Guidance system

About: Guidance system is a research topic. Over the lifetime, 4282 publications have been published within this topic receiving 45964 citations.

Wearable-Assisted Localization and Inspection Guidance System Using Egocentric Stereo Cameras

Abstract: As industrial inspection and maintenance tasks in outdoor working environments are increasingly complex and flexible, wearable assistive system (WAS) has shown promising prospects, especially when the tasks are infrequent and unfamiliar to workers. Such tasks require more accurate and global ego-localization than using GPS. In this paper, a wearable-assisted navigation system is proposed for task-specific route guidance. This paper proposes to learn a global metric-topological abstract map of outdoor workspace using the combination of stereo cameras and inertial measurement units. An extended stereo visual simultaneous localization and mapping approach is proposed with optimization that deals with cross-session loop-closure detection and pose rectification for bounding estimation error as well as aligning the positions to global world frame. Thus, the system allows building and using globally consistent maps across sessions. A prototype of WAS is developed in which the augmentations of guidance are delivered to users via an optical see-through display. The system is evaluated by experiments designed as on-site inspection scenarios and the results validate the practicability and effectiveness of the system.

Time and energy efficient trajectory generator for autonomous underwater vehicle docking operations

Abstract: This paper presents a novel real-time quasi-optimal trajectory generator, based on the inverse dynamics in the virtual domain (IDVD) method, to produce a reliable and efficient guidance system for autonomous underwater vehicle (AUV) docking operations. To this end, a challenging docking scenario is defined in a cluttered operating field, encompassing ocean currents and no-fly zones. Using the IDVD method, a trajectory that takes into consideration the hydrodynamic model of the vehicle is generated and the optimality of this trajectory, in regards to mission time and energy expenditure of the vehicle, is considered. Computer simulations demonstrate that the IDVD-based strategy enables the guiding of a vehicle into the dock by satisfying the final boundary conditions of the dock's position and orientation. Generated trajectories are feasible, smooth and realizable using for the vehicle's low-level auto-pilot module. In terms of computation, the solution is suitable for real-time implementation that incorporates uncertainty handling of the operating environment. For further analysis, the generated trajectory is evaluated on a high fidelity AUV simulator. The result of this latter test also demonstrates applicability of the utilized IDVD method for optimization of docking trajectories.

PersianGulf: An Autonomous Combined Traffic Signal Controller and Route Guidance System

Abstract: Traffic signal controllers and route guidance systems are two major subsystems of Intelligent Transportation Systems that influence each other directly. Due to correlation between these subsystems, some research has been done to combine them into an integrated system. In this paper, PersianGulf - an autonomous combined traffic signal controller and route guidance system - will be proposed which has two unique features as compared to similar research. First, it is totally distributed because calculation of optimal routes are done independently in traffic signal controllers of intersections and second, it is totally autonomous because there is no need to communicate/cooperate with either traffic supervisors such as traffic management centers or the vehicles/drivers. Also, Simulation results show that PersianGulf improve the average speed of vehicles significantly in the simulated scenarios.

Laser missile guidance system

Abstract: A laser missile guidance system in which a projectile or missile is fired ward a predetermined target with the missile being tracked on its flight toward the target by laser radar, processing the laser radar information in a computer apparatus and finally computing a new trajectory from the missile to the target and transmitting correction signals to a correction device on the missile including thrusters on the missile to cause the trajectory of the missile to be changed to the newly computed trajectory for the missile. This system corrects the trajectory of the missile while in flight by recomputing a trajectory from the missile to the predetermined target and making appropriate corrections each time. This enables the missile to only contain laser radar reflecting means, and correction detection and control means on the missile rather than having gyro and laser type devices on board the missile which take up a considerable amount of space and weight.

Computer-Animated Predictive Displays for Microwave Landing Approaches

Abstract: The safe, orderly, and economical flow of air traffic at congested metropolitan airports can result from the advent of microwave radio guidance systems. By providing aircraft position in three dimensions, these terminal navigation aids potentially allow steeply curved landing approaches that will facilitate unprecedented noise abatement procedures, large fuel savings, and precisely timed arrivals at airport runways. To implement such complex flight procedures will require a combination of semiautomatic computer-assisted airplane guidance and control and radically different flight displays if pilots are to monitor such maneuvers confidently and execute them manually when necessary. Results of a simulator investigation, involving visual guidance and flight-path prediction embedded in computer-animated contact analog displays, show that pilots can reliably execute computer-programmed curved approaches to airport runways with the needed precision in the face of severe wind shears.