Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1992-02-14
1994-09-27
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342357, 364449, 340990, 340995, G01S 302
Patent
active
053510593
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a navigation system which is mainly used by a driver of an automobile and a method therefor.
BACKGROUND ART
A conventional navigation system having a storage device, a processing device, an input device, a display device, sensors and the like and a navigation method to be executed in the system may be classified into the following two types on the basis of the contents displayed on the display device as driving information provided for a user.
One of the two types is a map display system which is arranged in such a manner that a map is displayed on the screen of the display device and a travelling locus, a present position, a moving direction, a target, a target direction, an instructed course or the like are indicated in the map. Another one is an arrow display system which is arranged in such a manner that no map is displayed but arrows respectively showing the target direction and the course instruction at each intersection are indicated.
The map display system and the arrow display system respectively have encountered the following problems:
According to the map display system, a driver must look at the displayed map while driving a vehicle. Therefore, the driver must pay attention to many factors and thereby the driver will be exhausted, causing a load to be applied to the driver. Furthermore, a risk will arise as the case may be. Therefore, in the conventional map display system, the display device has been disposed in a lower position so that the driver cannot look at it during driving, or only main roads are indicated during driving. However, these devices could not satisfactorily overcome the problems and thereby a risk in terms of traffic safety remains. Because of the risk, the European countries have denied the map display system and therefore they have not employed the map display system.
The arrow display system encounters the following two typical problems: In a case where the target direction is shown by an arrow as one of the display modes of the display device, the driver psychologically tends to perform earlier turns to the right or left in accordance with the shown arrow, causing a problem to arise, for example, the vehicle strays in a residential area. Furthermore, in a case where the course is instructed at an intersection as another display mode, timing at which traffic information collected in real time is indicated and acceptability for the drivers, which becomes a serious problem for the aged and female drivers, remain as unsolved problems, because there is a course instruction as the assumption.
According to a basic system design concept used for developing the conventional navigation system, the most important factor for the navigation system lies in that the present position of the user's vehicle, which is moving, is accurately recognized in a map (road map) which has been previously prepared. This system design concept is similarly applied to both the map display system and the arrow display system.
However, the conventional navigation system developed in accordance with the basic system design concept has been restricted by the system design concept and thereby it is of no practical use at present.
That is, since the vehicle such as an automobile moves at considerably high speed, it is not so practical for the driver even if the driver recognizes the present position of the vehicle as a point of low accuracy on the road map displayed on the display device. That is, it is rather acceptable for the driver who is driving the vehicle, in the aspects of the speed sensibility and the sense about the positional relationship and the directional relationship with respect to his target, that the driver recognizes the state of the vehicle's movement as a line while making the positional relationship with respect to the target clear than recognizing the present position indicated as a point, on the screen of the display device. It is easier and more natural for the driver to recognize the state of the vehicle's movement as the line tha
REFERENCES:
patent: 4743913 (1988-05-01), Takai
patent: 4928107 (1990-05-01), Kuroda et al.
patent: 5043902 (1991-08-01), Yokoyama et al.
Ian Catling and Peter Belcher, "Autoguide--Route Guidance in the United Kingdom", 1989, IEEE, pp. 467-473.
Fuminori Morisue and Ken Ikeda, "Evaluation of Map-Matching Techniques", 1989, IEEE, pp. 23-28.
Clyde B. Harris et al. "Digital Map Dependent Functions of Automatic Vehicle Location Systems;" IEEE Plans '88 Position Location and Navigation Symposium, Nov. 29-Dec. 2, 1988; pp. 79-87.
LandOfFree
Navigation system and method therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Navigation system and method therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Navigation system and method therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1268274