JPH0771971A - Map guidance system - Google Patents

Abstract

PURPOSE:To enable any general atlas to be used with a map guidance system that makes use of a GPS and the like. CONSTITUTION:Using a key on the front panel of a GPS receiving unit 101, a user enter inputs the scale of the map used and designates as a preset position 106 a position on an atlas 105 which corresponds to the name of a reference location which an LCD 102 displays, with a transmission type LCD panel 103 placed on the atlas 105. The preset position 106 being displayed, and the latitude and longitude of the reference location corresponding to the position, are stored in a memory, etc. Thereafter, the GPS receiving unit 101 calculates the latitude and longitude of the receiving point in accordance with data superimposed on a radio wave received from a GPS satellite by means of a GPS antenna, and displays a dot 104 corresponding to the receiving point on the transmission type LCD panel 103 using the calculation result, the preset position 106 displayed, and the latitude and longitude of the reference location corresponding to the position 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to GPS (Global Position
ionizing system: a wide area positioning system) and the like.

[0002]

2. Description of the Related Art GPS is based on data superimposed on radio waves transmitted from 24 artificial satellites launched by the US Department of Defense into six orbits of the earth, and the latitude and longitude of the point where the data is received. It is a system that can know altitude, time, etc. A vehicle-mounted or portable position measuring device (navigation system) using GPS has been put into practical use.

As a concrete prior art of such a position measuring device, a receiving point (current position) calculated by using GPS
In some cases, the digital map data stored in the recording medium is read based on the latitude and longitude information, and a map image is displayed on the display screen based on the map data to notify the user of the reception point.

As a recording medium, a CD-ROM or IC
-ROM cards etc. are used. However, for general users who do not drive all over the country,
A position measuring device equipped with a CD-ROM device is provided because of the hardware cost of the CD-ROM device main body and C
It is uneconomical considering the cost of providing the D-ROM software (map data).

On the other hand, in the position measuring device employing the IC-ROM card, the service capacity of the IC-ROM card is limited due to the limited memory capacity of the IC-ROM card.

In addition, any of the prior arts requires a display device for displaying a map image, and an increase in cost due to that is inevitable. Therefore, as another conventional technique for solving the above-mentioned problems, based on the latitude and longitude information of the receiving point calculated using GPS,
2. Description of the Related Art There is a device that informs a user of a receiving point by displaying dots on a transmissive display device placed on a map book, which is a book.

In this conventional technique, since the digital map data is not required, a recording medium for storing the data is not required, and the device cost can be kept low. Further, since the map book is provided as a book, it has a feature that it can provide maps with various accuracy.

[0008]

However, in the above-mentioned conventional technique using a map book which is a book, it is necessary to provide a map book dedicated to the guide by GPS, and the dedicated map book is required. There is a problem in that the cost is increased.

An object of the present invention is to make it possible to use a general map book in a map guide using GPS or the like.

[0010]

The present invention firstly has a transmissive display means such as a transmissive LCD panel. Next, there is a scale input means (display position calculation unit 609, scale / reference place display processing unit 611) for inputting the scale of a map book on which the transparent display unit is placed.

Further, it has a position information calculating means for calculating the position information of an arbitrary point. This means is a GPS receiving device that calculates the position information of the reception point of the radio wave based on the radio wave from the GPS satellite or the like.

Next, for each of the plurality of reference locations,
Reference place information storage means (reference place table storage unit that stores a reference place table) that stores the name of the reference place, range information indicating a range including the reference place, and position information indicating the position of the reference place. 610).

Further, by referring to the reference place information storing means using the position information calculated by the position information calculating means, the name of the reference place including the current position information as a range and the reference place for calculating the position information. It has a calculation means (display position calculation unit 609).

Further, it has a reference place name display means (scale / reference place display processing section 611) for displaying the name of the reference place calculated by the reference place calculation means. Further, it has a preset position designating unit (display position computing unit 609) for designating the reference place displayed by the reference place name displaying unit as a preset position on the transmissive display unit placed on the map book.

