Emergency navigation system and method in satellite receiving failure state of vehicle-mounted navigation system

Abstract

The invention discloses an emergency navigation system and method in a satellite receiving failure state of a vehicle-mounted navigation system. The emergency navigation system comprises the followingsteps that (1), the initial coordinate P0, the speed v0 and the angle w of a vehicle are recorded; (2), after a moment delta t, the travelled distance changed quantity delta s of a vehicle body and the angle changed quantity delta w of the vehicle body are calculated; (3), according to the delta s and the delta w, the P0 is updated to obtain the moving coordinate P1 of the vehicle body; (4), according to the moving coordinate P1, the track, on a navigation map, of the vehicle body is updated, so that a vehicle is guided; (5), the newly generated moving coordinate P1 replaces the initial coordinate P0; (6), whether satellite receiving is recovered or not is detected, and if not, the second to sixth steps are executed circularly. When a GPS signal is cut off, the emergency navigation methodis adopted, continuous driving of the vehicle on an existing navigation path can continue to be guided, a driver can get navigation an experience same as that brought by satellite navigation, so thatthe driver is prevented from going in a wrong direction.

Description

technical field [0001] The invention relates to the technical field of vehicle navigation, in particular to an emergency navigation system and method when a vehicle navigation device fails to receive satellites. Background technique [0002] Car navigation is carried out by using car GPS (Global Positioning System) and electronic map. It can tell the driver the shortest or fastest route to the destination conveniently and accurately, and is a good helper for the driver. Although the current GPS signal has covered most areas, in real road conditions, there are inevitably some signal blind spots, such as some tunnels, viaducts, underground parking lots or a certain section of mountain road with poor signal coverage. When the car enters these signal blind spots, The car navigator may fail to receive satellites for a short time, and cannot obtain positioning data in time, which will make car owners who rely on navigation at a loss what to do, thus causing driving inconvenience. ...

AI Technical Summary

Problems solved by technology

Although the current GPS signal has covered most areas, in real road conditions, there are inevitably some signal blind spots, such as some tunnels, viaducts, underground parking lots or a certain section of mountain road with poor signal coverage. When the car enters these signal blind spots, The car navigator may fail to receive satellites for a short time, and cannot obtain positioning data in time, which will make car owners who rely on navigation at a loss what to do, resulting in driving inconvenience

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