JPH0771969A - Map guide device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to make a general map book available for a map guide device using GPS or the like. [Structure] A user inputs a scale of a map to be used by using a key on a front panel of the GPS receiver 101, and a map book 105 on which a transmissive LCD panel 103 is placed.
The current position above is designated as the preset position 106.
The display position of the preset position 106 and the latitude / longitude at the designated time are stored in a memory or the like. afterwards,
The GPS receiver 101 calculates the latitude and longitude of the reception point based on the data superimposed on the radio waves from the GPS satellites received using the GPS antenna, and the calculation result, the display position of the preset position 106, and the latitude / longitude. Using
The dots 104 corresponding to the reception points are displayed on the transmissive LCD panel 103.

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 display processing unit 611) for inputting the scale of the 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, on the transmissive display means placed on the map book, the preset position designating means (display position) for designating the present position as the preset position by the function of the cursor key or the touch panel of the transmissive display means. It has a calculation unit 609).

Information indicating a display position on the transmissive display means corresponding to the preset position designated by the preset position designating means, and a position calculated by the position information calculating means corresponding to the preset position at the time of designation. And a preset position information storage unit (preset position storage unit 610) that stores the information as preset position information.

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.

[0015]

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.

Subsequently, the user designates the present position as the preset position on the transparent display unit placed on the map book by the preset position designation unit. The preset position information storage unit presets information indicating a display position on the transmissive display unit corresponding to the preset position and position information calculated by the position information calculation unit corresponding to the preset position when the preset position is stored. It is stored as 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, the user can accurately recognize the position information by using a commercially available map book.
When the display position corresponding to the calculated position information goes out of the transmissive display unit, the display control unit causes the transmissive display unit to display the display position corresponding to the calculated position information. Display the protruding direction. This allows
The user can recognize the position of the map book to be referred to next.

[0019]

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, after turning on the power of the GPS receiver 101, the user operates the scale up key 204 and the scale down key 205 shown in FIG. 2 provided on the front panel of the GPS receiver 101 to use it. 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, for example, as shown in FIG. 4, and then puts the transmissive LCD panel 103 on the page. Subsequently, the user is currently at the preset position 106 displayed on the transmissive LCD panel 103 by using the cursor key 201 shown in FIG. 2 provided on the front panel of the GPS receiving device 101. After moving to a position on the map book 105 corresponding to the point (for example, “Kuroiso Station” in FIG. 4), the preset key 202 shown in FIG. 2 provided on the front panel of the GPS receiver 101 is pressed.

On the other hand, the GPS receiver 101 is
First, the latitude and longitude of the current position corresponding to the preset position 106 are calculated and stored based on the data superimposed on the radio waves from the GPS satellites received using a GPS antenna (not shown).

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 preset position 106, and the display position on the transmissive LCD panel 103 to transmit the transmissive LCD. Dot 104 corresponding to the receiving point (current location) on panel 103
Is displayed. That is, the display on the transmissive LCD panel 103 changes from the initial state shown in FIG. 5 (a) to the state shown in FIG. 5 (b).

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. 5 (c). 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 page of the map book 105, the user can reset the preset position 106 by pressing the reset key 203 shown in FIG. 2 provided on the front panel of the GPS receiver 101. In addition, the scale up key 204 and the scale down key 205 shown in FIG. 2 provided on the front panel of the GPS receiver 101 can be operated to arbitrarily change the scale of the map book 105 to be used. it can.

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 position) 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-described reduced scale input by the user in the work RAM (not shown) and the preset position 1 input by the user.
06 (FIG. 1) is stored in the preset position storage unit 610 which is a work RAM, the latitude / longitude data of the reception point calculated by the position calculation unit 608, and the preset position 106 stored in the preset position storage unit 610. Dot 10 on the transmissive LCD panel 103 based on the information of
The operation of calculating the display position of 4 is performed. Further, the reduced scale display processing unit 611 causes the LCD 102 (FIG. 1) to display the reduced scale calculated by the display position calculation unit 609 based on the input operation by the user. Further, the transmissive display processing unit 612 is
A preset position 106 is displayed on the transmissive LCD panel 103.
And a dot 104 corresponding to the latitude / longitude data of the receiving point
Is displayed.

Here, the data processing unit 602, for example,
The work RAM that the microcomputer contains
ROM used as a work area while using it
It is realized as a function of executing the control program stored in.

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 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 and 8. First, in each process of the operation flowcharts of FIGS. 7 and 8, the step of FIG. 7 for calculating the latitude / longitude data of the receiving point (current position) based on the C / A code received by the receiving unit 601. S709 to step S714 in FIG.
The process will be described.

In step S709, 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 S710, the operation of holding the display of the transmissive LCD panel 103 in FIG. 1 is executed, and then step S709 is executed again.

If the determination in step S709 is YES, then in step S711 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 S712 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 S711.
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 S713 corresponds to the function of the distance measuring unit 607 of FIG. Here, first, the four types of GPS stored in the work RAM in step S711.
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 S714 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.

[0041]

[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.

[0042]

## 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.

[0043]

(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 formula 3, the pseudo distance di (1 ≦ i ≦ 4) is calculated in step S713, and the current position (θi, ψi, ri) (1) of the four types of GPS satellites Si is calculated. ≦ i ≦ 4)
Are extracted as orbital data in step S712. 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 S714, 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 and 8 will be described. First, step S701
Corresponds to the function of the display position calculation unit 609 in FIG. Here, the contents of the work RAM (not shown) in the data processing unit 602 are initialized.