In addition, the information indicating the display position on the transmissive display means corresponding to the preset position designated by the preset position designating means and the position information of the reference location calculated by the reference location calculating means are preset. Preset position information storage means for storing as position information (display position calculation unit 60
9, work RAM).

Then, based on the position information sequentially calculated by the position information calculating means and the preset position information,
The transmissive display unit has a display control unit (display position calculation unit 609, transmissive display processing unit 612) that gives a display instruction to a display position corresponding to the calculated position information. In this case, when the display position corresponding to the calculated position information exceeds the display range of the transmissive display unit, the display control unit displays the display position corresponding to the calculated position information on the transmissive display unit. It can be configured to display the protruding direction.

[0017]

The user inputs the scale of the map book to be used by the scale input means. Next, the user opens the map book page containing the current location, and then places the transparent display unit on the page.

The position information calculating means calculates position information (latitude, longitude, etc.) of the current location, for example. Next, the reference place calculating means calculates the name and position information of the reference place in which the position information is included as a range by referring to the reference place information storing means using the position information of the present location, and the name is used as a reference. It is displayed on the place name display means.

The user, by the preset position designating means, on the transparent display means placed on the map book,
The reference place displayed by the reference place name display means is designated as a preset position. The preset position information storage means stores the position information of the current reference place corresponding to the preset position as the preset position information.

After that, the display control means instructs the transmissive display means to display at the display position corresponding to the calculated position information, based on the position information sequentially calculated and the preset position information.

In this way, if the user uses a commercially available map book and designates a preset position corresponding to the name of the reference place currently displayed by the reference place name display means, the map book is displayed. The position information can be recognized accurately above.

When the display position corresponding to the calculated position information goes out of the transmissive display means, the display control means causes the transmissive display means to correspond to the calculated position information. Display the direction in which the display position extends. This allows the user to recognize the position of the map book to be referred to next.

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an external view of the embodiment.

First, the user turns on the power of the GPS receiving device 101 and then operates the scale up key 204 and the scale down key 205 shown in FIG. 2 provided on the front panel of the GPS receiving device 101 for use. Atlas 105
Enter the scale of. The input reduced scale is displayed on an LCD (liquid-crystal display) 102 provided on the front panel of the GPS receiver 101, as illustrated in FIG.

Next, the user opens the page of the map book 105 including the current location as shown in FIG. 4, for example, and then puts the transmissive LCD panel 103 on the page. GPS
The reception device 101 calculates the latitude and longitude corresponding to the reception point (current position) based on the data superimposed on the radio waves from the GPS satellites received using a GPS antenna (not shown). Next, the GPS receiving device 101 uses the calculation result and the IC-RO inserted in the slot 108.
By referring to the reference place table (see FIG. 10 described later) corresponding to the map book 105 stored in the M card 107, the reference place near the receiving point is calculated, and the reference place name is illustrated in FIG. Is displayed on the LCD 102.

The user operates the cursor key 20 shown in FIG. 2 provided on the front panel of the GPS receiver 101.
1 is used to move the preset position 106 displayed on the transmissive LCD panel 103 to a position on the map book 105 corresponding to the reference place displayed on the LCD 102 (for example, "Kuroiso station" in FIG. 4). After that, the GPS receiver 1
Press the preset key 202 shown in FIG. 2 provided on the front panel of 01. The GPS receiver 101 stores the latitude / longitude data of the reference place read from the reference place table and the display position data of the preset position 106 on the transmissive LCD panel 103.

After that, in response to the movement of the receiving point, the GPS receiving apparatus 101 corresponds to the receiving point (current position) based on the data superimposed on the radio wave from the GPS satellite received using a GPS antenna (not shown). Calculate latitude and longitude. Then, the GPS receiving device 101 uses the calculated latitude and longitude of the receiving point, the stored latitude and longitude of the reference place, and the display position of the preset position 106 on the transmissive LCD panel 103, Transmission type L
The dot 104 corresponding to the receiving point (current position) is displayed on the CD panel 103. That is, the transmissive LCD panel 103
The display above is as shown in FIG. 5 (a).

