JP2000155033A - Position display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the development position of a map and a present display position in compliance with a moving speed so as to accurately display a present position by predicting a moving distance in a time required for indicating the present position from generation of position information. SOLUTION: A global positioning system(GPS) reception unit 101 receives GPS signal and output a position data, and the output signal is outputted to a CPU 112 via a communication interface 102. Output signals from a direction sensor 103 and a vehicle speed sensor 104 are outputted to the CPU 112 via an input interface 105. The CPU 112 computes a present position of a vehicle on the basis of inputted various signals, and the computed position information is displayed on a display 111 via a display processor 110. A moving distance during a time required for indicating the present position from generation of the position information is predicted, and on the basis of the generated position information and the predicted moving distance, a present position is computed and the computed present position is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position display device for appropriately displaying the current position of a moving object.

[0002]

2. Description of the Related Art Hitherto, there has been proposed a navigation device which provides guidance for driving a vehicle or the like so that a driver can easily reach a desired destination. Such a vehicle-mounted navigation device detects the position and orientation of a vehicle during traveling, reads map data around the vehicle position from a CD-ROM, draws a map image on a V-RAM, and displays the map image on the map image. , A vehicle position mark is drawn in a direction corresponding to the vehicle traveling direction at a position corresponding to the current position of
The image of the AM is output to a display device while being converted into a video signal and displayed on a screen. Then, as the current position changes with the movement of the vehicle, the map on the screen is fixed and moved only with the vehicle position mark, and conversely, the vehicle position mark is fixed at the center of the screen and the map is scrolled. The map information around the vehicle position can always be understood at a glance.

In such a vehicle-mounted navigation device, the vehicle position is detected by detecting a vehicle direction and a traveling distance using a direction sensor and a distance sensor during traveling, and detecting a position change every time the vehicle travels a predetermined distance. Self-contained navigation, which is obtained by successive accumulation, and G, which receives radio waves from Earth orbiting satellites (GPS satellites) and calculates the absolute position by the principle of triangulation.
There is PS hygiene navigation.

[0004]

However, in the conventional on-vehicle navigation device, when displaying the current position on the display device, it takes a long time from the acquisition of the position information to the display, so that it takes more time than the actual position. The previous information is displayed on the display device with a delay. The manner in which this display delay occurs will be described with reference to FIG.

FIG. 5 is a diagram showing the relationship between time and coordinates in a conventional vehicle-mounted navigation device. Assuming that the coordinates of the actual position of the own vehicle are (X, Y), the moving speed is S, and the processing time of the apparatus is Δt, during this Δt, the own vehicle
It moves by a distance of Δl = S × Δt. Therefore, when the coordinates (X, Y) are displayed, the own vehicle has already moved by a distance of Δl. This display delay increases as the moving speed increases. For this reason, there is a problem that the user incorrectly recognizes the current position of the vehicle. The present invention has been made in view of such a problem, and a position display device capable of correcting a map development position and a current display position according to a moving speed and accurately displaying a current position. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a radio signal is received, position information is obtained, and a distance traveled within a time required from the reception of the obtained radio signal to the display of a current position is determined. The current position is calculated based on the predicted and acquired position information and the predicted moving distance, and the calculated current position is displayed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A position display device according to a first aspect of the present invention comprises: position information output means for receiving a radio signal to generate position information; and display means for displaying the position information on a screen. A prediction means for predicting a distance to move within a time required from receiving the radio signal or generating the position information to displaying the current position, and a current determined based on the position information and the movement distance. A display control means for displaying a position on the display means.

[0008] A position display device according to a second aspect of the present invention is a position information output means for generating position information based on the acquired azimuth information and distance information, and displays the position information on a screen. Display means, prediction means for predicting the distance to move within the time required to acquire the azimuth information and distance information or to generate the position information and to display the current position, and the position information and the movement distance And a display control means for displaying the current position determined on the basis of the above on the display means.

With these configurations, even if the user moves between acquiring the position information and displaying it,
Since the current position can be displayed in consideration of the moving distance, an appropriate current position can be displayed for the user.

According to a third aspect of the present invention, in the position display device according to the first aspect or the second aspect, the position information output means divides the position information into a longitude component and a latitude component. Output, the display control means decomposes the moving distance information into a longitude component and a latitude component based on the azimuth information,
A configuration is adopted in which the longitude component and the latitude component of the position information are respectively added.

[0011] With this configuration, it is possible to use the processing method of the position information performed by the existing GPS or self-contained navigation navigation apparatus. The current position can be displayed.

According to a fourth aspect of the present invention, in the position display device according to any one of the first to third aspects, the prediction means dynamically changes the predicted movement distance in accordance with speed information. The configuration to change to is adopted.

With this configuration, it is possible to dynamically predict the moving distance in response to a change in speed and display the moving distance in consideration of the acquired position information. It can be displayed.

