented here. For 2D positioning the principle of optical flow is used. Together with the output of height estimation, fusing ultrasonic, infrared and inertial and pressure sensor data, the 3D position of the UAV can be comput...

A modified Code Noise and Multipath (CNMP) algorithm is presented for dual-frequency differential GPS precision approach and landing. Pseudorange noise and multipath are exchanged for reducible biases in both reference station and aircraft ranging measurements. The second frequency is used only to correct the code-minus-carrier observable. Corrected pseudorange measurements are combined using a...

Autonomous landing is a challenging but important task for Unmanned Aerial Vehicles (UAV) to achieve high level of autonomy. The fundamental requirement for landing is the knowledge of the height above the ground, and a properly designed controller to govern the process. This paper presents our research results in the study of landing an autonomous helicopter. The above‐the‐ground hei...

A STATISTICAL SEPARATION STANDARD AND RISK-THROUGHPUT MODELING OF THE AIRCRAFT LANDING PROCESS Babak Ghalebsaz Jeddi, Ph.D. George Mason University, 2008 Dissertation Director: Dr. John F. Shortle In the context of a high demand for runways as important scarce resources of the national air transportation system, this dissertation is concerned with the problem of determining the best separation ...

Integrated Vehicle Health Management (IVHM) is one of the few technologies that will help in reducing both maintenance and operational costs, while improving the overall safety of an aircraft. It also helps in moving away from conservative design philosophies. Hence IVHM is increasingly being adopted in various aircraft programs. IVHM requires a multi-disciplinary approach bringing together the...

The frequent jumps of the eyeballs-called saccades-imply the need for a constant correction of motor errors. If systematic errors are detected in saccade landing, the saccade amplitude adapts to compensate for the error. In the laboratory, saccade adaptation can be studied by displacing the saccade target. Functional selectivity of adaptation for different saccade types suggests that adaptation...

The Di erential Global Positioning System-based precision approach and landing architectures proposed by the Federal Aviation Administration (FAA) include the Wide Area Augmentation System (WAAS) and the Local Area Augmentation System (LAAS) for performing landings in Category (CAT) I and CAT III minima, respectively. The Required Navigation Performance (RNP) for GPS-based satellite navigation ...