When the display position of the dot 104 corresponding to the receiving point goes out of the transmissive LCD panel 103, the GPS receiving device 101 displays, for example, as shown in FIG. The direction of the reception point deviated from the transmissive LCD panel 103 is displayed as an arrow on the transmissive LCD panel 103.

When the user changes the reference place name displayed on the LCD 102, the user can press the reset key 20 shown in FIG. 2 provided on the front panel of the GPS receiver 101.
The preset position 106 can be reset by pressing 3, and the scale-up key 20 shown in FIG. 2 provided on the front panel of the GPS receiver 101 can be reset.
4 and the scale down key 205, the scale of the map book 105 to be used can be arbitrarily changed.

Further, in FIG. 1, the transmissive LCD panel 103 can be easily realized as a liquid crystal display panel used in various electronic equipments and the like, except for a reflection plate arranged on the back surface thereof.

FIG. 6 is a block diagram of the GPS receiver 101 of FIG. The GPS receiving device 101 includes a receiving unit 601 and a data processing unit 602.

In the receiving section 601, the high frequency amplifier circuit 6
03 amplifies the high frequency received by the GPS antenna. The frequency conversion / amplification circuit 604 converts the amplified high frequency into an intermediate frequency and then amplifies it.
Then, the spectrum despreading / demodulation circuit 605 demodulates the C / A code data which is spectrum-spread in the intermediate frequency.

In the data processing unit 602, the orbit data collection unit 606 includes a position (latitude, longitude, and longitude) of each satellite included in the C / A code data for each satellite output from the spectrum despreading / demodulation circuit 605. Orbit data showing altitude) is collected. The distance measuring unit 607 extracts the pseudo distance between each satellite and the receiving point based on the information indicating the transmission timing of the data extracted from the C / A code data for each satellite output from the spectrum despreading / demodulation circuit 605. Distance data indicating (described later) is calculated. The position calculation unit 608 uses the orbital data indicating the three-dimensional position of each satellite collected by the orbital data collection unit 606 and the distance data indicating the pseudo distance between each satellite measured by the distance measuring unit 607 and the receiving point. Based on this, the latitude, longitude, and altitude of the receiving point are calculated.

Further, in the data processing unit 602, the display position calculation unit 609 stores the above-mentioned reduced scale input by the user in a work RAM (not shown).
The reference point table storage unit 6 stores the reference points near the current reception point.
10, the operation of storing the preset position 106 (FIG. 1) input by the user in the work RAM, and the latitude / longitude data of the reception point calculated by the position calculation unit 608 and the work RAM. Based on the information on the preset position 106 thus obtained, the operation for calculating the display position of the dot 104 on the transmissive LCD panel 103 is performed. Further, the scale / reference place display processing unit 611 causes the LCD 102 (FIG. 1) to display the scale and reference place name determined or calculated by the display position calculation unit 609. Further, the transmissive display processing unit 612 is provided on the transmissive LCD panel 103.
The preset position 106 and the dot 104 corresponding to the latitude / longitude data of the reception point are displayed.

Here, in the data processing unit 602, the reference place table storage unit 610 is, for example, I inserted in the slot 107 provided in the GPS receiver 101 of FIG.
The C-ROM card 106 stores a reference place table. Other parts of the data processing unit 602 are, for example, the work R built in by the microcomputer.
While using AM as a work area, it has a built-in R
It is realized as a function of executing the control program stored in the OM.

The operation of the embodiment having the above configuration will be described below. First, each GPS satellite Si includes information C indicating the current position (latitude θi, longitude ψi, altitude ri) on spherical coordinates with the center of the earth as the origin.
The / A code is spectrum-spread to a high frequency of 1575.42 MHz and transmitted at accurate transmission timing synchronized with the atomic clock built in each GPS satellite.

Each high frequency wave from any four of the plurality of GPS satellites Si is received by a GPS antenna (not shown) at the receiving point where the user is, and then the receiving unit 60 of FIG.
It is amplified by the high frequency amplifier circuit 603 in 1
The amplification circuit 604 converts and amplifies to an intermediate frequency. Then, in the spectrum despreading / demodulation circuit 605, each C / A spectrum-spread from these intermediate frequencies is spread.
Code data is demodulated. Since each C / A code data is assigned a specific type of code corresponding to each GPS satellite Si in advance, the received C / A code indicates which four types of GPS satellites Si (1≤i). It is easy to determine whether or not the code corresponds to ≦ 4).