Next, step S702 corresponds to the functions of the display position calculation unit 609 and the reduced scale display processing unit 611 of FIG. Here, it is determined whether or not the user has operated the scale up key 204 and the scale down key 205 (FIG. 2) to set the scale of the map book 105 to be used. In addition,
In this case, the reduced scale display on the LCD 102 is also changed.
After the user performs this operation, the preset key 202
When (FIG. 2) is pressed, the determination in step S702 is YES.

Further, step S703 also corresponds to the function of the reduced scale display processing unit 611 shown in FIG. Here, the scale data corresponding to the input scale is stored in a work RAM (not shown).

Next, step S704 corresponds to the functions of the display position calculation unit 609 and the transmissive display processing unit 612 of FIG. Here, for example, as shown in the initial state of FIG. 5A, the preset position 106 is displayed in the center of the transmissive LCD panel 103 (FIG. 1).

Thereafter, until it is determined in step S707 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 processing of 05 is repeatedly executed. Step S705 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 05 is YES, and in step S706, 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 706 corresponds to the functions of the display position calculation unit 609 and the transmissive display processing unit 612 in FIG.

After that, the process returns to the determination process of step S705 again. If the user presses the preset key 202, the determination in step S707 becomes YES, and step S708
Then, the preset flag stored in the work RAM is set. Step S708 corresponds to the function of the display position calculation unit 609 of FIG.

Then, based on the C / A code from the GPS satellite Si (1≤i≤4), the above-mentioned step S70 is performed.
9 through S714, the above-mentioned preset position 10
Latitude / longitude data of the reception point (current location) corresponding to 6 is calculated.

Next, steps S715 to S718 of FIG.
Corresponds to the function of the display position calculation unit 609 in FIG. First, in step S715, it is determined whether or not the preset flag stored in the work RAM is set.

Immediately after the preset operation is performed by the user, since the preset flag is set in step S708, the determination in step S715 is YES. As a result, in step S716, the preset position 1
The display position on the transmissive LCD panel 103 corresponding to 06 and the latitude / longitude data of the preset position 106 calculated in the processing of steps S709 to S714 are stored in the work RAM area corresponding to the preset position storage unit 610 of FIG. Memorized in.

Then, in step S717, the preset flag is reset. After that, unless the user performs the preset operation again, the preset flag remains reset, so the determination in step S715 is N.
It becomes O, and steps S716 and S717 are skipped.

Then, each time the C / A code is received from the GPS satellite Si (1≤i≤4), the above-mentioned step S is performed.
709 to S714 and step S7 described below.
The processing of 18 to S723 is repeatedly executed, and the dot 104 corresponding to the reception point (current position) is displayed on the transmissive LCD panel 1.
03 is displayed.

That is, in step S718, step S
Latitude / longitude data of the reception point calculated in the processing of steps 709 to S714 and stored in the work RAM, and the work RAM
Latitude corresponding to the preset position 106 stored in
Using the longitude data, the display position data 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 receiving point (current position) on the transmissive LCD panel 103. Is calculated. Then, this calculated position is the transmissive LCD panel 1
It is determined whether or not it is within the range of 03.

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, after the preset position 106 and the display of the dot 104 on the transmissive LCD panel 103 are erased, the process jumps to the process of step S704 to operate the user to input the preset position 106 again. Step S722 corresponds to the function of the transmissive display processing unit 612 in FIG.

If the determination in step S721 is NO, it is determined in step S723 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 S723 corresponds to the function of the display position calculation unit 609 of FIG.

If this determination is YES, step S
At 724, the scale data corresponding to the scale changed by the user is stored in the work RAM, which is not particularly shown, and the changed scale is displayed on the LCD 102. Step S724 is the display position calculation unit 609 of FIG.
And the function of the scale display processing unit 611.

Then, the process jumps to step S718, and the position of the new dot 104 is recalculated according to the changed scale. If the determination in step S723 is no, the process jumps to step S709 in FIG. 7 and the next C / A code is received from the GPS satellite Si (1 ≦ i ≦ 4), so that steps S709 to S71 are performed.
4 and the processing of steps S718 to S723 are repeatedly executed, and the dot 10 corresponding to the reception point (current position) is
4 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 with 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 above-described embodiment, the current position is calculated based on the radio waves from the GPS satellites. However, the current position is, 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.

[0067]

According to the present invention, by inputting the scale and the preset position to the map book to be used, it becomes possible to accurately recognize the position information using a commercially available map book. .

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. 101 GPS receiver 102 LCD 103 Transmissive LCD panel 104 Dot 105 Atlas 106 Preset position 201 Cursor key 202 Preset key 203 Reset key 204 Scale up key 205 Scale down key 601 Receiver 602 Data processor 603 High frequency amplification circuit 604 Frequency conversion / Amplification circuit 605 Spectrum despreading / demodulation circuit 606 Orbital data collection unit 607 Distance measurement unit 608 Position calculation unit 609 Display position calculation unit 610 Preset position storage unit 611 Scale display processing unit 612 Transparent 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 the map book. Preset position designating means for designating the current position as a preset position on the transmissive display means that are placed on top of each other, and a display position on the transmissive display means corresponding to the preset position designated by the preset position designating means. And the position information calculated by the position information calculating unit corresponding to the preset position at the time of designation as preset position information, and the position information calculating unit sequentially calculates the position information. The calculated position information to the transmissive display means based on the position information stored and the preset position information. Map guide apparatus characterized by comprising display control means for performing display instruction to the display position of, a. 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.