Method of estimating position of a mobile object in a navigation system

Abstract

A method of estimating position of a mobile object in a navigation system is provided that comprises the steps of loading a mobile object position data backed up during stoppage of the mobile object, at an initial stage of travel as the mobile object restarts traveling, estimating a current position of the mobile object from the loaded position data of the mobile object by virtue of dead reckoning navigation, causing the estimated current position of the mobile object to be matched to a map data, determining whether the mobile object has entered into a link, based on the mobile object position matched to the map data and detection signals indicative of the travel conditions of the mobile object generated from a sensor part, and if the mobile object is determined to have entered into the link, estimating the current position of the mobile object by way of establishing the azimuth angle of the link as an azimuth angle of the mobile object through the dead reckoning navigation.

Description

technical field [0001] [1] The present invention focuses on a method for estimating the position of a moving object in a navigation system. In the case where the dead reckoning method has to be used to navigate and estimate the current position of a moving object due to the failure of normal reception of navigation information, the method sets the moving The azimuth of the link that the object has entered is the azimuth of the moving object itself, which can ensure accurate estimation of the current position of the moving object. Background technique [0002] [2] With the steady increase of moving objects such as motor vehicles, etc., traffic congestion becomes worse. To make matters worse, social infrastructure, including roads, can barely keep up with the swelling number of moving objects. [0003] [3] As a solution to traffic congestion, attention has been focused on navigation systems, which are used in the global positioning system (hereinafter simply referred to as GP...

AI Technical Summary

Problems solved by technology

[0002] [2] With the steady increase of moving objects such as motor vehicles, etc., traffic congestion becomes worse

[0005] [5] During the initial phase of the moving object's travel, i.e., during the initial operation of the navigation system, such events may occur that depend on weather conditions, buildings deployed around the moving object, sun spots, and the current position of the GPS satellites relative to the moving object. The alignment of the position, the failure of the navigation system to correctly receive the navigation information transmitted from the GPS satellites within a period of minimum 30 seconds to maximum 15 minutes

However, estimating the azimuth of the moving object by relying on the gyro detection signal has a limitation in accurately detecting the azimuth of the moving object because a small amount of error is generated at each estimation and the error continues to accumulate while the moving object travels

[0007] [7] In particular, since the error of the azimuth angle of the moving object will be accumulated when the moving object enters and continues to travel along the link of the map, there is a defect that the current position of the moving object cannot be accurately Matches the link, but tends to match to a position that falls outside the link

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