On the other hand, the data processing unit 602 of FIG. 6 executes the operations shown in the operation flowcharts of FIGS. 7, 8 and 9. First, a diagram for calculating the latitude / longitude data of the receiving point (current position) based on the C / A code received by the receiving unit 601 among the processes of the operation flowcharts of FIGS. 7, 8 and 9. The processing of steps S704 to S709 of No. 7 will be described.

In step S704, the receiving unit 601
It is determined whether or not a radio wave from the GPS satellite Si has been received. If this determination is NO, in step S705, the operation of holding the display of the LCD 102 and the transmissive LCD panel 103 of FIG. 1 is executed, and then, step S704 again.
Is executed.

If the determination in step S704 is YES, then in step S706 the C / A of the four types of GPS satellites Si output from the spectrum despreading / demodulation circuit 605.
Code data is fetched and stored in a work RAM (not shown).

Subsequently, step S707 corresponds to the function of the trajectory data collection unit 606 of FIG. Here, it is included in the C / A code data of the four types of GPS satellites Si stored in the work RAM in step S706.
Current position of four types of satellites (latitude θi, longitude ψi, altitude r
i) (1 ≦ i ≦ 4) trajectory data is collected and stored in the work RAM.

Further, step S708 corresponds to the function of the distance measuring section 607 of FIG. Here, first, four types of GPS stored in the work RAM in step S706.
Based on each of the C / A code data of satellite Si,
Each GPS satellite S of each C / A code data based on the atomic clock built in each GPS satellite Si synchronized with each other
Propagation delay time ti (1 ≦ i ≦ 4), which is the time difference between the transmission timing from i and the reception timing of each C / A code data based on a reference clock (not shown) built in the data processing unit 602. Is calculated. Next, the propagation delay times ti (1≤i≤4) are multiplied by the speed of light C, respectively, to obtain the respective GPS satellites Si (1≤i≤).
4) and the distance di between the receiving point and di (1≤i≤4) is calculated,
It is stored in the work RAM. Here, a predetermined error time .DELTA.t is superimposed on the atomic clock contained in each GPS satellite Si which is synchronized with each other in the reference clock of the receiving point.
Therefore, the above-mentioned distance di (1≤i≤4) is
This is called the pseudorange, not the true distance between the satellite Si (1≤i≤4) and the receiving point.

Next, step S709 corresponds to the function of the position calculator 608 of FIG. Here, the orbital data indicating the current position (latitude θi, longitude ψi, altitude ri) (1 ≦ i ≦ 4) of the four types of GPS satellites Si collected by the orbital data collection unit 606 and stored in the work RAM, and the distance. Each GPS measured by the measuring unit 607 and stored in the work RAM
The position of the receiving point (latitude θ, longitude ψ, altitude r) is calculated based on the satellite Si and the distance data indicating the pseudo distance di (1 ≦ i ≦ 4) between the receiving point.

The principle of calculating the position of the receiving point will be described below. First, as described above, the pseudo distance di (1≤i≤4) between each GPS satellite Si and the receiving point is the true distance D.
The distance corresponding to the error time Δt of the reference clock at the receiving point is added to i (1 ≦ i ≦ 4). Then, the true distance Di is determined by each GPS satellite Si.
Is equal to the Euclidean distance between the current position of and the position of the receiving point. Therefore, the coordinate values representing the current position of each GPS satellite Si and the position of the receiving point on the three-dimensional Cartesian coordinate system are (Xi, Yi, Zi) and (X, Y, Z), respectively, and C is the speed of light. Then, the following equation is established.

[0045]

[Equation 1] Di ² = (di −C · Δt) ² = (Xi −X) ² + (Yi −Y) ² + (Zi −Z) ² = Xi ² + Yi ² + Zi ² + X ² + Y ² + Z ² − 2 (Xi X + Yi Y + Zi Z) (1≤i≤4) In this case, the following equations hold for the current position of each GPS satellite Si and the position of the receiving point.