According to a fifth aspect of the present invention, in the position display device according to any one of the first to third aspects, the predicting means includes a comparing means for comparing a moving speed with a threshold value. If the moving speed is equal to or greater than the threshold, a first moving distance is output, and if the speed is less than the threshold, a second moving distance set to a value smaller than the first moving distance is output. And an output unit for outputting.

With this configuration, the moving distance information corresponding to the moving speed is stored in advance, the threshold value is compared with the current speed, and the moving distance is predicted using the moving distance information according to the comparison result. Therefore, it is not necessary to calculate the moving distance according to the speed, so that the processing load is reduced and the appropriate current position can be promptly displayed.

A position display method according to a sixth aspect of the present invention displays a current position after receiving a radio signal to generate position information, and receiving the radio signal or generating position information. Predict the distance to travel within the time required to
A configuration is employed in which a current position determined based on the position information and the moving distance is displayed.

Further, in a position display method according to a seventh aspect of the present invention, position information is generated based on the acquired azimuth information and distance information, and the azimuth information and the distance information are acquired or the position information is acquired. A configuration is adopted in which the distance traveled within the time required from the generation to the display of the current position is predicted, and the current position determined based on the position information and the travel distance is displayed.

With these configurations, even if the user moves between the time when the position information is obtained and the time when it is displayed,
Since the current position can be displayed in consideration of the moving distance, an appropriate current position can be displayed for the user.

Further, a navigation device according to an eighth aspect of the present invention employs a configuration in which the position display device according to any one of claims 1 to 5 is mounted.

With this configuration, even if the user has moved between the time when the position information was acquired and the time when the position information was displayed, the current position can be displayed in consideration of the moving distance, so that the user can be displayed. It is possible to display an appropriate current position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram showing an entire configuration of a vehicle-mounted navigation device according to Embodiment 1 of the present invention. The GPS receiving unit 101 is a GPS (Global)
Positioning System) signals are received to output position data, and the output signals are input to the communication interface 102. Communication interface 1
02 outputs data input from the GPS receiving unit 101 to a CPU described later.

The direction sensor 103 detects the traveling direction of the vehicle using geomagnetism, and the vehicle speed sensor 104 outputs pulse signals at time intervals proportional to the rotation speed of the output shaft in the transmission of the vehicle. The output signal of the direction sensor 103 and the output signal of the vehicle speed sensor 104 are input to a sensor input interface 105. The sensor input interface 105 outputs detection data input from the direction sensor 103 and the vehicle speed sensor 104 to a CPU described later.

The user performs various operations from the operation unit 106. The signal input from the operation unit 106 is
Parallel I / O 10 for detecting the presence or absence of an input signal from
The data is input to a CPU to be described later via a. Also, CD /
The DVD-ROM 108 stores digital map data, and stores a DMA (Direct Memory Ac).
The controller 109 reads information stored in the CD / DVD-ROM 108 under the control of a CPU described later. The display processor 110 displays a map image on the display 111.

The CPU 112 calculates the current position of the vehicle based on various input signals, and outputs the calculated position information to the display 11 via the display processor 110.
1 is displayed. This allows the user to know the current position of the vehicle on the map. Also, the memory 11
Reference numeral 3 includes a ROM that stores a program that defines the processing content of the CPU 112, various tables, and the like, and a RAM that is used as a work area when the CPU 112 performs processing.

Next, the concept of correcting the display position in the vehicle-mounted navigation device according to Embodiment 1 of the present invention configured as described above will be described with reference to FIG. FIG. 2 is a diagram illustrating a positional relationship between an actual position and a display position. Here, in the vehicle-mounted navigation device according to Embodiment 1 of the present invention, the time required to display the map is Δt, the longitude of the position of the vehicle is X, the latitude is Y, the direction is θ, and the moving speed is S. And At this time, when the current vehicle position is displayed on the display device, a delay of Δt always occurs. Here, it is assumed that the traveling direction within a unit time is constant.

In FIG. 2, assuming that the distance traveled by the vehicle during Δt is Δl, the travel distance can be obtained by Δl = S × Δt (1).

When this is decomposed into longitude and latitude components,
The longitude Δx and the latitude Δy moving during Δt are represented by the following equations. Δx = Δlcosθ, Δy = Δlsinθ (2)

As described above, the corrected longitude hx and latitude hy at the display position of the own vehicle are represented by the following equations. hx = X + Δx, hy = Y + Δy (3)

As described above, by using the speed of the own vehicle at the time of correction, an appropriate correction value corresponding to the speed can be obtained. Also, even if the speed is high,
Since it is considered that the change in the azimuth of the own vehicle per unit time is small, the correction value can be obtained without any inconvenience by the above calculation formula.

