Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Guidance algorithm"”.
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A Guidance Algorithm for Unmanned Surface Vehicle Exhibiting Sternward Motion
… a new dynamically feasible trajectory generation algorithm that incorporates sternward motion for unmanned surface vehicles. This work is motivated by riverine applications where the operating environment is large and poorly known. We extend a navigation approach for forward path planning into a …
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An adaptive numeric predictor-corrector guidance algorithm for atmospheric entry vehicles
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1987.
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An extended analytic range corrector method for the space shuttle entry guidance algorithm
Space shuttle entry guidance with an extended analytic range corrector method is presented. The guidance method is a variation of Shuttle entry guidance in which the parameters that define the drag profile are modified using quadratic splines to make the drag profile smooth and easier to customize. …
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Entry vehicle performance analysis and atmospheric guidance algorithm for precision landing on Mars
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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A predictor-corrector guidance algorithm design for a low L/D autonomous re-entry vehicle
… turn-around-times for successive flights. A guidance scheme that best adheres to these goals and captures the vehicle's capability is desired. During re-entry, the PL-RLV's second stage, the Precision Landing Vehicle 2 (PLV-2), will perform a reversal maneuver. This thesis concentrates on a …
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Orbital rendezvous using an Augmented Lambert Guidance scheme
The development of an Augmented Lambert Guidance Algorithm that matches the position and velocity of an orbiting target spacecraft is presented in this thesis. The Augmented Lambert Guidance Algorithm manipulates the inputs given to a preexisting Lambert guidance algorithm to control the boost of a …
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Bearings-only tracking automation for a single unmanned underwater vehicle
… areas near shorelines. This thesis presents a guidance algorithm for this particular mission. This thesis first presents a Modified Polar Extended Kalman Filter for the estimation problem. Bearings-only tracking is a nonlinear problem that requires some sort of estimator to determine the target …
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Assessment of application of the steep-lifting entry trajectory solution to real-time entry guidance
Closed-form analytical guidance algorithms are highly desirable in the context of real-time aerospace guidance applications. The steep-lifting entry trajectory solution is a set of closed-form analytical approximate solutions to the planar equations of motion, which includes expressions for range, …
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Rendezvous approach guidance for uncooperative tumbling satellites
… of a Rendezvous and Proximity Operations (RPO) guidance algorithm for approaching uncooperative tumbling satellites has multiple purposes including on-orbit satellite servicing, space debris removal, asteroid mining, and on-orbit assembly. This thesis develops a guidance algorithm within the …
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Reentry guidance with extended range capability for low L/D spacecraft
A generalized reentry/precision landing algorithm using bank angle modulation control was designed for a low lift-to-drag ratio (L/D) spacecraft that enables precision landing for target locations between 2,400 km and 10,000 km downrange of Entry Interface (EI). The Crew Exploration Vehicle (CEV) …
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Pitch-Control Predictor-Corrector and Neural Network Ascent Guidance
A pitch-control predictor-corrector ascent guidance algorithm has been developed and evaluated for a rocket-based upper stage of a two-stage-to-orbit launch vehicle. Detailed descriptions of the predictor-corrector algorithm and a neural network loop modification are given. The mission requirement …
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An Aerocapture Guidance and Estimation Framework for Improved Robustness to Uncertainty
… uncertainties. This drives the need for robust guidance algorithms and accurate environmental estimation techniques. This thesis presents approaches to address both of these needs, developing solutions to improve aerocapture performance and robustness to uncertainty. The first contribution is …
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Integration of potential field theory and proportional navigation theory to autonomously guide an unmanned aerial vehicle.
… and proportional navigation, a popular missile guidance algorithm. The new algorithm modifies the old algorithms to allow a UAV to track an optimal path to, and rendezvous with, a moving target while avoiding obstacles in its path. A model for a quad rotor style UAV is developed and controlled …
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Bioelectrical strategies for image-guided therapies
… developed two novel localization methods for the guidance of cardiac ablation and other minimally-invasive therapies. The first method, the Inverse Solution Guidance Algorithm (ISGA), is for the non-invasive and rapid localization of the site of origin of an arrhythmia and an ablation catheter tip …
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Design and implementation of test-bed for path planning and formation control of cooperative robotic agents
… and maintain general speed to form a guidance algorithm. Furthermore we use the kinematic model of a two differential steering systems to derive the inverse kinematic equations, and generate any type of trajectory within the physical constrains of the system.'
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Real-time quasi-analytical trajectory generation for docking with tumbling objects
… satellite servicing, and in-space assembly. Guidance and control algorithms have been developed in the literature to allow for a spacecraft to capture an uncooperative and tumbling object under several constraints such as collision avoidance, speed bounds, and thruster saturation. However, …
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A Legendre Pseudospectral Method for rapid optimization of launch vehicle trajectories
… of convergence of some problems. A predictive guidance algorithm demonstrates the feasibility of using the method to find both open- and closed-loop controls for a single-stage, three dimensional launch problem. The effects of different aerodynamic models between the optimizer and the "real" …
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Optimal and on-board near-optimal midcourse guidance
Optimal midcourse guidance is examined for an air-to-air missile featuring boost-coast-sustain propulsion. A vertical plane, point-mass model is studied with load factor as a control variable. Time-range-energy optimal trajectories are computed, open-loop, via the usual necessary conditions and a …
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Optimizing terminal conditions using geometric guidance for low-control authority munitions
… system hardware tradeoffs. This thesis develops guidance algorithm modifications that demonstrate consistent improvement in achieving these objectives over previously used methods with changes only to the flight software and not the hardware or system concept of operations. Most modifications …
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Modeling and Simulation of Autonomous Thermal Soaring with Horizon Simulation Framework
… roll moment calculation. The autonomous guidance algorithm for the glider included a turn logic which would determine the correct turn direction for the glider when a thermal is detected. The thermal model developed in this thesis included the capabilities to vary the time dependent …
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