[0046]

## EQU2 ## Xi ² + Yi ² + Zi ² = ri ² Xi = ri ・ sin θi ・ cos ψi Yi = ri ・ sin θi ・ sin ψi Zi = ri ・ cos θi (1 ≦ i ≦ 4) X ² + Y ² + Z ² = R ² X = r · sin θ · cos ψ Y = r · sin θ · sin ψ Z = r · cos θ Substituting this equation 2 into the equation 1, the following equation is obtained.

[0047]

(D i −C · Δt) ² = r i ² + r ² −2 r i r (sin θi · cos ψi · sin θ · cos ψ + sin θi · sin ψi · sin θ · sin ψ + cos θi · cos θ) ( 1 ≦ i ≦ 4) In the above equation 3, the pseudo distance di (1 ≦ i ≦ 4) is calculated in step S708, and the current positions (θi, ψi, ri) (1) of the four types of GPS satellites Si are calculated. ≦ i ≦ 4)
Have been extracted as orbital data in step S707. Therefore, there are a total of four unknowns in the equation (3): the position (θ, ψ, r) of the receiving point and the error time Δt of the reference clock at the receiving point.

Therefore, in step S709, any 4
By solving the quaternary simultaneous equations shown in Formula 3 determined based on the data from one GPS satellite Si, the position (θ, ψ, r) of the receiving point and each GPS satellite synchronized with each other The error time Δt of the reference clock at the receiving point is calculated with respect to the atomic clock built in Si, and among them, θ and ψ are stored in the work RAM as latitude / longitude data.

Next, the overall operation of the operation flowcharts of FIGS. 7, 8 and 9 will be described. Step S701 is
This corresponds to the function of the display position calculation unit 609 in FIG. Here, the work R (not shown) in the data processing unit 602 is not shown.
The contents of AM etc. are initialized. In particular, a preset flag in the work RAM described later is set.

Next, step S702 corresponds to the functions of the display position calculation unit 609 and the scale / reference place display processing unit 611 of FIG. Here, the user selects the scale-up key 2
04 and the scale down key 205 (FIG. 2) are operated to determine whether or not the scale of the map book 105 to be used has been set. In this case, the reduced scale display on the LCD 102 is also changed. If the user presses the preset key 202 (FIG. 2) after performing this operation, the determination in step S702 is YES.

Further, step S703 also corresponds to the functions of the display position calculation unit 509 and the scale / reference place display processing unit 611 of FIG. Here, scale data corresponding to the input scale is stored in a work RAM (not shown), and the scale is simultaneously displayed on the LCD 102.

Then, based on the C / A code from the GPS satellite Si (1≤i≤4), the above-mentioned step S70 is performed.
By the processing of 4 to S709, the latitude of the receiving point (current location)
Longitude data is calculated.

Next, step S710 of FIG. 8 corresponds to the functions of the display position calculation unit 609 and the transmissive display processing unit 612 of FIG. Here, the reference place near the current receiving point calculated in step S709 is read from the reference place table storage unit 610, and the name of the reference place is displayed on the LCD 10.
It is displayed in 2. FIG. 10 shows an example of the data structure of the reference place table. In the reference place table, for example, for each representative reference place in Japan or in a specific area, data indicating a range of latitude / longitude in the vicinity of the reference place and latitude / longitude data of the reference place are stored. Has been done. In step S710, it is searched whether the latitude / longitude data of the current reception point calculated in step S709 falls within the latitude / longitude range corresponding to the reference location in the reference location table, and the corresponding reference is obtained. The name of the place and the latitude / longitude data are read.

Next, step S711 corresponds to the function of the display position calculation unit 609 of FIG. Here, work R
It is determined whether or not the preset flag stored in the AM is set.

The preset flag is set in step S7 of FIG.
Since it is set to 01, the first step is S71.
The determination of 1 is YES. Next, in step S712,
The display position calculation unit 609 and the transmissive display processing unit 61 of FIG.
It corresponds to the function of 2. Here, the preset position 106
Is displayed in the center of the transmissive LCD panel 103 (FIG. 1).

