Showing papers on "Turn-by-turn navigation published in 1990"

Land vehicle navigation apparatus with visual display

Abstract: Land vehicle navigation apparatus (10) with a visual display (16, 20) is provided. The apparatus provides a visual display of a calculated navigation route (22) with a visual indication (23) of the direction of desired travel along the navigation route. An off route map display portion (28) is provided which has the visual navigation route display (22) in one color and, in a second contrasting color, a visual display (24, 26) of actual vehicle travel. A separate additional feature is that an off route display (20) provides a visual display portion (29) of a plurality of operator selectable off route recovery options (1-6). Off route recovery means (12, 49-63) are provided such that the vehicle operator can implement the visually displayed recovery options. The result is a navigation system which visually provides vehicle navigation information to the vehicle operator in an improved minimal comprehension time format, and allows the vehicle operator to select for himself how to recover from an off route condition.

Situationally driven local navigation for mobile robots

Abstract: For mobile robots to autonomously accommodate dynamically changing navigation tasks in a goal-directed fashion, they must employ navigation plans. Any such plan must provide for the robot's immediate and continuous need for guidance while remaining highly flexible in order to avoid costly computation each time the robot's perception of the world changes. Due to the world's uncertainties, creation and maintenance of navigation plans cannot involve arbitrarily complex processes, as the robot's perception of the world will be in constant flux, requiring modifications to be made quickly if they are to be of any use. This work introduces Navigation Templates (or NaTs) which are building blocks for the construction and maintenance of rough navigation plans which capture the relationship that objects in the world have to the current navigation task. By encoding only the critical relationship between the objects in the world and the navigation task, a NaT-based navigation plan is highly flexible; allowing new constraints to be quickly incorporated into the plan and existing constraints to be updated or deleted from the plan. To satisfy the robot's need for immediate local guidance, the NaTs forming the current navigation plan are passed to a transformation function. The transformation function analyzes the plan with respect to the robot's current location to quickly determine (a few times a second) the locally preferred direction of travel. This dissertation presents NaTs and the transformation function as well as the needed support systems to demonstrate the usefulness of the technique for controlling the actions of a mobile robot operating in an uncertain world. ftn*This work was supported in part by a grant from the Jet Propulsion Laboratory under a contract from the National Aeronautics and Space Administration, and by a grant from the Naval Surface Weapons Center.

Backup navigation system

Abstract: A backup navigation system that is failure resistant. The backup navigationystem has a multiple member of navigation subsystems. The backup navigation system has the same multiple number of computers. Each computer has the same multiple number of computer processors. Each navigation subsystem is connected to only one computer processor of each computer. Each computer selects data from one of its computer processors in preference to data from any other of its computer processors. Each computer provides a navigation output. Each navigation output is sent into a control navigation computer. One of these navigation outputs is selected by the control navigation computer. A navigation output from one of the computers can also be selectively sent into a navigation interface buffer.

Giving cars a mind of their own : automobile-navigation technology may soon turn road maps into collector's items

Abstract: This article gives an overview of automobile navigation systems by type: navigation by sensors and navigation by satellite. The Etak Navigator and NEC's navigation system are briefly described.