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Full-Text Articles in Engineering
Impacts Of Distributions And Trajectories On Navigation Uncertainty Using Line-Of-Sight Measurements To Known Landmarks In Gps-Denied Environments, Ryan D. Lamoreaux
Impacts Of Distributions And Trajectories On Navigation Uncertainty Using Line-Of-Sight Measurements To Known Landmarks In Gps-Denied Environments, Ryan D. Lamoreaux
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Unmanned vehicles are increasingly common in our world today. Self-driving ground vehicles and unmanned aerial vehicles (UAVs) such as quadcopters have become the fastest growing area of automated vehicles research. These systems use three main processes to autonomously travel from one location to another: guidance, navigation, and controls (GNC). Guidance refers to the process of determining a desired path of travel or trajectory, affecting velocities and orientations. Examples of guidance activities include path planning and obstacle avoidance. Effective guidance decisions require knowledge of one’s current location. Navigation systems typically answer questions such as: “Where am I? What is my orientation? …
Applications Of Relative Motion Models Using Curvilinear Coordinate Frames, Alex C. Perez
Applications Of Relative Motion Models Using Curvilinear Coordinate Frames, Alex C. Perez
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A new angles-only initial relative orbit determination (IROD) algorithm is derived using three line-of-sight observations. This algorithm accomplishes this by taking a Singular Value Decomposition of a 6x6 matrix to arrive at an approximate initial relative orbit determination solution. This involves the approximate solution of 6 polynomial equations in 6 unknowns. An iterative improvement algorithm is also derived that provides the exact solution, to numerical precision, of the 6 polynomial equations in 6 unknowns. The initial relative orbit algorithm is also expanded for more than three line-of-sight observations with an iterative improvement algorithm for more than three line-of-sight observations. The …