Thereafter, until it is determined in step S715 that the user has pressed the preset key 202 (FIG. 2),
Step S7 of determining whether the user has changed the preset position 106 with the cursor keys 201 (FIG. 2)
The process of 13 is repeatedly executed. Step S713 is
This corresponds to the function of the display position calculation unit 609 in FIG.

When the user changes the preset position 106 with the cursor key 201 (FIG. 2), step S7
The determination result of 13 is YES, and in step S714, the display position of the preset position 106 on the transmissive LCD panel 103 is changed according to the changing operation. Step S
Reference numeral 714 corresponds to the functions of the display position calculation unit 609 and the transmissive display processing unit 612 in FIG.

After that, the procedure returns to the determination processing of step S713 again. When the user presses the preset key 202, the determination in step S715 is YES. As a result, in step S716, the transmission type L corresponding to the preset position 106 is
The display position on the CD panel 103 and the preset position 106 read from the reference place table in step S710.
The latitude / longitude data of the reference place corresponding to is stored in a work RAM (not shown). Then, step S7
At 17, the preset flag is reset. Step S
715, S716, and S717 correspond to the function of the display position calculation unit 609 in FIG.

After this, unless the user performs the preset operation again, the preset flag remains reset, so the determination in step S711 is NO,
Steps S712 to S717 are skipped.

Then, each time the C / A code is received from the GPS satellite Si (1≤i≤4), the above-described processing of steps S704 to S709 of FIG. 7 and step S7 of FIG. 8 are performed.
The process of retrieving the reference place corresponding to the current reception point of 10 from the reference place table and displaying it on the LCD 102 and the process of steps S718 to S725 of FIG. Corresponding dot 104
Is displayed on the transmissive LCD panel 103.

That is, first, step S718 corresponds to the function of the display position calculation unit 609 of FIG. Here, the latitude / longitude data of the reception point calculated in the processing of steps S704 to S709 of FIG. 7 and stored in the work RAM, and the preset position 106 stored in the work RAM.
Reception on the transmissive LCD panel 103 using the latitude / longitude data of the reference location corresponding to the position and the display position data of the preset position 106 on the transmissive LCD panel 103, and the scale data stored in the work RAM. The display position of the dot 104 corresponding to the point (current position) is calculated.
Then, it is determined whether or not this calculated position is within the frame of the transmissive LCD panel 103.

If this determination is YES, step S719
Then, the dot 104 is displayed at the display position calculated in step S718 on the transmissive LCD panel 103 (see FIG. 5B). Step S719 corresponds to the function of the transmissive display processing unit 612 in FIG.

On the other hand, the display position of the dot 104 corresponding to the receiving point goes out of the transmissive LCD panel 103,
When the determination in step S718 is NO, in step S720, the direction of the reception point deviated from the transmissive LCD panel 103 is displayed as an arrow on the transmissive LCD panel 103 ((c) in FIG. 5). reference). This step S7
20 also corresponds to the function of the transmissive display processing unit 612 in FIG.

Next, step S721 corresponds to the function of the display position calculation unit 609 of FIG. Here, it is determined whether or not the user has pressed the reset key 203 in FIG.

If this determination is YES, step S
At 722, the display of the preset position 106 and the dot 104 on the transmissive LCD panel 103 is erased, the preset flag is set at step S723, and then the process jumps to step S711 of FIG.
When the determination result of 1 is YES, the user operates to input the preset position 106 again. Step S722 corresponds to the function of the transmissive display processing unit 612 in FIG. 6, and step S723 is the display position calculation unit 6 in FIG.
It corresponds to the function of 09.

If the determination in step S721 is NO, it is determined in step S724 whether the scale has been changed by pressing the preset key 202 after the user operated the scale up key 204 or the scale down key 205 shown in FIG. Is determined. Step S724 corresponds to the function of the display position calculation unit 609 in FIG.

If this determination is YES, step S
At 725, scale data corresponding to the scale changed by the user is stored in a work RAM, which is not particularly shown, and the changed scale is displayed on the LCD 102. In step S725, the display position calculation unit 609 of FIG.
And the function of the scale display processing unit 611.