Next, the operation of correcting the display position in the vehicle-mounted navigation device according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 3 is a flowchart of a display position correcting operation in the vehicle-mounted navigation device according to the first embodiment. First, the vehicle position information is acquired (step S1). That is, the longitude, the latitude, the traveling direction, and the moving speed are reported by the GPS receiving unit 101 and the direction sensor 10.
3. Input from the vehicle speed sensor 104. Next, the processing time Δ
The movement distance Δl between t is obtained (step S2). This Δ
A longitude component Δx and a latitude component Δy are obtained from 1 and the traveling direction (step S3). Finally, display coordinates (hx, hy) are calculated by adding Δx and Δy to the actual position longitude X and latitude Y (step S4).

As described above, the vehicle-mounted navigation device according to Embodiment 1 of the present invention displays the current position using the coordinates corrected according to the moving distance in the display time lag when displaying the position. Therefore, an accurate current position without delay can be displayed.

(Embodiment 2) Next, a vehicle-mounted navigation device according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is an operation flowchart of the on-vehicle navigation device according to Embodiment 2 of the present invention. First, the vehicle position information is acquired by the GPS receiving unit (step T1). Next, the current moving speed is detected (step T2), and the detected moving speed is compared with a predetermined threshold (steps T3 and T4). As a result of this comparison, if the detected moving speed is equal to or higher than the predetermined threshold, the first moving distance information stored in advance is read from the memory (step T5). On the other hand, if the detected moving speed is lower than the predetermined threshold (step T4), the second moving distance information stored in advance is read from the memory (step T6). Next, the read travel distance is added to the acquired position information (step T7).

As described above, according to the vehicle-mounted navigation device according to the second embodiment of the present invention, the moving distance information corresponding to the moving speed is stored in advance, and the threshold is compared with the current speed. Since the moving distance can be predicted using the moving distance information according to the comparison result, there is no need to calculate the moving distance according to the speed, thereby reducing the processing load and promptly displaying the appropriate current position. It becomes possible.

[0034]

As is clear from the above description, according to the present invention, even if the user moves between the time when the position information is acquired and the time when the position information is displayed, the distance is taken into account in consideration of the moving distance. Since the current position can be displayed, an appropriate current position can be displayed to the user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a vehicle-mounted navigation device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a positional relationship between an actual position and a display position in the vehicle-mounted navigation device according to the first embodiment of the present invention.

FIG. 3 is a flowchart of a display position correcting operation in the vehicle-mounted navigation device according to the first embodiment of the present invention.

FIG. 4 is an operation flowchart of the vehicle-mounted navigation device according to the second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between time and coordinates in a conventional vehicle-mounted navigation device.

[Explanation of symbols]

 101 GPS receiving unit 102 Communication interface 103 Direction sensor 104 Vehicle speed sensor 105 Sensor input interface 106 Operation unit 107 Parallel I / O 108 CD / DVD-ROM 109 DMA controller 110 Display processor 111 Display 112 CPU 113 Memory

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F029 AA02 AB07 AB13 AC02 AD05 5H180 AA01 BB04 BB13 CC12 FF04 FF05 FF07 FF22 FF27 FF32 FF33

Claims (8)

[Claims] 1. A position information output means for receiving a wireless signal to generate position information, a display means for displaying the position information on a screen, Prediction means for predicting a distance to move within a time required to display a position, and display control means for displaying a current position determined based on the position information and the movement distance on the display means. Characteristic position display device. 2. A position information output means for generating position information based on the acquired direction information and distance information, a display means for displaying the position information on a screen, and acquiring the direction information and distance information. Or, a prediction unit for predicting a distance to move within a time required from the generation of the position information to a display of the current position, and a current position determined based on the position information and the movement distance is displayed on the display unit. A position display device, comprising: display control means for causing the display device to perform a position control. 3. The position information output means outputs the position information divided into a longitude component and a latitude component, and the display control means converts the movement distance information into a longitude component and a latitude component based on the azimuth information. 3. The position display device according to claim 1, wherein the position information is decomposed and added to a longitude component and a latitude component of the position information. 4. The apparatus according to claim 1, wherein said predicting means dynamically changes a predicted moving distance according to speed information.
The position display device according to any one of claims 1 to 3. 5. The predicting unit outputs a first moving distance when the moving speed is equal to or higher than the threshold, and a comparing unit that compares the moving speed with a threshold, and the speed is lower than the threshold. 4. The position display device according to claim 1, further comprising: an output unit that outputs a second movement distance set to a value smaller than the first movement distance. 6. A method for receiving a wireless signal to generate position information,
Predict the distance to move within the time required from receiving the radio signal or generating the position information to displaying the current position, and displaying the current position determined based on the position information and the movement distance A position display method characterized by the above-mentioned. 7. Within a time period required for generating position information based on the acquired azimuth information and distance information and acquiring the azimuth information and distance information or generating the position information and displaying the current position. And a current position determined based on the position information and the moving distance is displayed. 8. A navigation device equipped with the position display device according to claim 1.