After that, the process jumps to the process of step S718, and the position of the new dot 104 is recalculated according to the changed scale. If the determination in step S724 is no, the process jumps to step S704 in FIG. 7 and the next C / A code is received from the GPS satellites Si (1 ≦ i ≦ 4). S704-
The processing of S709, step S710 of FIG. 8, and FIG.
The processing of steps S718 to S725 is repeatedly executed, and the dot 104 corresponding to the reception point (current position) is displayed on the transmissive LCD panel 103.

In the above-described embodiment, when the user inputs the preset position 106, the user moves the display position of the preset position 106 by using the cursor key 201 shown in FIG. 2. However, for example, the transmissive LCD panel 103 has a touch panel function. Alternatively, the preset position 106 may be designated on the transmissive LCD panel 103 by touching.

In the embodiment described above, the present position is calculated based on the radio waves from the GPS satellites. However, the present position may be, for example, a beacon that is expected to be maintained in the future. Alternatively, the calculation may be performed by another method such as a method using public FM broadcast waves.

[0071]

According to the present invention, a commercial map book can be created by inputting a scale to the map book to be used and a preset position corresponding to the name of the displayed reference place. By using it, it becomes possible to accurately recognize the position information.

Further, when the display position corresponding to the calculated position information goes out of the transmissive display means, the protruding direction is displayed on the transmissive display means. It becomes possible to recognize the position of the atlas which should be.

[Brief description of drawings]

FIG. 1 is an external view of an example.

FIG. 2 is a configuration diagram of a front panel.

FIG. 3 is a diagram showing an example of reduced scale display.

FIG. 4 is a diagram showing an example of a map book.

FIG. 5 is an operation explanatory diagram of the embodiment.

FIG. 6 is a configuration diagram of a GPS receiving device.

FIG. 7 is an operation flowchart (1) of the embodiment.

FIG. 8 is an operation flowchart (2) of the embodiment.

FIG. 9 is an operation flowchart (3) of the embodiment.

FIG. 10 is a diagram showing an example of a reference place table. 101 GPS receiver 102 LCD 103 Transmissive LCD panel 104 Dot 105 Atlas 106 Preset position 107 IC-ROM card 108 Slot 201 Cursor keys 202 Preset key 203 Reset key 204 Scale up key 205 Scale down key 601 Receive unit 602 Data processing unit 603 high-frequency amplification circuit 604 frequency conversion / amplification circuit 605 spectrum despreading / demodulation circuit 606 orbit data collection unit 607 distance measurement unit 608 position calculation unit 609 display position calculation unit 610 reference place table storage unit 611 scale / reference place display processing unit 612 Transmissive display processing unit

Claims (3)

[Claims] 1. A transmissive display unit, a scale input unit for inputting a scale of a map book on which the transmissive display unit is placed, a position information calculation unit for calculating position information of an arbitrary point, and a plurality of standards. For each of the places, the name of the reference place,
A reference place information storage unit that stores range information indicating a range including the reference place and position information indicating a position of the reference place, and the reference using the position information calculated by the position information calculating unit. By referring to the geographic information storage means, the name of the reference place in which the current position information is included as a range and the reference place calculation means for calculating the position information, and the name of the reference place calculated by the reference place calculation means A reference place name display means for displaying, and on the transparent display means placed on the map book,
A preset position designating means for designating a reference location displayed by the reference location name display means as a preset position, and a display position on the transmissive display means corresponding to the preset position designated by the preset position designating means are shown. Information and position information of the reference place calculated by the reference place calculating unit, preset position information storage unit for storing as preset position information, the position information sequentially calculated by the position information calculating unit, A map guide device, comprising: display control means for giving a display instruction to the transmissive display means at a display position corresponding to the calculated position information based on the preset position information. 2. The display control means causes the transmissive display means to display, when a display position corresponding to the calculated position information is out of a display range of the transmissive display means.
The map guide device according to claim 1, wherein a direction in which a display position corresponding to the calculated position information extends is displayed. 3. The map guide according to claim 1, wherein the position information calculation means calculates position information of a reception point of the radio wave based on the radio wave from the satellite. apparatus.